Einloggen

Thematische Bibliographien / Tpyp / Zeitschriftenartikel

Um die anderen Arten von Veröffentlichungen zu diesem Thema anzuzeigen, folgen Sie diesem Link: Tpyp.

Zeitschriftenartikel zum Thema „Tpyp“

Autor: Grafiati

Veröffentlicht am 1. April 2023

Geben Sie eine Quelle nach APA, MLA, Chicago, Harvard und anderen Zitierweisen an

Wählen Sie eine Art der Quelle aus:

Machen Sie sich mit Top-50 Zeitschriftenartikel für die Forschung zum Thema "Tpyp" bekannt.

Neben jedem Werk im Literaturverzeichnis ist die Option "Zur Bibliographie hinzufügen" verfügbar. Nutzen Sie sie, wird Ihre bibliographische Angabe des gewählten Werkes nach der nötigen Zitierweise (APA, MLA, Harvard, Chicago, Vancouver usw.) automatisch gestaltet.

Sie können auch den vollen Text der wissenschaftlichen Publikation im PDF-Format herunterladen und eine Online-Annotation der Arbeit lesen, wenn die relevanten Parameter in den Metadaten verfügbar sind.

Sehen Sie die Zeitschriftenartikel für verschiedene Spezialgebieten durch und erstellen Sie Ihre Bibliographie auf korrekte Weise.

1

Langford, Steven J., und Clint P. Woodward. „Six-Sided Heptaporphyrin Array: Towards a Nano-Sized Cube“. Collection of Czechoslovak Chemical Communications 69, Nr. 5 (2004): 996–1008. http://dx.doi.org/10.1135/cccc20040996.

Der volle Inhalt der Quelle

Annotation:

A strategy in preparing a family of hexameric porphyrin cubes based on the interplay of Sn(IV)-O and Ru(II)-N interactions is described. In this first iteration, we have prepared the heptamer [SnIV(TPyP)·(4)2][Ru(CO)(TPP)]6 (4 = (E)-(3-(4-pyridyl)acrylate)) constituting a 5,10,15,20-tetra(4-pyridyl)porphyrin (TPyP) core and 5,10,15,20-tetraphenylporphyrin (TPP) faces and compared its formation by stepwise and "one-pot" strategies where up to nine components are assembled in a single step in a regiospecific manner. In one example, the heptamer is formed around the template [SnIV(TPyP)·(4)2] bearing pyridine groups in which the nitrogens radiate octahedrally along each vertex. The ability to modulate the axial vertex through choice of pyridine is also demonstrated. 1H NMR measurements on [SnIV(TPyP)·(4)2][Ru(CO)(TPP)]6 indicate that the protons on the core template are extremely shielded as a result of the anisotropy of the peripheral porphyrin units. Various NMR techniques, including NOESY experiments, have been used to characterise the heptamer in solution.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

2

Kumar, R. Krishna, und Israel Goldberg. „Supramolekulare Aggregate heterogener Multiporphyrinanordnungen – die Strukturen von [{ZnII(tpp)}2(tpyp)] und dem Koordinationspolymer [{[MnIII(tpp)]2(tpyp)(ClO4)2}∞]“. Angewandte Chemie 110, Nr. 21 (02.11.1998): 3176–80. http://dx.doi.org/10.1002/(sici)1521-3757(19981102)110:21<3176::aid-ange3176>3.0.co;2-i.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

3

Kumar, R. Krishna, und Israel Goldberg. „Supramolecular Assembly of Heterogeneous Multiporphyrin Arrays—Structures of [{ZnII(tpp)}2(tpyp)] and the Coordination Polymer [{[MnIII(tpp)]2(tpyp)(ClO4)2}∞]“. Angewandte Chemie International Edition 37, Nr. 21 (16.11.1998): 3027–30. http://dx.doi.org/10.1002/(sici)1521-3773(19981116)37:21<3027::aid-anie3027>3.0.co;2-n.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

4

Kitaoka, Satoshi, Kaoru Nobuoka, Keita Ihara und Yuichi Ishikawa. „A simple method for efficient synthesis of tetrapyridyl-porphyrin using Adler method in acidic ionic liquids“. RSC Adv. 4, Nr. 51 (2014): 26777–82. http://dx.doi.org/10.1039/c4ra02522a.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

5

Rad, A. Molaei, A. Akbar Moosavi-Movahedi, Hedayatollah Ghourchian, Nasser Safari, Jun Hong, Zinab Moosavi-Movahedi, Khodadad Nazari, A. Akbar Saboury und P. Rajabali Jamaat. „Effects of substituted metal-free porphyrins in apo-horseradish peroxidase“. Journal of Porphyrins and Phthalocyanines 11, Nr. 12 (Dezember 2007): 836–45. http://dx.doi.org/10.1142/s1088424607000965.

Der volle Inhalt der Quelle

Annotation:

The peroxidase-like catalytic activities of some synthetic porphyrins following substitution in apo-horseradish peroxidase (apo-HRP) were studied by UV-vis and fluorescence spectrophotometries in buffer potassium phosphate solution at pH 7. The insertion of these synthetic porphyrins in apo-HRP is very difficult, due to steric hindrances between coordinated metals in porphyrins and the side-chains of amino acids in native protein. However, because of planar coordination following insertion in an active site of apo-HRP tetrapyridylporphyrin(TPyP), a metal-free porphyrin, adsorbs free metal ions from the environment and shows higher peroxidase-like catalytic activity than other new synthetic porphyrins. The results indicate that the metal-free porphyrins with optimum Reinheitzahl (RZ) show higher catalytic activity relative to others. The fluorescence emission of TPyP only, and of apo-HRP-TPyP, displayed significantly different wavelengths for the maximum aromatic fluorescence intensity. The λmax for apo-HRP-TPyP was around 447 nm, while for TPyP, alone, it increased to 463 nm, which showed that the aromatic groups' surroundings changed upon substitution of porphyrins in a low polar environment.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

6

Takamura, Kiyoko, und Takatoshi Matsumoto. „Ultraviolet—Visible Spectral Analysis for the Reaction of Hydrogen Peroxide with a Titanium(IV)-Porphyrin Reagent“. Applied Spectroscopy 63, Nr. 5 (Mai 2009): 579–84. http://dx.doi.org/10.1366/000370209788346968.

