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Journal articles on the topic 'Receptor for anions and guanidine'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Kim, Won, Suban K. Sahoo, Gi-Dong Kim, and Heung-Jin Choi. "C 3v-symmetric anion receptors with guanidine recognition motifs for ratiometric sensing of fluoride." RSC Advances 6, no. 10 (2016): 7872–78. http://dx.doi.org/10.1039/c5ra26039f.

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Two new tripodal receptors 3 and 4 derived from a trindane framework having guanidine groups acting as hydrogen bond acceptors are synthesized and characterized for the selective recognition of anions.

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2

Goswami, Shyamaprosad, Subrata Jana, Rinku Chakrabarty, and Hoong-Kun Fun. "Recognition of anions and monocarboxylic acids by a fluorescent guanidine-based receptor." Supramolecular Chemistry 22, no. 3 (2009): 143–48. http://dx.doi.org/10.1080/10610270902980614.

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3

Shyamaprosad, Goswami, and Chakrabarty Rinku. "Di(ortho-hydroxybenzylidene)acetone as a new acid-base indicator and a chromogenic receptor for anions and guanidine." Journal of Indian Chemical Society Vol. 88, Apr 2011 (2011): 547–57. https://doi.org/10.5281/zenodo.5767016.

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Department of Chemistry, Bengal Engineering and Science University, Shibpur, Howrah-711 103, West Bengal, India <em>E-mail</em> : spgoswamical@yahoo.com Fax : 91-33-26682916 <em>Manuscript received 19 April 2010, revised 09 August 2010, accepted 16 August 2010</em> The development of a new simple acid-base indicator di(o-hydroxybenzylidene) acetone (1) is reported as a possible alternative to phenolphthalein and its performance has been compared with those of o-hydroxybenzylideneacetone (2) and <em>p</em>-hydroxybenzylideneacetone (3), two synthetic compounds, and curcumin (4), a natural produ

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4

Otón, Francisco, Arturo Espinosa, Alberto Tárraga, Carmen Ramírez de Arellano, and Pedro Molina. "[3.3]Ferrocenophanes with Guanidine Bridging Units as Multisignalling Receptor Molecules for Selective Recognition of Anions, Cations, and Amino Acids." Chemistry - A European Journal 13, no. 20 (2007): 5742–52. http://dx.doi.org/10.1002/chem.200601757.

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5

Xu, Si-Yu, Zhou-Yu Meng, Feng-Qi Zhao, and Xue-Hai Ju. "Density functional study of guanidine-azole salts as energetic materials." Canadian Journal of Chemistry 96, no. 10 (2018): 949–56. http://dx.doi.org/10.1139/cjc-2018-0106.

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A series of guanidine cations and azole anions were designed for use as energetic salts. Their geometrical structures were optimized by the density functional theory (DFT) method. The counter ions were matched by the similar magnitude of the electron affinity (EA) of the cation and the ionization potential (IP) of the anion. The densities, heats of formation, detonation parameters, and impact sensitivity were predicted. The incorporation of guanidine cations and diazole anions are favorable to form thermal stable salts except cation A1. The diaminoguanidine cation has greater impact on the den

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6

Moore, Graham J., Harry Ridway, Laura Kate Gadanec, et al. "Structural Features Influencing the Bioactive Conformation of Angiotensin II and Angiotensin A: Relationship between Receptor Desensitization, Addiction, and the Blood–Brain Barrier." International Journal of Molecular Sciences 25, no. 11 (2024): 5779. http://dx.doi.org/10.3390/ijms25115779.

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The N-terminal portion of the octapeptide angiotensin II (DRVYIHPF; AngII), a vasopressor peptide that favorably binds to, and activates, AngII type 1 receptor (AT1R), has an important role in maintaining bioactive conformation. It involves all three charged groups, namely (i) the N-terminal amino group cation, (ii) the Asp sidechain anion and (iii) the Arg guanidino cation. Neutralization of any one of these three charged groups results in a substantial reduction (<5%) in bioactivity, implicating a specialized function for this cluster. In contrast, angiotensin A (ARVYIHPF; AngA) has reduc

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7

Moore, Graham J., Jose M. Pires, Konstantinos Kelaidonis, et al. "Receptor Interactions of Angiotensin II and Angiotensin Receptor Blockers—Relevance to COVID-19." Biomolecules 11, no. 7 (2021): 979. http://dx.doi.org/10.3390/biom11070979.

