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Journal articles on the topic 'Donor-Acceptor pairs'

Author: Grafiati

Published: 22 February 2025

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1

Forkel, D., N. Achtziger, A. Baurichter, M. Deicher, S. Deubler, M. Puschmann, H. Wolf, and W. Witthuhn. "Acceptor-donor pairs in germanium." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 63, no. 1-2 (January 1992): 217–20. http://dx.doi.org/10.1016/0168-583x(92)95198-z.

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2

Zhong, Cheng, Jinwei Zhou, and Charles L. Braun. "Electron-transfer absorption of sterically bulky donor–acceptor pairs: electron donor–acceptor complexes or random pairs?" Journal of Photochemistry and Photobiology A: Chemistry 161, no. 1 (November 2003): 1–9. http://dx.doi.org/10.1016/s1010-6030(03)00233-8.

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3

Lee, Jungho, Sang Myeon Lee, Shanshan Chen, Tanya Kumari, So‐Huei Kang, Yongjoon Cho, and Changduk Yang. "Organic Photovoltaics with Multiple Donor–Acceptor Pairs." Advanced Materials 31, no. 20 (November 16, 2018): 1804762. http://dx.doi.org/10.1002/adma.201804762.

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4

Yamamoto, S., J. Pirillo, Y. Hijikata, Z. Zhang, and K. Awaga. "Nanopore-induced host–guest charge transfer phenomena in a metal–organic framework." Chemical Science 9, no. 13 (2018): 3282–89. http://dx.doi.org/10.1039/c7sc05390h.

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Using the “crystal sponge” approach, weak organic electron donor molecules were impregnated and evenly distributed in a crystal of a metal–organic framework (MOF), with the self-assembly of the donor–acceptor pairs with electron acceptor ligands. The nanopores of the MOF confined them and induced a charge transfer phenomenon, which would not occur between donor and acceptor molecules in a bulk scale.

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5

Cheng, K. H., T. Wiedmer, and P. J. Sims. "Fluorescence resonance energy transfer study of the associative state of membrane-bound complexes of complement proteins C5b-8." Journal of Immunology 135, no. 1 (July 1, 1985): 459–64. http://dx.doi.org/10.4049/jimmunol.135.1.459.

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Abstract Human complement protein C8 was labeled with the fluorescent chromophores fluorescein-5-isothiocyanate (FITC), 3-(4-isothiocyanatophenyl)-7-diethylamine-4-methyl coumarin (IPM), eosin-5-isothiocyanate (EOS), or Texas Red (sulforhodamine-101-sulfonyl chloride; TR) with only minor reduction in the specific hemolytic activity of the protein. The distribution of C5b-8 complexes bound to sheep erythrocyte membranes was investigated by monitoring fluorescence resonance energy transfer (RET) between the following RET donor/acceptor pairs of labeled C8: FITC-C8/EOS-C8, IPM-C8/EOS-C8, and FITC-C8/TR-C8. On binding to membranes containing pre-formed C5b67 complexes, specific RET was detected for each of the donor/acceptor pairs of labeled C8 investigated. In contrast, no energy transfer was observed for these RET donor/acceptor pairs of labeled C8 incubated in the presence of control membranes or in membrane-free solution. On the basis of a consideration of the transfer efficiency that would be expected for donor/acceptor pairs of labeled C8 that were uniformly dispersed on the membrane surface, these results suggest that C5b-8 complexes are aggregated into polymeric clusters when membrane-bound. The efficiency of donor-C8 to acceptor-C8 RET--and the hemolytic activity of membrane-bound C5b-8 (in the absence of C9)--are both related to the surface density of membrane-bound C5b67, suggesting that the physical clustering of the membrane-inserted C5b-8 complex may be related to the expression of its cytolytic activity.

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6

Lu, Xin. "Single photon emitters originating from donor–acceptor pairs." Journal of Semiconductors 44, no. 1 (January 1, 2023): 010401. http://dx.doi.org/10.1088/1674-4926/44/1/010401.

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7

Marceddu, M., A. Anedda, C. M. Carbonaro, D. Chiriu, R. Corpino, and P. C. Ricci. "Donor–acceptor pairs and excitons recombinations in AgGaS2." Applied Surface Science 253, no. 1 (October 2006): 300–305. http://dx.doi.org/10.1016/j.apsusc.2006.06.002.

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8

Krustok, J. "Orange luminescence of donor-acceptor pairs in CdS:Ag:Cl." Journal of Physics and Chemistry of Solids 53, no. 8 (August 1992): 1027–30. http://dx.doi.org/10.1016/0022-3697(92)90073-m.

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9

Sheng, Yinghong, and Jerzy Leszczynski. "Theoretical Study of the Substituent and Solvent Effects on the Molecular Structures, Absorption and Emission Spectra of Open-Form Spiropyrans." Collection of Czechoslovak Chemical Communications 69, no. 1 (2004): 47–62. http://dx.doi.org/10.1135/cccc20040047.