Der volle Inhalt der Quelle

Annotation:

A Ti-TPyP reagent, i.e., an acidic aqueous solution of oxo[5,10,15,20-tetra(4-pyridyl)porphyrinato]titanium(IV) complex, TiO(tpyp), was developed as a highly sensitive and selective spectrophotometric reagent for the determination of traces of hydrogen peroxide. The reagent exhibited a single absorption peak at 432 nm, and the addition of hydrogen peroxide to the reagent gave rise to a new peak at 450 nm, with height being proportional to the added hydrogen peroxide concentration. Recently we succeeded in clarifying the reaction specificity of the TiO(tpyp) complex to hydrogen peroxide from the viewpoint of the reaction mechanisms and molecular orbitals based on ab initio calculations. In the present study, we performed ultraviolet–visible (UV-Vis) spectral simulations for individual species in the proposed reaction mechanisms based on the theoretical calculations carried out using the Zerner's intermediate neglect of differential overlap (ZINDO) method, since the assignment of the observed absorption peaks to the respective reaction species is important to confirm the reliability of the analysis of hydrogen peroxide using the Ti-TPyP reagent. The absorption peaks at 432 nm and 450 nm were assigned to a H2O-adduct structure of the protonated TiO(tpyp) complex and the important structure corresponding to the monoperoxo TiO(tpyp) complex, respectively, under acidic conditions. Particularly, it should be noted that the addition of water molecules to the protonated TiO(tpyp) complex affects the maximum absorption wavelength appreciably. Taking the addition of water molecules to the complex into consideration, the reaction mechanism proposed previously was revised in this study. The results should contribute to providing a new way to evaluate analytical reagents.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

7

JIANG, JIANZHUANG, JINGLEI XIE, MICHAEL T. M. CHOI, YAN YAN, SIXIU SUN und DENNIS K. P. NG. „Double-decker Yttrium(III) Complexes with Phthalocyaninato and Porphyrinato Ligands“. Journal of Porphyrins and Phthalocyanines 03, Nr. 04 (April 1999): 322–28. http://dx.doi.org/10.1002/(sici)1099-1409(199904)3:4<322::aid-jpp137>3.0.co;2-6.

Der volle Inhalt der Quelle

Annotation:

A series of new yttrium(III) double-decker complexes with the same and different phthalocyaninato and porphyrinato ligands has been prepared. The homoleptic complexes Y ( P )2 ( P = Pc *(C7 H 15)8, Pc *( OC 5 H 11)8; Pc * = 2,3,9,10,16,17,23,24-octasubstituted phthalocyaninate) have been synthesized by treating yttrium(III) acetylacetonate ( Y ( acac )3· H 2 O ) with the phthalonitriles C 6 H 2 R 2( CN )2 ( R = C 7 H 15, OC 5 H 11) in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU). The heteroleptic analogues Y ( P )( Pc ) ( P = Pc *( C 7 H 15)8, Pc *( OC 5 H 11)8; Pc = unsubstituted phthalocyaninate) and Y ( P )( Por ) ( P = Pc , Pc *( C 7 H 15)8; Por = meso-tetraphenylporphyrinate (TPP), meso-tetra(4-pyridyl)porphyrinate (TPyP)) have been prepared by the base-catalysed tetramerization of the corresponding phthalonitriles using Y ( P )( acac ) ( P = Pc , TPP , TPyP ) as templates. The syntheses along with the spectroscopic and electrochemical properties of these novel double-deckers are described.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

8

Chaves, Otávio Augusto, Bernardo A. Iglesias und Carlos Serpa. „Biophysical Characterization of the Interaction between a Transport Human Plasma Protein and the 5,10,15,20-Tetra(pyridine-4-yl)porphyrin“. Molecules 27, Nr. 16 (22.08.2022): 5341. http://dx.doi.org/10.3390/molecules27165341.

Der volle Inhalt der Quelle

Annotation:

The interaction between human serum albumin (HSA) and the non-charged synthetic photosensitizer 5,10,15,20-tetra(pyridine-4-yl)porphyrin (4-TPyP) was evaluated by in vitro assays under physiological conditions using spectroscopic techniques (UV-vis, circular dichroism, steady-state, time-resolved, synchronous, and 3D-fluorescence) combined with in silico calculations by molecular docking. The UV-vis and steady-state fluorescence parameters indicated a ground-state association between HSA and 4-TPyP and the absence of any dynamic fluorescence quenching was confirmed by the same average fluorescence lifetime for HSA without (4.76 ± 0.11 ns) and with 4-TPyP (4.79 ± 0.14 ns). Therefore, the Stern–Volmer quenching (KSV) constant reflects the binding affinity, indicating a moderate interaction (104 M−1) being spontaneous (ΔG°= -25.0 kJ/mol at 296 K), enthalpically (ΔH° = -9.31 ± 1.34 kJ/mol), and entropically (ΔS° = 52.9 ± 4.4 J/molK) driven. Binding causes only a very weak perturbation on the secondary structure of albumin. There is just one main binding site in HSA for 4-TPyP (n ≈ 1.0), probably into the subdomain IIA (site I), where the Trp-214 residue can be found. The microenvironment around this fluorophore seems not to be perturbed even with 4-TPyP interacting via hydrogen bonding and van der Waals forces with the amino acid residues in the subdomain IIA.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

9

Abdullah, Kiran, Yanli Chen und Jianzhuang Jiang. „Synthesis, fabrication of self-assembled film and ambipolar chemical sensing properties of triple-decker (phthalocyaninato) (porphyrinato) europium complex“. Journal of Porphyrins and Phthalocyanines 21, Nr. 12 (Dezember 2017): 893–99. http://dx.doi.org/10.1142/s1088424617500985.

Der volle Inhalt der Quelle

Annotation:

A mixed (phthalocyaninato) (porphyrinato) europium triple-decker complex, named (TPyP)Eu[Formula: see text][Pc(OC[Formula: see text]H[Formula: see text]][Formula: see text][TPyP [Formula: see text] dianion of 5,10,15,20-tetra(4-tert-pyridyl) porphyrin, Pc(OC[Formula: see text]H[Formula: see text] 2,3,9,10,16,17,23,24-octabutoxyphthalocyaninate] is synthesized and characterized by MALDI-TOF, 1HNMR, UV-visible spectra and differential pulse voltammetry techniques. Introduction of electron-donating butoxy groups at the periphery of the phthalocyanine ligands and electron-withdrawing pyridyl substituents onto the meso-positions of the porphyrin ring not only increases the solubility of the triple decker but successfully tunes the HOMO and LUMO energy levels into a soluble ambipolar organic semiconductor. A simple quasi-Langmuir–Shäfer (QLS) method is used to fabricate self-assembled film of (TPyP)Eu[Formula: see text][Pc(OC[Formula: see text]H[Formula: see text]][Formula: see text]. Excellent sensitivity, reproducible [Formula: see text]-type and [Formula: see text]-type responses to electron-accepting gas NO[Formula: see text] and electron-donating gas NH[Formula: see text] are found for the films of (TPyP)Eu[Formula: see text][Pc(OC[Formula: see text]H[Formula: see text]][Formula: see text]complex at room temperature. The detection limit towards NO[Formula: see text] and NH[Formula: see text] is as low as 0.4 ppm and 1 ppm, respectively, with percentage current change of 4.2% and 1.6%, depending on the uniform molecular packing and intermolecular interactions among the triple decker molecules. The present results represent not only the excellent example of ambipolar triple-decker phthalocyanine-based sensors obtained by a solution-based method, but more importantly provide a new strategy for the molecular design to obtain soluble ambipolar organic semiconductors in sensing device fabrication.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

10

Jou, Jeng-Yi, Chih-Hao Chang, Gene-Hsiang Lee, Yu Wang, Y. Oliver Su, Wei-Lun Yeh und Shu-Hua Cheng. „Electrochemical and resonance Raman studies of nitridomanganese(V) porphyrins in nonaqueous solution“. Journal of Porphyrins and Phthalocyanines 07, Nr. 10 (Oktober 2003): 674–81. http://dx.doi.org/10.1142/s1088424603000847.