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Angiotensin II (Ang II) may contain a charge relay system (CRS) involving Tyr/His/carboxylate, which creates a tyrosinate anion for receptor activation. Energy calculations were carried out to determine the preferred geometry for the CRS in the presence and absence of the Arg guanidino group occupying position 2 of Ang II. These findings suggest that Tyr is preferred over His for bearing the negative charge and that the CRS is stabilized by the guanidino group. Recent crystallography studies provided details of the binding of nonpeptide angiotensin receptor blockers (ARBs) to the Ang II type 1

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8

Peschke, Wolfgang, Petra Schiessl, Franz P. Schmidtchen, Peter Bissinger, and Annette Schier. "Building Blocks for Artificial Anion Receptors: Derivatives of Chiral Bicyclic Guanidines." Journal of Organic Chemistry 60, no. 4 (1995): 1039–43. http://dx.doi.org/10.1021/jo00109a041.

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9

Kim, Hyungbin, Byoung-jin Jeon, Sangsik Kim, YongSeok Jho, and Dong Soo Hwang. "Upper Critical Solution Temperature (UCST) Behavior of Coacervate of Cationic Protamine and Multivalent Anions." Polymers 11, no. 4 (2019): 691. http://dx.doi.org/10.3390/polym11040691.

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Complex coacervation is an emerging liquid/liquid phase separation (LLPS) phenomenon that behaves as a membrane-less organelle in living cells. Yet while one of the critical factors for complex coacervation is temperature, little analysis and research has been devoted to the temperature effect on complex coacervation. Here, we performed a complex coacervation of cationic protamine and multivalent anions (citrate and tripolyphosphate (TPP)). Both mixtures (i.e., protamine/citrate and protamine/TPP) underwent coacervation in an aqueous solution, while a mixture of protamine and sodium chloride d

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10

Ochirov, O. S., S. A. Stelmakh, M. N. Grigor’eva, V. O. Okladnikova, and D. M. Mognonov. "Synthesis and study of oligohexamethyleneguanidine hydroiodide as a radiopaque substance." Proceedings of Universities. Applied Chemistry and Biotechnology 11, no. 3 (2021): 491–96. http://dx.doi.org/10.21285/2227-2925-2021-11-3-491-496.

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Abstract: Diagnosis of complex injuries, such as splinter fractures and wounds, skull injuries accompanied by internal injuries that are inaccessible to visual control, presents the greatest difficulties during X-ray examination. Therefore, it is relevant to develop a drug that can help localize the site of a pathological lesion with high accuracy, relying only on the results of an X-ray study, which is possible when a reference point (substance) is applied to the patient’s skin. A radiopaque contrast compound based on an iodinated polymeric matrix with iodine as the contrasting component and

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11

Ali, Basharat, Xiao-Lei Li, Frédéric Gendron, Boris Le Guennic, and Jinkui Tang. "A new class of DyIII-SIMs associated with a guanidine-based ligand." Dalton Transactions 50, no. 15 (2021): 5146–53. http://dx.doi.org/10.1039/d1dt00260k.

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The diverse relaxation dynamics of a series of Dy<sup>III</sup>-based SIMs resulting from the coordinated molecules and counter anions were elucidated by structural analysis, magnetic investigations and ab initio calculations.

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12

Hoepfner, Veronika, Ulli Englert, and Richard Dronskowski. "Synthesis and Crystal Structure Determination of a Guanidine Adduct of Sodium Guanidinate, NaCN3H4(CN3H5)2." Zeitschrift für Naturforschung B 66, no. 9 (2011): 975–78. http://dx.doi.org/10.1515/znb-2011-0918.