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The effects of substituents and solvents on the molecular structures, excitation energies and emission energies of a series of donor-acceptor substituted spiropyrans were investigated using the density functional methods. Different donor-acceptor pairs lead to alternations of the molecular structures. A relationship between the strengths of donor-acceptor pairs and the structural parameter BLA (bond length alternation) was examined and discussed. The impact on geometrical parameters induced by the solvents is more significant than that caused by the substituents, as indicated by the larger BLA changes. The substituent and solvent effects on the UV absorption and emission spectra of open-form spiropyrans were studied by the TD-DFT method. The absorption maxima of open-form spiropyrans are expected to red shift, and the emission are expected to blue shift as the strengths of donor-acceptor pairs and the polarities of solvents increase. A simple model was adopted to mimic the substituent and solvent effects, in the framework of AM1, employing Sparkles to create an external electric field on the open-form spiropyran, in order to induce a systematical polarization of the molecular equilibrium geometry and the electronic configuration.

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10

Harvey, Pierre D., Mikhail A. Filatov, and Roger Guilard. "Bis- and trisporphyrin bio-inspired models for bacterial antennas and photosystems." Journal of Porphyrins and Phthalocyanines 15, no. 11n12 (November 2011): 1150–71. http://dx.doi.org/10.1142/s1088424611004221.

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This review presents the synthetic aspects and photophysical properties of trimeric systems constructed with a first unit consisting of a cofacial porphyrin and then of another porphyrin attached as a side arm. Two scenarios are dealt with. The first one is the case where the three chromophores are different, called donor 1–donor 2–acceptor, specifically where the cofacial fragment is composed of donor 1 and donor 2, and the side arm is the acceptor. They are considered as models for the apo-proteins used in the LH II (light harvesting device) in the purple photosynthetic bacteria. The second one is the case where the chromophores of the cofacial bisporphyrin residue are identical and are closely placed to each other for inter-ring π-interactions. The side arm is simply a mono-porphyrin, and therefore it is different. The cofacial bisporphyrin unit exhibits then similar characteristics to the special pairs located within the reaction center protein, and are designated as artificial special pairs. On the synthetic standpoint, the various pathways to access such models are presented fully exploiting the Suzuki methodology. On the photophysical side, a large emphasis will be placed on the singlet energy transfers. Cascade processes in the trimers donor 1–donor 2–acceptor are presented and each individual contributions donor 1 → donor 2; donor 2 → acceptor; donor → acceptor are addressed qualitatively and quantitatively. For the artificial special pairs flanked with an antenna, the effect of the spacer between the artificial special pair and the antenna will be discussed as well as the choice of substituents and metal demonstrating that one can reverse the orientation of the singlet energy transfer: artificial special pair → side arm or side arm → artificial special pair. Finally, the antenna effect are presented for one example of artificial special pair equipped with 6 semi-flexible dendritic antennas.

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11

POY, Cecília Dominical, and Marinônio Lopes CORNÉLIO. "Electron migration in DNA matrix: an electron transfer reaction." Eclética Química 23 (1998): 99–109. http://dx.doi.org/10.1590/s0100-46701998000100009.

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This paper brings an active and provocative area of current research. It describes the investigation of electron transfer (ET) chemistry in general and ET reactions results in DNA in particular. Two DNA intercalating molecules were used: Ethidium Bromide as the donor (D) and Methyl-Viologen as the acceptor (A), the former intercalated between DNA bases and the latter in its surface. Using the Perrin model and fluorescence quenching measurements the distance of electron migration, herein considered to be the linear spacing between donor and acceptor molecule along the DNA molecule, was obtained. A value of 22.6 (± 1.1) angstroms for the distance and a number of 6.6 base pairs between donor and acceptor were found. In current literature the values found were 26 angstroms and almost 8 base pairs. DNA electron transfer is considered to be mediated by through-space interactions between the p-electron-containing base pairs.

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12

Poy, Cecília Dominical, and Marinônio Lopes Cornélio. "Electron migration in DNA matrix: an electron transfer reaction." Ecletica Quimica 23, no. 1 (December 7, 1998): 99–109. http://dx.doi.org/10.26850/1678-4618eqj.v23.1.1998.p99-109.

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This paper brings an active and provocative area of current research. It describes the investigation of electron transfer (ET) chemistry in general and ET reactions results in DNA in particular. Two DNA intercalating molecules were used: Ethidium Bromide as the donor (D) and Methyl-Viologen as the acceptor (A), the former intercalated between DNA bases and the latter in its surface. Using the Perrin model and fluorescence quenching measurements the distance of electron migration, herein considered to be the linear spacing between donor and acceptor molecule along the DNA molecule, was obtained. A value of 22.6 (± 1.1) angstroms for the distance and a number of 6.6 base pairs between donor and acceptor were found. In current literature the values found were 26 angstroms and almost 8 base pairs. DNA electron transfer is considered to be mediated by through-space interactions between the p-electron-containing base pairs.