Der volle Inhalt der Quelle

Annotation:

The UV-vis spectral, electrochemical and resonance Raman data of [meso-tetrakis(4-pyridyl)porphyrinato]nitridomanganese(V), MnN(TPyP) , were investigated. MnN(TTP) (where ( TTP )2− = dianion of meso-tetrakis(p-tolyl)porphyrin) and MnN(OEP) (where ( OEP )2− = dianion of 2,3,7,8,12,13,17,18-octaethylporphyrin) were also examined in comparison. Cyclic voltammetry of MnN ( TPyP ) showed an irreversible oxidation wave at +1.22 V and two redox couples at −1.05 and −1.40 V vs. Ag / AgCl , respectively. According to spectroelectrochemical studies, the first and the second reductions involved formation of the porphyrin anion and dianion, respectively, the latter leading to a phlorin. The electron-withdrawing 4-pyridyl substituent shifted the redox potential of the porphyrin ring to a more positive value. However, the bond strength of the Mn - N triple bond was not affected. Resonance Raman studies indicated that the Mn≡N stretching frequencies (νMnN) occurring within 1050 ± 1 cm−1 in various solvents did not change significantly. The hydrogen-bonding between methanol and MnN ( TPyP ) lowered νMnN to 1040 cm−1. A further lowering of νMnN was found in the presence of nitrogeneous bases such as imidazole (ImH), piperidine (Pip) and pyridine (Py) and may be due to coordination to the manganese center. νMnN is correlated with the pKa's of a series of pyridines.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

11

Carbone, A., A. Saccà, R. Pedicini, I. Gatto, E. Passalacqua, A. Romeo, L. Monsù Scolaro und M. A. Castriciano. „Composite sPEEK-TPyP membranes development for portable applications“. International Journal of Hydrogen Energy 40, Nr. 48 (Dezember 2015): 17394–401. http://dx.doi.org/10.1016/j.ijhydene.2015.07.159.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

12

Xu, Peng, Mehran Azeem, Muhammad Mubashir Izhar, Syed Mazhar Shah, Muhammad Ahsan Binyamin und Adnan Aslam. „On Topological Descriptors of Certain Metal-Organic Frameworks“. Journal of Chemistry 2020 (12.11.2020): 1–12. http://dx.doi.org/10.1155/2020/8819008.

Der volle Inhalt der Quelle

Annotation:

Topological indices are numerical numbers that represent the topology of a molecule and are calculated from the graphical depiction of the molecule. The importance of topological indices is due to their use as descriptors in QSPR/QSAR modeling. QSPRs (quantitative structure-property relationships) and QSARs (quantitative structure-activity relationships) are mathematical correlations between a specified molecular property or biological activity and one or more physicochemical and/or molecular structural properties. In this paper, we give explicit expressions of some degree-based topological indices of two classes of metal-organic frameworks (MOFs), namely, butylated hydroxytoluene- (BHT-) based metal-organic ( M = Co , Fe, Mn, Cr) (MBHT) frameworks and M 1 TPyP − M 2 (TPyP = 5,10,15,20 -tetrakis(4-pyridyl)porphyrin and M 1 , M 2 = Fe and Co) MOFs.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

13

Stanculescu, Anca, Marcela Socol, Oana Rasoga, Carmen Breazu, Nicoleta Preda, Florin Stanculescu, Gabriel Socol, Loredana Vacareanu, Mihaela Girtan und Aleksandr S. Doroshkevich. „Arylenevinylene Oligomer-Based Heterostructures on Flexible AZO Electrodes“. Materials 14, Nr. 24 (13.12.2021): 7688. http://dx.doi.org/10.3390/ma14247688.

Der volle Inhalt der Quelle

Annotation:

We investigated the optical and electrical properties of flexible single and bi-layer organic heterostructures prepared by vacuum evaporation with a p-type layer of arylenevinylene oligomers, based on carbazole, 3,3′ bis(N hexylcarbazole)vinylbenzene = L13, or triphenylamine, 1,4 bis [4 (N,N’ diphenylamino)phenylvinyl] benzene = L78, and an n-type layer of 5,10,15,20-tetra(4-pyrydil)21H,23H-porphyne = TPyP. Transparent conductor films of Al-doped ZnO (AZO) with high transparency, >90% for wavelengths > 400 nm, and low resistivity, between 6.9 × 10−4 Ω·cm and 23 × 10−4 Ω·cm, were deposited by pulsed laser deposition on flexible substrates of polyethylene terephthalate (PET). The properties of the heterostructures based on oligomers and zinc phthalocyanine (ZnPc) were compared, emphasizing the effect of the surface morphology. The measurements revealed a good absorption in the visible range of the PET/AZO/arylenevinylene oligomer/TPyP heterostructures and a typical injection contact behavior with linear (ZnPc, L78) or non-linear (L13) J-V characteristics in the dark, at voltages < 0.4 V. The heterostructure PET/AZO/L78/TPyP/Al showed a current density of ~1 mA/cm2 at a voltage of 0.3 V. The correlation between the roughness exponent, evaluated from the height-height correlation function, grain shape, and electrical behavior was analyzed. Consequently, the oligomer based on triphenylamine could be a promising replacement of donor ZnPc in flexible electronic applications.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

14

Zhang, Yifeng, Hanbing Yan, Xuefeng Wang, Zhenyu Zhang, Fengchun Liu, Shan Tu und Xiufang Chen. „Highly efficient solar-absorber composite material based on tetrapyridylporphyrin for water evaporation and thermoelectric power generation“. RSC Advances 12, Nr. 45 (2022): 28997–9002. http://dx.doi.org/10.1039/d2ra03512j.