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Well-grown single crystals of NaCN3H4(CN3H5)2 were synthesized from guanidine and sodium hydride. The new compound crystallizes in the monoclinic space group P21/n (no. 14) with Z = 4 and a = 6.2007(4), b = 9.6261(8), c = 15.7630(11) A° and β = 93.783(3)◦ at 293 K. The asymmetric unit comprises two sodium cations on special positions, one guanidinate anion and two symmetry-independent guanidine molecules. The structure is built up from columns of facesharing NaN6 octahedra oriented along the crystallographic a axis. The coordinating organic ligand anions and molecules are connected by hydrogen

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13

Santos Vieira, Ines dos, and Sonja Herres-Pawlis. "Novel Guanidine-Quinoline Hybrid Ligands and the Application of their Zinc Complexes in Lactide Polymerisation." Zeitschrift für Naturforschung B 67, no. 4 (2012): 320–30. http://dx.doi.org/10.1515/znb-2012-0405.

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The syntheses of the three new guanidine-quinoline hybrid ligands TMGmqu, DMEGmqu and TMGtbqu are reported. Zinc chlorido and triflato complexes with these ligands were obtained and structurally characterised by X-ray crystallography. In the chlorido complexes the zinc atom is coordinated by two chlorido ligands and the bidentate guanidine ligand in a distorted tetrahedron. Using zinc triflate, tetrahedral bis(chelate) complexes are formed, and the triflate anions serve only for charge compensation. All reported complexes show activity in the polymerisation of rac-lactide, with the chlorido co

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14

Jänne, O. A., J. J. Palvimo, P. Kallio, M. Mehto, Y. B. Xie, and Y. P. Sui. "Production of recombinant androgen receptor in a heterologous expression system." Clinical Chemistry 39, no. 2 (1993): 346–52. http://dx.doi.org/10.1093/clinchem/39.2.346.

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Abstract To facilitate detailed studies of androgen receptor, we have produced a full-length receptor protein and some of its deletion mutants in Spodoptera frugiperda (Sf9) insect cells, using the baculovirus expression system. Recombinant baculovirus DNA-infected Sf9 cells expressed these proteins in very high quantities, which represented as much as 30-40% of total insect cell protein at 72 h after infection. Only &lt; 1% of the recombinant protein was soluble in low-salt buffers; the majority formed electron-dense cytoplasmic aggregates 30-40 nm in diameter. These aggregates could be s

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15

Garoufalis, Christos S., Iosif Galanakis, Zaiping Zeng, David B. Hayrapetyan, and Sotirios Baskoutas. "Structural and Electronic Properties of Small Perovskite Nanoparticles of the Form ABX3 (A = MA, DEA, FA, GA, B = Pb, Sn, X = Cl, Br, I)." Electronic Materials 2, no. 3 (2021): 382–93. http://dx.doi.org/10.3390/electronicmat2030026.

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Using a combination of first principles and semiempirical calculation, we explore the structural, electronic, and optical properties of a wide range of perovskite (ABX3) nanoparticle of different size and composition. The variations of the BX3 backbone structure considered include all possible combinations of the cations B=Pb,Sn and the anions X=Cl,Br,I, while the interstitial cation A is either methylamonium (MA), or formamidinium (FA), or guanidine amine (GA), or dimethylamine (DEA). Our results indicate that the orientational disorder of the A moieties may affect the structural and electron

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16

Singh, Prabal, S. Yugandar, S. Kumar, H. Ila, and H. Junjappa. "Synthesis of Novel Five- and Six-Membered Ferrocene-Containing Heterocycles and Heteroaromatics via Cyclocondensation of 1-Ferrocenyl-3,3-bis(methylthio)prop-2-en-1-one with Various Bifunctional Nucleophiles." Synthesis 49, no. 12 (2017): 2700–2710. http://dx.doi.org/10.1055/s-0036-1588966.