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13

Kim, Kookjoo, Mykhailo Kopylov, Daija Bobe, Kotaro Kelley, Edward T. Eng, Peter Arvan, and Oliver B. Clarke. "The structure of natively iodinated bovine thyroglobulin." Acta Crystallographica Section D Structural Biology 77, no. 11 (October 29, 2021): 1451–59. http://dx.doi.org/10.1107/s2059798321010056.

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Thyroglobulin is a homodimeric glycoprotein that is essential for the generation of thyroid hormones in vertebrates. Upon secretion into the lumen of follicles in the thyroid gland, tyrosine residues within the protein become iodinated to produce monoiodotyrosine (MIT) and diiodotyrosine (DIT). A subset of evolutionarily conserved pairs of DIT (and MIT) residues can then engage in oxidative coupling reactions that yield either thyroxine (T4; produced from coupling of a DIT `acceptor' with a DIT `donor') or triiodothyronine (T3; produced from coupling of a DIT acceptor with an MIT donor). Although multiple iodotyrosine residues have been identified as potential donors and acceptors, the specificity and structural context of the pairings (i.e. which donor is paired with which acceptor) have remained unclear. Here, single-particle cryogenic electron microscopy (cryoEM) was used to generate a high-resolution reconstruction of bovine thyroglobulin (2.3 Å resolution in the core region and 2.6 Å overall), allowing the structural characterization of two post-reaction acceptor–donor pairs as well as tyrosine residues modified as MIT and DIT. A substantial spatial separation between donor Tyr149 and acceptor Tyr24 was observed, suggesting that for thyroxine synthesis significant peptide motion is required for coupling at the evolutionarily conserved thyroglobulin amino-terminus.

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14

ERINA, M. V., and M. I. DERYABIN. "DETERMINATION OF THE TRIPLET STATE POPULATION OF ACCEPTOR MOLECULES BY CHANGES IN THE INTENSITY OF SENSITIZED PHOSPHORESCENCE." Izvestiya vysshikh uchebnykh zavedenii. Fizika 67, no. 6 (2024): 63–70. https://doi.org/10.17223/00213411/67/6/10.

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Based on the expression obtained using a labeled graph of states of donor-acceptor pairs, a simple analytical relationship has been established between the stationary population of the triplet T 1-state of acceptor molecules and the multiples of changes in donor photoexcitation intensities and sensitized phosphorescence of the acceptor, similar to that obtained previously for a one-component solution. The calculated values of the relative stationary population qT of the T 1-state of the acceptor pair benzophenone (donor) - acenaphthene (acceptor) are in good agreement with the results obtained by the well-known method based on the times of rise and decay of sensitized phosphorescence. The limitations of using the proposed method are indicated.

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15

Milenin, G. V., and R. A. Redko. "Analysis of the transformation of radiative recombination spectra of n-GaN after magnetic field treatments based on the queueing theories concept." Semiconductor Physics, Quantum Electronics and Optoelectronics 27, no. 03 (September 20, 2024): 269–73. http://dx.doi.org/10.15407/spqeo27.03.269.

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Long-term changes in radiative recombination spectra of n-GaN after magnetic field treatments have been studied. It has been found out that the intensity of the radiation of donor-acceptor pairs remains unchanged over time, while the intensity of edge photoluminescence significantly decreases. These features have been explained by assuming the formation of additional donor levels and using the concepts of the queueing theory of donor-acceptor recombination.

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16

Krzyaniak, Matthew D., Lukáš Kobr, Brandon K. Rugg, Brian T. Phelan, Eric A. Margulies, Jordan N. Nelson, Ryan M. Young, and Michael R. Wasielewski. "Fast photo-driven electron spin coherence transfer: the effect of electron-nuclear hyperfine coupling on coherence dephasing." Journal of Materials Chemistry C 3, no. 30 (2015): 7962–67. http://dx.doi.org/10.1039/c5tc01446h.

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A covalently-linked electron donor–acceptor–acceptor molecule was utilized to study the effect of electron-nuclear hyperfine coupling on the dephasing of the zero quantum coherence in spin correlated radical pairs.

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17

Liu, Liu Leo, and Douglas W. Stephan. "Radicals derived from Lewis acid/base pairs." Chemical Society Reviews 48, no. 13 (2019): 3454–63. http://dx.doi.org/10.1039/c8cs00940f.

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While conventional approaches to stabilizing main group radicals have involved the use of Lewis acids or bases, this tutorial review focuses on new avenues to main group radicals derived from combinations of donor and acceptor molecules.

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18

Harris, T. D., J. K. Trautman, and J. I. Colonell. "Dynamics of Selectively Excited Donor Acceptor Pairs in GaAs." Materials Science Forum 65-66 (January 1991): 21–28. http://dx.doi.org/10.4028/www.scientific.net/msf.65-66.21.

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19

Fritzsch, B., and A. Zehe. "Distribution function of donor-acceptor pairs in nipi-structures." Superlattices and Microstructures 12, no. 1 (January 1992): 43–46. http://dx.doi.org/10.1016/0749-6036(92)90217-s.