Der volle Inhalt der Quelle

Annotation:

Photothermal conversion materials based on tetrapyridylporphyrin (TPyP) were studied and were found to possess a polypyrrole macrocyclic framework (18π electrons), which makes them exhibit strong absorption in the 300–800 nm region and high photothermal conversion.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

15

Zhang, Xiaoyu, Yuyang Liu, Xin Wang, Yinxiu Liang und Lei Yan. „Metallo-supramolecular complexes from mPEG/PDPA diblock copolymers and their self-assembled strip nanosheets“. RSC Advances 10, Nr. 16 (2020): 9686–92. http://dx.doi.org/10.1039/d0ra00431f.

Der volle Inhalt der Quelle

Annotation:

Copolymers mPEG(-b-Tpyp)₂-b-PDPA_x were synthesized. After a hierarchical pattern from the coordination of the copolymers with Ru(ii) ions followed by the self-assembly in water, 2D strip nanosheets were obtained.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

16

Wenceslau, Adriana C., Guilherme L. Q. C. Ferreira, Noboru Hioka und Wilker Caetano. „Spectroscopic studies of pyridil and methoxyphenyl porphyrins in homogeneous and Pluronic®-based nanostructured systems“. Journal of Porphyrins and Phthalocyanines 19, Nr. 11 (November 2015): 1168–76. http://dx.doi.org/10.1142/s1088424615500996.

Der volle Inhalt der Quelle

Annotation:

Spectroscopic properties of Porphyrins TPyP (tetra(4-pyridil)porphyrin), TMPP (tetrakis(4-methoxypheny) porphyrin) and its zinc metaled derivatives porphyrins Zn-TPyP and Zn-TMPP respectively, were studied in homogeneous and micro heterogeneous systems, comprising nanostructured Pluronic® copolymeric micellar systems, as a promising drug delivery systems for the porphyrins investigated. Physico-chemical properties such as, hydrophobicity degree, self- aggregation in solvents of different polarities and water/ethanol mixtures (monofasic binary), as well as kinetics profile and isotherm binding, molecular organization, [Formula: see text] and relative localization in neutral micellar systems. The hydrophobic character was the key to relative drug location in the micellar systems. In homogenous solvents systems the porphyrins presented relatively high values of molar absorptivity and low values of [Formula: see text]. The K[Formula: see text] values obtained are modulated by the structure of porphyrins, state of aggregation, as well as, structure and macro molecular self-organization of copolymers. Fluorescence quenching studies have shown that porphyrins in F-127 are located in a less hydrophobic region than the porphyrins in P-123, which are located preferentially in a deeper micellar microenvironment. The zinc porphyrins showed high values of K[Formula: see text]. Thus, the association of the porphyrins with specific binding sites of micellar systems is strongly modulated by the presence of the metal coordinated to the porphyrinic ring.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

17

Neto, Newton M. Barbosa, Leonardo De Boni, José J. Rodrigues, Lino Misoguti, Cléber R. Mendonça, Luis R. Dinelli, Alzir A. Batista und Sérgio C. Zilio. „Dynamic saturable optical nonlinearities in free base tetrapyridylporphyrin“. Journal of Porphyrins and Phthalocyanines 07, Nr. 06 (Juni 2003): 452–56. http://dx.doi.org/10.1142/s1088424603000586.

Der volle Inhalt der Quelle

Annotation:

Dynamic optical nonlinearities in free base tetrapyridylporphyrin ( H 2 TPyP ) solutions were investigated at 532 nm with the Z-scan technique. We observed a reverse saturable absorption process that was found to have a fast contribution related to the singlet population and a slow accumulative contribution arising from the triplet population. The optical excitations and subsequent relaxations can be interpreted with a five-energy-level diagram that allows determination of the excited states photophysical parameters such as triplet and singlet absorption cross-sections and the intersystem crossing time.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

18

Tang, Suh-Shing, Yun-Huin Lin, Ming-Torng Sheu, Chu-Chieh Lin, Jyh-Horung Chen und Shin-Shin Wang. „Molecular structure of meso-tetra(4-pyridyl) porphyrinatothallium(III) acetate, Tl(tpyp)(OAc)“. Polyhedron 14, Nr. 9 (Mai 1995): 1241–43. http://dx.doi.org/10.1016/0277-5387(94)00370-t.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

19

Socol, Marcela, Nicoleta Preda, Carmen Breazu, Andreea Costas, Oana Rasoga, Gabriela Petre, Gianina Popescu-Pelin et al. „Macrocyclic Compounds: Metal Oxide Particles Nanocomposite Thin Films Deposited by MAPLE“. Materials 16, Nr. 6 (21.03.2023): 2480. http://dx.doi.org/10.3390/ma16062480.

Der volle Inhalt der Quelle

Annotation:

Nanocomposite films based on macrocyclic compounds (zinc phthalocyanine (ZnPc) and 5,10,15,20-tetra(4-pyridyl) 21H,23H-porphyrin (TPyP)) and metal oxide nanoparticles (ZnO or CuO) were deposited by matrix-assisted pulsed laser evaporation (MAPLE). 1,4-dioxane was used as a solvent in the preparation of MAPLE targets that favor the deposition of films with a low roughness, which is a key feature for their integration in structures for optoelectronic applications. The influence of the addition of ZnO nanoparticles (~20 nm in size) or CuO nanoparticles (~5 nm in size) in the ZnPc:TPyP mixture and the impact of the added metal oxide amount on the properties of the obtained composite films were evaluated in comparison to a reference layer based only on an organic blend. Thus, in the case of nanocomposite films, the vibrational fingerprints of both organic compounds were identified in the infrared spectra, their specific strong absorption bands were observed in the UV–Vis spectra, and a quenching of the TPyP emission band was visible in the photoluminescence spectra. The morphological analysis evidenced agglomerated particles on the composite film surface, but their presence has no significant impact on the roughness of the MAPLE deposited layers. The current density–voltage (J-V) characteristics of the structures based on the nanocomposite films deposited by MAPLE revealed the critical role played by the layer composition and component ratio, an improvement in the electrical parameters values being achieved only for the films with a certain type and optimum amount of metal oxide nanoparticles.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

20

Antohe, S., L. Tugulea, V. Gheorghe, V. Ruxandra, I. Caplanus und L. Ion. „Electrical and photovoltaic properties of ITO/chlorophyll a/TPyP/Al p–n junction cells“. Physica Status Solidi (a) 153, Nr. 2 (16.02.1996): 581–88. http://dx.doi.org/10.1002/pssa.2211530234.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

21

Chu, Yu-Ming, Muhammad Abid, Muhammad Imran Qureshi, Asfand Fahad und Adnan Aslam. „Irregular topological indices of certain metal organic frameworks“. Main Group Metal Chemistry 44, Nr. 1 (01.01.2021): 73–81. http://dx.doi.org/10.1515/mgmc-2021-0009.