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Synthesis and reactions of 1-ferrocenyl-3,3-bis(methylthio)prop-2-en-1-one as a versatile 1,3-bielectrophilic synthon leading to a range of novel ferrocene-containing five- and six-membered heterocycles and heteroaromatics has been reported. Thus its cyclocondensation with various bifunctional heteronucleophiles, such as hydrazine, phenylhydrazine, hydroxylamine, guanidine, and amidine, affords a range of ferrocene-substituted pyrazoles, oxazoles, and pyrimidines in highly regioselective manner. Synthesis of few ferrocenyl-substituted pyridines and thiophenes has also been described. Similar

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17

Mohammed, Z. M., Z. K. Haruna, Z. I. Abdullahi, et al. "In-silico comparative study of three (3) bioactive compounds from methanol extracts of Combretum micranthum leaf, and diazepam with Gabaa receptor molecule." Bayero Journal of Pure and Applied Sciences 12, no. 1 (2020): 235–41. http://dx.doi.org/10.4314/bajopas.v12i1.37s.

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Stress affects monoamine neurotransmitter in the central nervous system such as GABA (a major inhibitory neurotransmitter in the brain). GABAA receptor is hetero-oligomeric Cl-channel that is elective blocked by the alkaloid, bicuculline and modulated by steroids, barbiturates and benzodiazepines. The anticonvulsant activity of Diazepam may be mediated by enhancement of inhibition involving gamma-aminobutyric acid (GABA). Combretum micranthum is one of the maximum effective medicinal plants of therapeutic importance. Thus this study is to examine the effect of Combretum micranthum methanol lea

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18

Xie, Huifang, and Ming Wah Wong. "Computational Design of Thiourea-based Cyclophane Sensors for Small Anions." Australian Journal of Chemistry 65, no. 3 (2012): 303. http://dx.doi.org/10.1071/ch11389.

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The host–guest binding properties of a tri-thiourea cyclophane receptor (1) with several common anions have been investigated using density functional theory (DFT) and molecular dynamics calculations. Receptor 1 is predicted to be an effective receptor for binding small halogen and Y-shaped (NO3– and AcO–) anions in the gas phase, cyclohexane and chloroform. The calculated order of anion binding affinity for the receptor 1 in chloroform is F– > Cl– > AcO– > NO3– >Br– > H2PO4– > HSO4–. The binding free energies are strongly influenced by a dielectric solvent medium. The struct

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19

Russ, Tiffany H., Avijit Pramanik, Maryam E. Khansari, Bryan M. Wong, and Alamgir Hossain. "A Quinoline Based bis-Urea Receptor for Anions: A Selective Receptor for Hydrogen Sulfate." Natural Product Communications 7, no. 3 (2012): 1934578X1200700. http://dx.doi.org/10.1177/1934578x1200700307.

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A dipodal bis-urea receptor has been synthesized from the reaction of 8-amino quinoline and 1,4-phenylene diisocyanate in dichloromethane, and the anion binding ability of the receptor has been studied using fluoride, chloride, bromide, iodide, perchlorate, nitrate, dihydrogen phosphate and hydrogen sulfate by UV-Vis titrations in DMSO. The results show that the receptor binds each of the anions with a 1:1 stoichiometry, showing high affinity and moderate selectivity for hydrogen sulfate among the anions studied. Ab initio calculations based on density functional theory (DFT) suggest that an a

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20

McLaughlin, Jay P., Ramanjaneyulu Rayala, Ashley J. Bunnell та ін. "Bis-Cyclic Guanidine Heterocyclic Peptidomimetics as Opioid Ligands with Mixed μ-, κ- and δ-Opioid Receptor Interactions: A Potential Approach to Novel Analgesics". International Journal of Molecular Sciences 23, № 17 (2022): 9623. http://dx.doi.org/10.3390/ijms23179623.

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The design and development of analgesics with mixed-opioid receptor interactions has been reported to decrease side effects, minimizing respiratory depression and reinforcing properties to generate safer analgesic therapeutics. We synthesized bis-cyclic guanidine heterocyclic peptidomimetics from reduced tripeptides. In vitro screening with radioligand competition binding assays demonstrated variable affinity for the mu-opioid receptor (MOR), delta-opioid receptor (DOR), and kappa-opioid receptor (KOR) across the series, with compound 1968-22 displaying good affinity for all three receptors. C

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21

Kim, Jaehyeon, Seung Hyeon Kim, Nam Jung Heo, Benjamin P. Hay, and Sung Kuk Kim. "Molecular Pincers Using a Combination of N-H and C-H Donors for Anion Binding." International Journal of Molecular Sciences 24, no. 1 (2022): 163. http://dx.doi.org/10.3390/ijms24010163.