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20

Hübner, Christian G., Vsevolod Ksenofontov, Fabian Nolde, Klaus Müllen, and Thomas Basché. "Three-dimensional orientational colocalization of individual donor–acceptor pairs." Journal of Chemical Physics 120, no. 23 (June 15, 2004): 10867–70. http://dx.doi.org/10.1063/1.1760492.

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21

Morhain, C., E. Tournié, G. Neu, C. Ongaretto, and J. P. Faurie. "Spectroscopy of donor-acceptor pairs in nitrogen-doped ZnSe." Physical Review B 54, no. 7 (August 15, 1996): 4714–21. http://dx.doi.org/10.1103/physrevb.54.4714.

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22

Ferreira da Silva, A. "Impurity states in doubly doped systems: Investigation of donor-donor and donor-acceptor pairs." Physical Review B 50, no. 15 (October 15, 1994): 11216–18. http://dx.doi.org/10.1103/physrevb.50.11216.

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23

Laishram, Raju, and Uday Maitra. "Energy transfer in FRET pairs in a supramolecular hydrogel template." Chemical Communications 58, no. 19 (2022): 3162–65. http://dx.doi.org/10.1039/d1cc07048g.

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24

Guo, Minmin, Huimin Yang, Yuting Du, Yingjin Wang, and Xiaojing Yang. "Enhanced photoelectrocatalytic performance of α-MnO₂ by Sb and N charge compensation." New Journal of Chemistry 45, no. 47 (2021): 22261–68. http://dx.doi.org/10.1039/d1nj03937g.

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25

Nardo, Luca, Maria Bondani, and Alessandra Andreoni. "Discrimination of the binding mode of DNA ligands by single-photon timing." Spectroscopy 23, no. 1 (2009): 11–28. http://dx.doi.org/10.1155/2009/605756.

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We perform time-correlated single-photon counting measurements with 30-ps resolution of the fluorescence emitted by the donor fluorophores of donor–acceptor pairs covalently labeling DNA synthetic oligonucleotides by using a non-commercial single-photon avalanche diode. The measurements allow us to precisely assess the fluorescence resonant energy transfer efficiency of the pairs in solutions containing the oligonucleotides and DNA–ligands, for different ratios of the DNA base-pair to ligand concentrations. A quantitative evaluation of the deformations of DNA double strands following the ligand binding is obtained, as the transfer efficiency is a steep function of the donor-to-acceptor distance. The results lead to an easy and cheap method to discriminate between the binding modes of minor groove and base intercalating ligands.

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26

Porcu, Pasquale, Mireille Vonlanthen, Andrea Ruiu, Israel González-Méndez, and Ernesto Rivera. "Energy Transfer in Dendritic Systems Having Pyrene Peripheral Groups as Donors and Different Acceptor Groups." Polymers 10, no. 10 (September 25, 2018): 1062. http://dx.doi.org/10.3390/polym10101062.

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In this feature article, a specific overview of resonance energy transfer (FRET) in dendritic molecules was performed. We focused mainly on constructs bearing peripheral pyrene groups as donor moieties using different acceptor groups, such as porphyrin, fullerene C60, ruthenium-bipyridine complexes, and cyclen-core. We have studied the effect of all the different donor-acceptor pairs in the energy transfer efficiency (FRET). In all cases, high FRET efficiency values were observed.

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27

Reshchikov, M. A., G. C. Yi, and B. W. Wessels. "Defect Luminescence in Heavily Mg Doped GaN." MRS Internet Journal of Nitride Semiconductor Research 4, S1 (1999): 968–73. http://dx.doi.org/10.1557/s1092578300003677.

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Behavior of the photoluminescence band at about 2.8 eV in heavily Mg doped GaN has been studied at different temperatures and excitation intensities. The 2.8 eV band is attributed to donor-acceptor transitions involving a Mg acceptor. The large blue shift of the band with increasing excitation intensity is explained by variation in the contribution of close and distant pairs to the luminescence. The red shift of the band with increasing temperature under high excitation intensity conditions results from thermal release of carriers from close pairs. The thermal activation energy of the deep donor, about 0.4 eV, is determined from the quenching of the 2.8 eV luminescence band at high temperatures.

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28

Malicka, J., R. Ganzynkowicz, M. Groth, C. Czaplewski, J. Karolczak, A. Liwo, and W. Wiczk. "Fluorescence decay time distribution analysis of cyclic enkephalin analogues; influence of solvent and Leu configuration in position 5 on conformation." Acta Biochimica Polonica 48, no. 1 (March 31, 2001): 95–102. http://dx.doi.org/10.18388/abp.2001_5115.

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Lifetime distribution analysis were performed to study the influence of Leu configuration in position 5 on changes of the peptide chain of cyclic analogues of enkephalins containing a fluorescence donor and acceptor in different solvents. The configuration change of Leu5 in all the analogues of enkephalins studied which contain donor-acceptor pairs has no apparent influence on Trp lifetime distributions. In contrast, there is a significant solvent effect on the shape of lifetime distribution.