Der volle Inhalt der Quelle

Annotation:

Abstract It is interesting to study the molecular topology that provides a base for relationship of physicochemical property of a definite molecule. The topology of a molecule and the irregularity of the structure plays a vital character in shaping properties of the structure like enthalpy and entropy. In this article, we are interested to calculate some irregular topological indices of two classes of metal organic frameworks (MOFs) namely BHT (Butylated hydroxytoluene) based metal (M = Co, Fe, Mn, Cr) organic frameworks (MBHT) and M1TPyP-M2 (TPyP = 5, 10, 15, 20-tetrakis (4-pyridyl) porphyrin and M1, M2, = Fe and Co) MOFs. Also we compare our results graphically.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

22

Venkateswarlu, Katta, und Kanusu Rao. „PdII-Porphyrin Complexes – the First Use as Safer and Efficient Catalysts for Miyaura Borylation“. Synlett 29, Nr. 08 (16.03.2018): 1055–60. http://dx.doi.org/10.1055/s-0036-1591549.

Der volle Inhalt der Quelle

Annotation:

We have developed a simple and convenient procedure for the preparation of pinacol arylboronates from aryl/heteroaryl bromides and bis(pinacolato)diborane using a PdII-porphyrin complex as a catalyst. Seven different PdII-porphyrin complexes (PdII-TmHPP, PdII-TmCPP, PdII-TPP, PdII-TSTpSPP, PdII-TpCPP, PdII-TpTP, and PdII-TpAP) have been synthesized and investigated for their catalytic influence in the Miyaura borylation.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

23

Antohe, S., L. Ion, N. Tomozeiu, T. Stoica und E. Barna. „Electrical and photovoltaic properties of photosensitised ITO/a-Si:H p–i–n/TPyP/Au cells“. Solar Energy Materials and Solar Cells 62, Nr. 3 (Mai 2000): 207–16. http://dx.doi.org/10.1016/s0927-0248(99)00127-0.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

24

Cheng, Tun-Wen, Yao-Jung Chen, Fung-E. Hong, Jyh-Horung Chen, Sue-Lein Wang und Lian-Pin Hwang. „Synthesis and molecular structure of meso-tetra(4-pyridyl) porphyrinatothallium(III) cyanide: Tl(tpyp)(CN)“. Polyhedron 13, Nr. 3 (Januar 1994): 403–8. http://dx.doi.org/10.1016/s0277-5387(00)81653-8.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

25

Tang, Suh-Shing, I.-Chih Liu, Chu-Chieh Lin, Jyh-Horung Chen und Shin-Shin Wang. „Synthesis and molecular structure of chloro-meso-tetra(4-pyridyl) porphyrinatothallium(III), Tl(tpyp)(Cl)“. Polyhedron 15, Nr. 1 (Januar 1996): 37–41. http://dx.doi.org/10.1016/0277-5387(95)00238-n.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

26

Rosary, Maria Singaraj, und Samuel Asefa Fufa. „On Reverse Valency Based Topological Characterization of a Chemical Compound“. Journal of Mathematics 2022 (11.08.2022): 1–17. http://dx.doi.org/10.1155/2022/5424430.

Der volle Inhalt der Quelle

Annotation:

Metal-organic frameworks explicit the consequence of these frameworks with adjustable implementations, namely, energy storage gadgets of magnificent electrode materials, gas store, heterogeneous catalysis, environmental hazard, estimation of chemicals, recognizing of definite gases, controlling solids, and supercapacitors. In this paper, we give explicit expression of the reverse general Randic index, the reverse atom bond connectivity index, the reverse geometric arithmetic index, the reverse forgotten index, the reverse Balaban index, the reverse augmented index, and different types of reverse Zagreb indices of the metal-organic framework M1TPyP-M2 (TPyP = 5, 10, 15, 20-tetrakis (4-pyridyl) porphyrin and M1, M2 = Fe and Co). A graphical comparison of the calculated different types of the reverse degree based topological indices with the aid of the numerical values is also included.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

27

Jiang, Jianzhuang, Ken-ichi Machida und Gin-ya Adachi. „Synthesis and characterization of water-soluble rare earth porphyrins Ce(tpyp)2 and Ce(tmpyp)2“. Journal of Alloys and Compounds 192, Nr. 1-2 (Februar 1993): 296–99. http://dx.doi.org/10.1016/0925-8388(93)90254-k.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

28

Liu, Hong-Guo, Xu-Sheng Feng, Li-Juan Zhang, Jianzhuang Jiang, Yong-Ill Lee, Ki-Wan Jang, Dong-Jin Qian und Kong-Zhang Yang. „Supramolecular assemblies of Eu(TPyP)Pc at the air/water and air/Cd2+ aqueous solution interfaces“. Materials Letters 57, Nr. 15 (April 2003): 2156–61. http://dx.doi.org/10.1016/s0167-577x(02)01166-7.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

29

Tangestaninejad, Shahram, Majid Moghadam, Valiollah Mirkhani und Hadi Kargar. „Efficient and selective hydrocarbon oxidation with sodium periodate under ultrasonic irradiation catalyzed by polystyrene-bound Mn (TPyP)“. Ultrasonics Sonochemistry 13, Nr. 1 (Januar 2006): 32–36. http://dx.doi.org/10.1016/j.ultsonch.2004.12.005.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

30

Zhang, Xia, Lihong Liu, Jiaqi Xiao, Zhou Sun und Ping Li. „Organic (TPyP)Eu2[Pc(OPh)8]2/CdS self-assembled hybrid nano-transistors with high ambipolar performance“. Journal of Materials Research and Technology 9, Nr. 6 (November 2020): 13682–91. http://dx.doi.org/10.1016/j.jmrt.2020.09.096.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

31

Fuh, Jeou-Jen, Suh-Shing Tang, Yun-Huin Lin, Jyh-Horun Chen, Tung-Sheng Liu, Shin-Shin Wang und Jing-Chie Lin. „Synthesis, characterization and dynamical NMR studies of meso-tetra (4-pyridyl)porphyrinatothallium(III) acetate: Tl(tpyp)(OAc)“. Polyhedron 13, Nr. 21 (November 1994): 3031–37. http://dx.doi.org/10.1016/s0277-5387(00)83425-7.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

32

Sun, Xuan, Xuegui Cui, Dennis P. Arnold, Michael T. M. Choi, Dennis K. P. Ng und Jianzhuang Jiang. „The Electronic Absorption Characteristics of Mixed Phthalocyaninato Porphyrinato Rare Earth(III) Triple-Deckers M2(TPyP)2(Pc)“. European Journal of Inorganic Chemistry 2003, Nr. 8 (April 2003): 1555–61. http://dx.doi.org/10.1002/ejic.200390203.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