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29

Stadnyk, Yu V., V. V. Romaka, V. A. Romaka, A. M. Нoryn, L. P. Romaka, V. Ya Krayovskyy, and І. М. Romaniv. "Investigation of Electronic Structure of Zr1-xVxNiSn Semiconductive Solid Solution." Фізика і хімія твердого тіла 20, no. 2 (July 10, 2019): 127–32. http://dx.doi.org/10.15330/pcss.20.2.127-132.

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The peculiarities of electronic and crystal structures of Zr1-xVxNiSn (x = 0 - 0.10) semiconductive solid solution were investigated. To predict Fermi level εF behavior, band gap εg and electrokinetic characteristics of Zr1-xVxNiSn, the distribution of density of electronic states (DOS) was calculated. The mechanism of simultaneous generation of structural defects of donor and acceptor nature was determined based on the results of calculations of electronic structure and measurement of electrical properties of Zr1-xVxNiSn semiconductive solid solution. It was established that in the band gap of Zr1-xVxNiSn the energy states of the impurity donor εD2 and acceptor εA1 levels (donor-acceptor pairs) appear, which determine the mechanisms of conduction of semiconductor.

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30

Wang, Yuhui, Kai Jiang, Jiali Zhu, Ling Zhang, and Hengwei Lin. "A FRET-based carbon dot–MnO2nanosheet architecture for glutathione sensing in human whole blood samples." Chemical Communications 51, no. 64 (2015): 12748–51. http://dx.doi.org/10.1039/c5cc04905a.

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31

Shimazaki, Tomomi, and Takahito Nakajima. "Theoretical study of exciton dissociation through hot states at donor–acceptor interface in organic photocell." Physical Chemistry Chemical Physics 17, no. 19 (2015): 12538–44. http://dx.doi.org/10.1039/c5cp00740b.

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32

Duan, Pengfei, Deepak Asthana, Takuya Nakashima, Tsuyoshi Kawai, Nobuhiro Yanai, and Nobuo Kimizuka. "All-or-none switching of photon upconversion in self-assembled organogel systems." Faraday Discussions 196 (2017): 305–16. http://dx.doi.org/10.1039/c6fd00170j.

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Aggregation-induced photon upconversion (iPUC) based on a triplet–triplet annihilation (TTA) process is successfully developed via controlled self-assembly of donor–acceptor pairs in organogel nanoassemblies. Although segregation of donor from acceptor assemblies has been an outstanding problem in TTA-based UC and iPUC, we resolved this issue by modifying both the triplet donor and aggregation induced emission (AIE)-type acceptor with glutamate-based self-assembling moieties. These donors and acceptors co-assemble to form organogels without segregation. Interestingly, these donor–acceptor binary gels show upconversion at room temperature but the upconversion phenomena were lost upon dissolution of the gels on heating. The observed changes in TTA-UC emission were thermally reversible, reflecting the controlled assembly/disassembly of the binary molecular systems. The observed on/off ratio of UC emission was much higher than that of the aggregation-induced fluorescence of the acceptor, which highlights the important role of iPUC, i.e., multi-exciton TTA for photoluminescence switching. This work bridges iPUC and supramolecular chemistry and provides a new strategy for designing stimuli-responsive upconversion systems.

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33

Wang, Fanji, Kyohei Nakano, Hiroyuki Yoshida, Kazuhito Hashimoto, Hiroshi Segawa, Chain-Shu Hsu, and Keisuke Tajima. "Effects of end-on oriented polymer chains at the donor/acceptor interface in organic solar cells." Journal of Materials Chemistry A 6, no. 45 (2018): 22889–98. http://dx.doi.org/10.1039/c8ta09307e.

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34

Vidal, Matías, Marcos Caroli Rezende, Camila Pastene, Carolina Aliaga, and Moisés Domínguez. "Solvatochromism of conjugated 4-N,N-dimethylaminophenyl-pyridinium donor–acceptor pairs." New Journal of Chemistry 42, no. 6 (2018): 4223–31. http://dx.doi.org/10.1039/c7nj04992g.

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A series of solvatochromic dyes consisting of an N,N-dimethylaminophenyl donor group conjugated with a 1-butylpyridinium acceptor ring through a 1,4-phenylene spacer were synthesized by a three-step procedure.

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35

Romaka, L. P., Yu V. Stadnyk, V. A. Romaka, A. M. Horyn, and V. Ya Krayovskyy. "Study of electrokinetic and magnetic properties of ZrNi1-xRhxSn semiconductive solid solution." Фізика і хімія твердого тіла 19, no. 1 (March 15, 2018): 21–28. http://dx.doi.org/10.15330/pcss.19.1.21-28.

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The features of electrokinetic, energy state and magnetic characteristics of ZrNi1-xRhxSn semiconductive solid solution were investigated in the ranges: T = 80-400 K, x = 0-0.10. It was shown that substitution of Ni atoms (3d84s2) by Rh atoms (4d85s1) in the structure of ZrNiSn compound generated the structural defects with acceptor nature, and holes became the main charge carriers in the ZrNi1-xRhxSn at low temperature. Based on analysis of the motion rate of the Fermi level ΔεF/Δх in ZrNi1-xRhxSn to the valence band and change of sign of thermopower coefficient from positive to negative it was suggested that the structural defects of acceptor and donor natures were generated simultaneously (donor-acceptor pairs), and deep donor band ɛD2 was formed.

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36

Romaka, V. A., Yu Stadnyk, L. Romaka, V. Krayovskyy, A. Нoryn, P. Klyzub, and V. Pashkevych. "Study of the structural, electrokinetic and magnetic characteristics of the Er1-xZrxNiSb semiconductor." Physics and Chemistry of Solid State 21, no. 4 (December 30, 2020): 689–94. http://dx.doi.org/10.15330/pcss.21.4.689-694.

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Peculiarities of the structural, electrokinetic, energetic, and magnetic characteristics of Er1-xZrxNiSb semiconductive solid solution, х=0–0.10, were studied. It was suggested that when Zr (4d25s2) atoms were introduced into the structure of the ErNiSb half-Heusler phase by substitution of Er (5d06s2) atoms in 4a position, Zr atoms can also simultaneously occupy the 4c position of Ni (3d84s2) atoms. As a result, in Er1-xZrxNiSb semiconductor, the structural defects of donor nature in position 4a and ones of acceptor nature in position 4c were generated simultaneously. In this case, in the band gap of Er1-xZrxNiSb, the energy states of impurity donor and acceptor bands (donor-acceptor pairs) appear and determine the electrical conductivity mechanism of the semiconductor.

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37

Krustok, J., T. Raadik, M. Grossberg, M. Kauk-Kuusik, V. Trifiletti, and S. Binetti. "Photoluminescence study of deep donor- deep acceptor pairs in Cu2ZnSnS4." Materials Science in Semiconductor Processing 80 (June 2018): 52–55. http://dx.doi.org/10.1016/j.mssp.2018.02.025.

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38

Kostadinov, I. Z. "Hopping conduction and luminescence relaxation due to donor-acceptor pairs." Physical Review B 35, no. 14 (May 15, 1987): 7618–22. http://dx.doi.org/10.1103/physrevb.35.7618.

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39

Aliaga, Carolina, Matías Vidal, Camila Pastenes, Marcos Caroli Rezende, and Moisés Domínguez. "Solvatofluorochromism of conjugated 4-methoxyphenyl-Pyridinium electron donor-acceptor pairs." Dyes and Pigments 166 (July 2019): 395–402. http://dx.doi.org/10.1016/j.dyepig.2019.03.054.

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BOER, K., and J. PIPREK. "Donor-acceptor pairs to limit Voc-improvement of photo-diodes." Solar Energy Materials and Solar Cells 32, no. 4 (April 1994): 395–403. http://dx.doi.org/10.1016/0927-0248(94)90102-3.

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Padula, Daniele, and Alessandro Troisi. "Concurrent Optimization of Organic Donor–Acceptor Pairs through Machine Learning." Advanced Energy Materials 9, no. 40 (September 3, 2019): 1902463. http://dx.doi.org/10.1002/aenm.201902463.

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ERMAKOVA, EKATERINA O., RAMIL N. NURTDINOV, and MIKHAIL S. GELFAND. "OVERLAPPING ALTERNATIVE DONOR SPLICE SITES IN THE HUMAN GENOME." Journal of Bioinformatics and Computational Biology 05, no. 05 (October 2007): 991–1004. http://dx.doi.org/10.1142/s0219720007003089.

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Over 50% of donor splice sites in the human genome have a potential alternative donor site at a distance of three to six nucleotides. Conservation of these potential sites is determined by the consensus requirements and by its exonic or intronic location. Several hundred pairs of overlapping sites are confirmed to be alternatively spliced as both sites in a pair are supported by a protein, by a full-length mRNA, or by expressed sequence tags (ESTs) from at least two independent clone libraries. Overlapping sites may clash with consensus requirements. Pairs with a site shift of four nucleotides are the most abundant, despite the frameshift in the protein-coding region that they introduce. The site usage in pairs is usually uneven, and the major site is more frequently conserved in other mammalian genomes. Overlapping alternative donor sites and acceptor sites may have different functional roles: alternative splicing of overlapping acceptor sites leads mainly to microvariations in protein sequences; whereas alternative donor sites often lead to frameshifts and thus either yield major differences in the protein sequence and structure, or generate nonsense-mediated decay-inducing mRNA isoforms likely involved in regulated unproductive splicing pathways.

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Ghosh, Pritha, and Jayanta Chatterjee. "CH–π interaction between cross-strand amino acid pairs stabilizes β-hairpins." Chemical Communications 56, no. 92 (2020): 14447–50. http://dx.doi.org/10.1039/d0cc05653g.