33

Sengupta, Ananya, Subhadeep Datta, Chenliang Su, Tun Seng Herng, Jun Ding, Jagadese J. Vittal und Kian Ping Loh. „Tunable Electrical Conductivity and Magnetic Property of the Two Dimensional Metal Organic Framework [Cu(TPyP)Cu2(O2CCH3)4]“. ACS Applied Materials & Interfaces 8, Nr. 25 (20.06.2016): 16154–59. http://dx.doi.org/10.1021/acsami.6b03073.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

34

Tang, Suh-Shing, Ming-Torng Sheu, Yun-Huin Lin, I.-Chih Liu, Jyh-Horung Chen und Shin-Shin Wang. „Synthesis, 1H and 13C NMR characterization of methyl-meso-tetra(4-pyridyl)-porphyrinato thallium(III): Tl(tpyp)CH3“. Polyhedron 14, Nr. 2 (Januar 1995): 301–5. http://dx.doi.org/10.1016/0277-5387(94)00358-l.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

35

Sherman, Aurora M., Brian de Vries und Jennifer E. Lansford. „Friendship in Childhood and Adulthood: Lessons across the Life Span“. International Journal of Aging and Human Development 51, Nr. 1 (Juli 2000): 31–51. http://dx.doi.org/10.2190/4qfv-d52d-tpyp-rlm6.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

36

Konarev, Dmitri V., Alexey L. Litvinov, Ivan S. Neretin, Natalia V. Drichko, Yury L. Slovokhotov, Rimma N. Lyubovskaya, Judith A. K. Howard und D. S. Yufit. „Formation of Coordination Porphyrin Pentamers in New Supramolecular Complex of Fullerene: {(ZnTPP)4·4-TPyP}·(C60)2·(C6H5CN)3.5“. Crystal Growth & Design 4, Nr. 4 (Juli 2004): 643–46. http://dx.doi.org/10.1021/cg034259f.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

37

Zhu, Peihua, Shanshan Li, Chuanrui Zhao, Yan Zhang und Jinghua Yu. „3D synergistical rGO/Eu(TPyP)(Pc) hybrid aerogel for high-performance NO2 gas sensor with enhanced immunity to humidity“. Journal of Hazardous Materials 384 (Februar 2020): 121426. http://dx.doi.org/10.1016/j.jhazmat.2019.121426.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

38

Seo, Hak Soo, Yeon Jong Koo, Jae Yun Lim, Jong Tae Song, Chung Ho Kim, Ju Kon Kim, Jong Seob Lee und Yang Do Choi. „Characterization of a Bifunctional Enzyme Fusion of Trehalose-6-Phosphate Synthetase and Trehalose-6-Phosphate Phosphatase of Escherichia coli“. Applied and Environmental Microbiology 66, Nr. 6 (01.06.2000): 2484–90. http://dx.doi.org/10.1128/aem.66.6.2484-2490.2000.

Der volle Inhalt der Quelle

Annotation:

ABSTRACT To test the effect of the physical proximity of two enzymes catalyzing sequential reactions, a bifunctional fusion enzyme, TPSP, was constructed by fusing the Escherichia coli genes for trehalose-6-phosphate (T6P) synthetase (TPS) and trehalose-6-phosphate phosphatase (TPP). TPSP catalyzes the sequential reaction in which T6P is formed and then dephosphorylated, leading to the synthesis of trehalose. The fused chimeric gene was overexpressed in E. coli and purified to near homogeneity; its molecular weight was 88,300, as expected. The Km values of the TPSP fusion enzyme for the sequential overall reaction from UDP-glucose and glucose 6-phosphate to trehalose were smaller than those of an equimolar mixture of TPS and TPP (TPS/TPP). However, thek cat values of TPSP were similar to those of TPS/TPP, resulting in a 3.5- to 4.0-fold increase in the catalytic efficiency (k cat/Km ). The Km and k cat values of TPSP and TPP for the phosphatase reaction from T6P to trehalose were quite similar. This suggests that the increased catalytic efficiency results from the proximity of TPS and TPP in the TPSP fusion enzyme. The thermal stability of the TPSP fusion enzyme was quite similar to that of the TPS/TPP mixture, suggesting that the structure of each enzyme moiety in TPSP is unperturbed by intramolecular constraint. These results clearly demonstrate that the bifunctional fusion enzyme TPSP catalyzing sequential reactions has kinetic advantages over a mixture of both enzymes (TPS and TPP). These results are also supported by the in vivo accumulation of up to 0.48 mg of trehalose per g of cells after isopropyl-β-d-thiogalactopyranoside treatment of cells harboring the construct encoding TPSP.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

39

Plutino, Maria Rosaria, Maria Angela Castriciano, Antonino Mazzaglia, Maria Saporita, Andrea Romeoa und Luigi Monsù Scolaro. „Synthesis and aggregation behavior of a novel water-soluble porphyrin platinum(II) terpyridine complex“. Journal of Porphyrins and Phthalocyanines 15, Nr. 09n10 (September 2011): 1052–61. http://dx.doi.org/10.1142/s1088424611003975.

Der volle Inhalt der Quelle

Annotation:

A new water soluble tetranuclear platinum(II) porphyrin complex cation has been synthesized through the coordination of four [ Pt (2,2′:6′,2″-terpyridine)] moieties to the pyridyl groups of 5,10,15,20-tetrakis(4-pyridyl)-21H,23H-porphine (TPyP). The porphyrin derivative has been fully characterized by a combination of spectroscopic techniques. The high positive charge of the complex cation (8+) inhibits the aggregation in aqueous solution at low concentrations. By increasing the ionic strength, the electrostatic repulsion is screened leading to the formation of large unstable aggregates. The formation of microsized globular objects still emissive on the solid state is easily achieved by simple evaporation from diluted solutions. The solubilization of the complex in anionic aqueous surfactant solutions (sodium dodecyl sulfate, SDS) has revealed the inclusion of the complex ion in the hydrophobic region of the micelles as a monomeric species. Kinetics of Cu(II) insertion into the free-base tetranuclear Pt(II) porphyrin complex have been carried out in micellar media and the rate constants have been determinated.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

40

Gianferrara, Teresa, Barbara Serli, Ennio Zangrando, Elisabetta Iengo und Enzo Alessio. „Pyridylporphyrins peripherally coordinated to ruthenium-nitrosyls, including the water-soluble Na4[Zn·4′TPyP{RuCl4(NO)}4]: synthesis and structural characterization“. New Journal of Chemistry 29, Nr. 7 (2005): 895. http://dx.doi.org/10.1039/b418855a.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

41

Dickie, Diane A., Hanifa Jalali, Rahul G. Samant, Michael C. Jennings und Jason AC Clyburne. „Synthesis and structural characterization of m-terphenyl Schiff base ligands and their aluminum complexes“. Canadian Journal of Chemistry 82, Nr. 9 (01.09.2004): 1346–52. http://dx.doi.org/10.1139/v04-110.

Der volle Inhalt der Quelle

Annotation:

2,4,6-Triphenylbenzaldehyde 1 undergoes a condensation reaction with 2-aminophenol to give N-(2′,4′,6′-triphenylbenzylidene)-2-iminophenol (TPIP) 2. The imine 2 can be reduced with NaBH4 in ethanol to form N-(2′,4′,6′-triphenylbenzyl)-2-aminophenol (TPAP) 3. Addition of trimethylaluminum to 2 or 3 results in the formation of the complexes TPIP-AlMe2·AlMe3 (4) or TPAP-AlMe2 (5). Compounds 2, 3, and 4 have been crystallographically characterized.Key words: N,O ligands, aluminum, m-terphenyl, Schiff bases, X-ray crystallography.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

42

Jiang, Jianzhuang, Ken-ichi Machida und Gin-ya Adachi. „Synthesis of Water-Soluble Lanthanide Porphyrin Sandwich Complexes: Bis(tetrapyridylporphyrinato) Cerium(IV), [Ce(tpyp)2], and Bis(tetramethylpyridylporphyrinato) Cerium(IV), [Ce(tmpyp)2]“. Bulletin of the Chemical Society of Japan 65, Nr. 7 (Juli 1992): 1990–92. http://dx.doi.org/10.1246/bcsj.65.1990.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

43

Borders, Bryan, Morteza Adinehnia, Naomi Rosenkrantz, Marshall van Zijll, K. W. Hipps und Ursula Mazur. „Photoconductive behavior of binary porphyrin crystalline assemblies“. Journal of Porphyrins and Phthalocyanines 21, Nr. 09 (September 2017): 569–80. http://dx.doi.org/10.1142/s1088424617500638.

Der volle Inhalt der Quelle

Annotation:

The mechanism of photoconductivity in a crystalline photoconductor synthesized from 1:1 ratio of meso-tetra(4-pyridyl)porphyrin (TPyP) and meso-tetra(4-sulfonatophenyl)porphyrin (TSPP) ionic tectons was examined. The rod-like crystals of TPyP:TSPP insulate in the dark but become photoconducting on illumination and a portion of the photoinduced current persists after the laser light is turned off. This persistent photoconductivity (PPC) is investigated as a function of laser illumination wavelength, laser power, and sample temperature. The primary charge carriers in the TPyP:TSPP upon photoexcitation are electrons and the charge recombination mechanism follows monomolecular kinetics. The number of electrons contributing to the photocurrent is directly proportional to the number of photons absorbed thus, the mechanisms of the photoconductivity resulting from excitations within the Soret band and the Q-band are the same. The PPC is interpreted to be the result of the formation of photoinduced metastable defects that allow for Miller–Abrahams-like hopping conductivity. The TPyP:TSPP has an incommensurately modulated crystal lattice and its proposed model structure is based on both ionic and neutral porphyrin tectons. The thermogravimetric analysis shows that the porphyrin crystals undergo dehydration on heating (˜50 ∘C) by losing water molecules located in the crystalline channels. Temperature dependent XRD indicates that dehydration causes irreversible changes to the crystal structure. The loss of crystallinity observed with heating the TPyP:TSPP crystals above 90 ∘C causes approximately 25% loss in photoconductivity but has little effect on the lifetime associated with the persistent photoconductivity.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

44

Sousa, Luana M., Luana M. Vilarinho, Gabriel H. Ribeiro, André L. Bogado und Luís R. Dinelli. „An electronic device based on gold nanoparticles and tetraruthenated porphyrin as an electrochemical sensor for catechol“. Royal Society Open Science 4, Nr. 12 (Dezember 2017): 170675. http://dx.doi.org/10.1098/rsos.170675.

Der volle Inhalt der Quelle

Annotation:

The aim of this study was to obtain an electrochemical device between the electrostatic interaction of the electropolymerized porphyrin {CoTPyP[RuCl 3 (dppb)] 4 }, where TPyP = 5,10,15, 20-tetrapyridilphorphyrin and dppb = 1,4-bis(diphenylphosphino)butane, and gold nanoparticles (AuNPs n− ), to be used as a voltammetric sensor to determine catechol (CC). The modified electrode, labelled as [(CoTPRu 4 ) n 8+ -BE]/AuNPs n− {where BE = bare electrode = glassy carbon electrode (GCE) or indium tin oxide (ITO)}, was made layer-by-layer. Initially, a cationic polymeric film was generated by electropolymerization of the {CoTPyP[RuCl 3 (dppb)] 4 } onto the surface of the bare electrode to produce an intermediary electrode [(CoTPRu 4 ) n 8+ -BE]. Making the final electronic device also involves coating the electrode [(CoTPRu 4 ) n 8+ -BE] using a colloidal suspension of AuNPs n− by electrostatic interaction between the species. Therefore, a bilayer labelled as [(CoTPRu 4 ) n 8+ -BE]/AuNPs n− was produced and used as an electrochemical sensor for CC determination. The electrochemical behaviour of CC was investigated using cyclic voltammetry at [(CoTPRu 4 ) n 8+ -GCE]/AuNPs n− electrode. Compared to the GCE, the [(CoTPRu 4 ) n 8+ -GCE]/AuNPs n− showed higher electrocatalytic activity towards the oxidation of CC. Under the optimized conditions, the calibration curves for CC were 21–1357 µmol l −1 with a high sensitivity of 108 µA µmol l −1 cm −2 . The detection limit was 1.4 µmol l −1 .

APA, Harvard, Vancouver, ISO und andere Zitierweisen

45

Hong, Tay-Ning, Yeong-Horng Sheu, Keh-Wen Jang, Jyh-Horung Chen, Shin-Shin Wang, Ju-Chun Wang und Sue-Lein Wang. „A new synthesis of acetato porphyrinato indium(III) from indium(III) oxide and X-ray crystal structures of In(tpyp)(OAc) and In(tmpp)(OAc)“. Polyhedron 15, Nr. 15 (August 1996): 2647–54. http://dx.doi.org/10.1016/0277-5387(95)00541-2.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

46

Ross, Meredith F., Tracy A. Prime, Irina Abakumova, Andrew M. James, Carolyn M. Porteous, Robin A. J. Smith und Michael P. Murphy. „Rapid and extensive uptake and activation of hydrophobic triphenylphosphonium cations within cells“. Biochemical Journal 411, Nr. 3 (14.04.2008): 633–45. http://dx.doi.org/10.1042/bj20080063.