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Romaka, L. P., Yu V. Stadnyk, V. V. Romaka, V. Ya Krayovsky, P. F. Rogl, and A. M. Нoryn. "Investigation of Band Structure of ZrNiSn1-xGax Semiconductor Solid Solution." Фізика і хімія твердого тіла 18, no. 2 (June 15, 2017): 187–93. http://dx.doi.org/10.15330/pcss.18.2.187-193.

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The mechanism of simultaneous generation of donor-acceptor pairs in ZrNiSn1-xGax semiconductor solid solution is established. The modeled distribution of atoms in the crystal lattice of ZrNiSn1-xGax showed that the speed of movement of Fermi level εF, obtained from the band structure calculations is in agreement with experimental extracted from lnρ(1/T) dependencies. It is shown that with substitution of Sn (5s25p2) with Ga (4s24p1) atoms in 4b crystallographic site both acceptor and donor (vacancies in 4b site) defects are generated.

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Singh, Moirangthem Kiran, Mohammad Firoz Khan, Him Shweta, and Sobhan Sen. "Probe-location dependent resonance energy transfer at lipid/water interfaces: comparison between the gel- and fluid-phase of lipid bilayer." Physical Chemistry Chemical Physics 19, no. 38 (2017): 25870–85. http://dx.doi.org/10.1039/c7cp03108d.

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Fellows, Christopher. "Preliminary observations on the copolymerisation of acceptor monomer:donor monomer systems under microwave irradiation." Open Chemistry 3, no. 1 (March 1, 2005): 40–52. http://dx.doi.org/10.2478/bf02476236.

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AbstractThe mechanistic rationalisation of specific ‘microwave effects’ previously reported in a range of chemical reactions suggests that they may be observable in the freeradical copolymerisation of comonomer pairs capable of forming donor-acceptor complexes. Polymerisation under microwave irradiation is carried out for several comonomer pairs with weak donor-acceptor interactions, and no acceleration in rate or change in degree of alternation attributable to changes in propagation are observed. An increase in reaction rate of 150–200 % is observed for all systems, with trends in molecular weight suggesting this was due to an increase in radical flux. This is consistent with earlier reports of rate enhancement for free-radical polymerisations using the initiator 2,2′-azobis-isobutyronitrile, and it is proposed that microwave irradiation may reduce the amount of geminate radical recombination.

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Shivanna, Mohana, Mark D. Allendorf, Ali Abou Taka, Paul E. Schrader, Krupa Ramasesha, Laura M. McCaslin, and Vitalie Stavila. "Charge Transfer Donor-Acceptor Guests Confined within Metal-Organic Framework Crystals." ECS Meeting Abstracts MA2024-02, no. 37 (November 22, 2024): 2552. https://doi.org/10.1149/ma2024-02372552mtgabs.

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Organic donor-acceptor (D-A) co-crystals have emerged as a promising class of semiconductors for photovoltaic applications.1,2 These co-crystals, which are packed through π-stacking interactions, can form charge transfer (CT) excitons within donor-acceptor pairs. These materials can exhibit unique and rare properties such as ambipolar charge transport, room-temperature ferroelectricity, and non-linear optical properties. Confinement of such D-A pairs within crystalline porous host materials such as metal-organic materials (MOFs)3 has rarely been studied. This approach can improve energy and charge transfer interactions by constraining their interaction and minimizing nonradiative energy transfer. Additionally, the formation of D-A pairs as dimers or a polymeric phase without altering the CT interactions can be controlled; band gap tunability is also possible. We hypothesize that confining D-A pairs within a porous network will also enhance the exciton lifetime compared to its dimer state in a crystal or in solution. In 2014, we reported an example of successful confinement of dihexyl-sexithiophene (acceptor) and [6,6]-phenyl-C61-butyric acid methyl ester (donor) molecules within the pores of MOF-177.4 In the present work, we focused on different sets of D-A pairs to provide direct structural insights, such as the location within the pore, host-guest interactions, and guest-guest orientation. For this purpose, we dissolved naphthalene-TCNQ or pyrene-TCNQ in dichloromethane (DCM) at a 1:1 ratio and soaked MOF-177 crystals in the solution for 3 days. UV-Vis spectroscopy reveals the difference in the absorption bands of the isolated molecules vs. D-A pairs in MOF pores. To confirm the presence of guest species inside the MOF and to determine the donor vs. acceptor ratio we obtained nuclear magnetic resonance (NMR) spectra. Interestingly, our preliminary results confirm that both naphthalene-TCNQ and pyrene-TCNQ pairs were accommodated inside the MOF but in different stoichiometric ratios. We also collected single crystal X-ray diffraction of the MOF crystals after being soaked after infiltration with D-A pairs. Structural refinement is underway to determine their position and interactions. Our approach provides new mechanistic insights and also produces new benchmark materials with long exciton lifetimes, which can be utilized to advance current photonic technologies. References Abou Taka, J. E. Reynolds Iii, N. C. Cole-Filipiak, M. Shivanna, C. J. Yu, P. L. Feng, et al. Phys. Chem. Chem. Phys. 2023, 25, 27065. Sun, Y. Wang, F. Yang, X. Zhang and W. Hu. Adv. Mater. 2019, 31, 1902328. Shivanna, Q.-Y. Yang, A. Bajpai, E. Patyk-Kazmierczak and M. J. Zaworotko, Nat. Commun. 2018, 9, 3080. K. Leong, M. E. Foster, B. M. Wong, E. D. Spoerke, D. Van Gough, J. C. Deaton, et al. J. Mat. Chem. A 2014, 2, 3389.

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Balakrishnan, Mini, Bernard P. Roques, Philip J. Fay, and Robert A. Bambara. "Template Dimerization Promotes an Acceptor Invasion-Induced Transfer Mechanism during Human Immunodeficiency Virus Type 1 Minus-Strand Synthesis." Journal of Virology 77, no. 8 (April 15, 2003): 4710–21. http://dx.doi.org/10.1128/jvi.77.8.4710-4721.2003.

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ABSTRACT The biochemical mechanism of template switching by human immunodeficiency virus type 1 (HIV-1) reverse transcriptase and the role of template dimerization were examined. Homologous donor-acceptor template pairs derived from the HIV-1 untranslated leader region and containing the wild-type and mutant dimerization initiation sequences (DIS) were used to examine the efficiency and distribution of transfers. Inhibiting donor-acceptor interaction was sufficient to reduce transfers in DIS-containing template pairs, indicating that template dimerization, and not the mere presence of the DIS, promotes efficient transfers. Additionally, we show evidence that the overall transfer process spans an extended region of the template and proceeds through a two-step mechanism. Transfer is initiated through an RNase H-facilitated acceptor invasion step, while synthesis continues on the donor template. The invasion then propagates towards the primer terminus by branch migration. Transfer is completed with the translocation of the primer terminus at a site distant from the invasion point. In our system, most invasions initiated before synthesis reached the DIS. However, transfer of the primer terminus predominantly occurred after synthesis through the DIS. The two steps were separated by 60 to 80 nucleotides. Sequence markers revealed the position of primer terminus switch, whereas DNA oligomers designed to block acceptor-cDNA interactions defined sites of invasion. Within the region of homology, certain positions on the template were inherently more favorable for invasion than others. In templates with DIS, the proximity of the acceptor facilitates invasion, thereby enhancing transfer efficiency. Nucleocapsid protein enhanced the overall efficiency of transfers but did not alter the mechanism.

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Lewis, Frederick D. "DNA photonics." Pure and Applied Chemistry 78, no. 12 (January 1, 2006): 2287–95. http://dx.doi.org/10.1351/pac200678122287.

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Short DNA duplexes can be stabilized by the presence of organic chromophores, which serve as hairpin linkers or end-capping groups. Capped hairpins possessing one or more base pairs form stable folded structures in aqueous solution. Increasing the number of base pairs separating the two chromophores increases both the distance between the two chromophores and the dihedral angle between their electronic transition dipoles. Thus, duplex DNA can serve as a helical scaffold for the study of electronic interactions between two chromophores. Three types of electronic interaction have been investigated: (a) exciton coupling (EC) between two identical chromophores, as probed by exciton-coupled circular dichroism (EC-CD); (b) fluorescence resonance energy transfer (FRET) between a fluorescent donor and acceptor; and (c) photoinduced electron transfer (PET) between an electron donor and acceptor. EC and the efficiency of fluorescence energy transfer are dependent upon both the distance and dihedral angle separating the two chromophores. Electron transfer occurs via both single-step superexchange and bridge-mediated hopping mechanisms, neither of which displays angular dependence. The competition between these mechanisms is dependent upon both the energetics of hole injection into the base-pair bridge and the distance between the donor and acceptor chromophores, superexchange dominating at short distance and hole hopping at longer distances.

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Zehe, A., E. Reynoso, and A. Ramírez. "Quenching of Luminescence Emission due to a Transient Bonding State of Donor-Acceptor Pairs at High Excitation Levels in GaAlAs Crystals Doped to Compensation." Materials Science Forum 480-481 (March 2005): 457–62. http://dx.doi.org/10.4028/www.scientific.net/msf.480-481.457.

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A new kind of a bound state has been identified at strong external excitation levels in semiconductors with high amphoteric doping, which is formed of a close donor-acceptor molecule and a neighboring second donor and/or acceptor. The recombination behavior of such a bound state is best described by AUGER-type transitions, reason for which this state is called an AUGER molecule. We have determined the existence region of such molecules in silicon-doped Ga1-xAlxAs with respect to excess carrier density and temperature by means of electron-beam excited luminescence spectroscopy at low and medium temperatures. The donor-acceptor pair radiation intensity is affected in a characteristic manner by the existence of the AUGER molecule state at elevated excitation levels and not too low temperatures. A computerized model calculation of corresponding rate coefficients turns out to be in good agreement with experimental results.

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