Der volle Inhalt der Quelle

Annotation:

Mitochondria-targeted molecules comprising the lipophilic TPP (triphenylphosphonium) cation covalently linked to a hydrophobic bioactive moiety are used to modify and probe mitochondria in cells and in vivo. However, it is unclear how hydrophobicity affects the rate and extent of their uptake into mitochondria within cells, making it difficult to interpret experiments because their intracellular concentration in different compartments is uncertain. To address this issue, we compared the uptake into both isolated mitochondria and mitochondria within cells of two hydrophobic TPP derivatives, [3H]MitoQ (mitoquinone) and [3H]DecylTPP, with the more hydrophilic TPP cation [3H]TPMP (methyltriphenylphosphonium). Uptake of MitoQ by mitochondria and cells was described by the Nernst equation and was ∼5-fold greater than that for TPMP, as a result of its greater binding within the mitochondrial matrix. DecylTPP was also taken up extensively by cells, indicating that increased hydrophobicity enhanced uptake. Both MitoQ and DecylTPP were taken up very rapidly into cells, reaching a steady state within 15 min, compared with ∼8 h for TPMP. This far faster uptake was the result of the increased rate of passage of hydrophobic TPP molecules through the plasma membrane. Within cells MitoQ was predominantly located within mitochondria, where it was rapidly reduced to the ubiquinol form, consistent with its protective effects in cells and in vivo being due to the ubiquinol antioxidant. The strong influence of hydrophobicity on TPP cation uptake into mitochondria within cells facilitates the rational design of mitochondria-targeted compounds to report on and modify mitochondrial function in vivo.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

47

Lin, Shwu-Juian, Tay-Ning Hong, Jo-Yu Tung und Jyh-Horung Chen. „Molecular Structures of Ge(tpp)(OAc)2and In(tpp)(OAc) and Their Implications: Correlations between the13C NMR Chemical Shift of the Acetato Ligand and Different Types of Carboxylate Coordination in M(por)(OAc)n{por = tpp (5,10,15,20-Tetraphenylporphyrinate), tmpp (5,10,15,20-Tetrakis(4-methoxyphenyl)porphyrinate), tpyp (5,10,15,20-Tetrakis(4-pyridyl)porphyrinate); M = Ga, In, Tl, Ge, Sn;n= 1, 2}“. Inorganic Chemistry 36, Nr. 18 (August 1997): 3886–91. http://dx.doi.org/10.1021/ic961304i.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

48

Adinehnia, Morteza, Jeremy R. Eskelsen, K. W. Hipps und Ursula Mazur. „Mechanical behavior of crystalline ionic porphyrins“. Journal of Porphyrins and Phthalocyanines 23, Nr. 01n02 (Januar 2019): 154–65. http://dx.doi.org/10.1142/s1088424619500147.

Der volle Inhalt der Quelle

Annotation:

Mechanical properties of six different binary ionic porphyrin crystals with variable morphologies were measured and correlated with their structural properties. These solids were formed from stoichiometric combinations of negatively charged tectons, meso-tetra(4-sulfonatophenyl)porphyrin (TSPP), Cu(II) meso-tetra(4-sulfonatophenyl)porphyrin (CuTSPP), Ni(II) meso-tetra (4-sulfonatophenyl)porphyrin (NiTSPP), and four different cationic tectons, namely, meso-tetra (4-pyridyl)porphyrin (TPyP), tetra([Formula: see text]-methyl-4-pyridyl)porphyrin (TMPyP), Cu(II) meso-tetra([Formula: see text]-methyl-4-pyridyl)porphyrin (CuTMPyP), Ni(II) meso-tetra([Formula: see text]-methyl-4-pyridyl)porphyrin (NiTMPyP), and tetra(4-aminophenyl)porphyrin (TAPP). Crystal structures were determined from single crystal and powder X-ray diffraction patterns. Scanning electron and atomic force microscopes (SEM and AFM) provided topographical information. The common arrangement of the porphyrin tectons within the crystals is consistent with alternating face-to-face molecular arrangement forming coherent columns along the fast-growing long axis which are held together by electrostatic and [Formula: see text]–[Formula: see text] interactions as well as hydrogen bonding. In acquiring the indentation data of the porphyrin crystals using AFM, stress was applied perpendicular to the direction where ionic and [Formula: see text]–[Formula: see text] bonds dominate the packing. At indent loads [Formula: see text]50 nN/nm2, all the porphyrin structures deformed elastically. Young’s modulus ([Formula: see text] values for the different crystals range from 6 to 28 GPa. In a broader perspective, this study highlights the extraordinary mechanical behavior of porphyrin assemblies formed by ionic self-assembly. Judicious selection of charged porphyrin synthons can yield crystalline materials with mechanical properties that combine the elastic characteristics of ‘soft’ polymers with the stiffness of composite materials. Such high-performance materials are excellent candidates for deformable optoelectronic devices.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

49

Ghafuri, Hossein, Fatemeh Mohammadi, Rahmatallah Rahimi und Esmaeel Mohammadiyan. „Synthesis and characterization of a new magnetic nanocomposite with metalloporphyrin (Co-TPyP) and sulfated tin dioxide (Fe3O4@SnO2/SO42−), and investigation of its photocatalytic effects in the degradation of Rhodamine B“. RSC Advances 6, Nr. 87 (2016): 83947–53. http://dx.doi.org/10.1039/c6ra17712c.

Der volle Inhalt der Quelle

Annotation:

To achieve the synthesis of (Fe₃O₄@SnO₂/SO₄²⁻), after the preparation of magnetic nanoparticles of Fe₃O₄ (MNP), tin dioxide was supported on the MNP, and it was sulfated using ammonium sulfate.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

50

Ghoddusi, Hamid B., und Richard K. Robinson. „Enumeration of starter cultures in fermented milks“. Journal of Dairy Research 63, Nr. 1 (Februar 1996): 151–58. http://dx.doi.org/10.1017/s0022029900031629.

Der volle Inhalt der Quelle

Annotation:

SummarySome media available for the isolation and enumeration of starter cultures employed for the manufacture of cheese, yogurt and bio-yogurt were examined. Reddy's medium or a modification of Elliker's medium was found to be most satisfactory forLactococcusspp., while trypticase phytone yeast (TPY) agar with a mixture of antibiotics proved suitable for the discrete enumeration ofBifidobacteriumspp. The inclusion of Prussian blue (PB) in reinforced clostridial medium or tryptone proteose peptone yeast extract (TPPY) agar gave excellent differential counts for the starter bacteria in yogurt even when the culture was imbalanced, while TPPY (PB) agar allowed the visible separation of all four of the organisms that might be found in a typical bio-yogurt, namelyLactobacillus delbrueckiisubsp.bulgaricus, Streptococcus thermophilus, a,Bifidobacteriumsp. andLb. acidophilus. It was noted that variation among different strains of any given species could change the expected reactions, so for quality control purposes the suggested media may need to be modified to cope with the specific cultures in use.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Wir bieten Rabatte auf alle Premium-Pläne für Autoren, deren Werke in thematische Literatursammlungen aufgenommen wurden. Kontaktieren Sie uns, um einen einzigartigen Promo-Code zu erhalten!