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A naphthalene imide (1) and a naphthalene (2) bearing two pyrrole units have been synthesized, respectively, as anion receptors. It was revealed by 1H NMR spectral studies carried out in CD3CN that receptors 1 and 2 bind various anions via hydrogen bonds using both C-H and N-H donors. Compared with receptor 2, receptor 1 shows higher affinity for the test anions because of the enhanced acidity of its pyrrole NH and naphthalene CH hydrogens by the electron-withdrawing imide substituent. Molecular mechanics computations demonstrate that the receptors contact the halide anions via only one of the

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22

Chen, Zhi-Hong, Yong-Bing He, Chen-Guang Hu, Xiao-Huan Huang, and Ling Hu. "Synthesis and Chiral Recognition Properties of a Novel Colorimetric Chiral Sensor for Carboxylic Anions." Australian Journal of Chemistry 61, no. 4 (2008): 310. http://dx.doi.org/10.1071/ch08009.

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Chiral colorimetric sensor 4 has been synthesized, and the structure characterized by IR and 1H NMR spectroscopy, mass spectrometry, and elemental analysis. The chiral recognition of the receptor was studied by 1H NMR and UV-vis spectroscopy. The results of non-linear curve fitting indicate that the receptor 4 and l- or d-mandelate and alanine anions form a 1:1 stoichiometric complex. The obvious colour change of receptor 4 can be observed by the naked eye when the enantiomers of mandelate and alanine anions are added, which demonstrates that receptor 4 may be used as the colorimetric sensor f

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23

Zaleskaya, Marta, Łukasz Dobrzycki, and Jan Romański. "Highly Efficient, Tripodal Ion-Pair Receptors for Switching Selectivity between Acetates and Sulfates Using Solid–Liquid and Liquid–Liquid Extractions." International Journal of Molecular Sciences 21, no. 24 (2020): 9465. http://dx.doi.org/10.3390/ijms21249465.

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A tripodal, squaramide-based ion-pair receptor 1 was synthesized in a modular fashion, and 1H NMR and UV-vis studies revealed its ability to interact more efficiently with anions with the assistance of cations. The reference tripodal anion receptor 2, lacking a crown ether unit, was found to lose the enhancement in anion binding induced by presence of cations. Besides the ability to bind anions in enhanced manner by the “single armed” ion-pair receptor 3, the lack of multiple and prearranged binding sites resulted in its much lower affinity towards anions than in the case of tripodal receptors

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Barišić, D., N. Cindro, N. Vidović, N. Bregović, and V. Tomišić. "Protonation and anion-binding properties of aromatic sulfonylurea derivatives." RSC Advances 11, no. 39 (2021): 23992–4000. http://dx.doi.org/10.1039/d1ra04738h.

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25

Kolesnikov, Grigory V., Konstantin E. German, Gayane Kirakosyan, et al. "Macrocyclic receptor for pertechnetate and perrhenate anions." Organic & Biomolecular Chemistry 9, no. 21 (2011): 7358. http://dx.doi.org/10.1039/c1ob05873h.

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26

Meenongwa, Atittaya, Unchulee Chaveerach, and Alexander J. Blake. "Methanol[1-(methoxymethanimidoyl)-2-(pyridin-2-ylmethyl)guanidine]bis(perchlorato)copper(II)." Acta Crystallographica Section C Crystal Structure Communications 68, no. 6 (2012): m143—m146. http://dx.doi.org/10.1107/s0108270112015843.

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The title complex, [Cu(ClO4)2(C9H13N5O)(CH3OH)], was synthesized from a methanolysis reaction ofN-(methylpyridin-2-yl)cyanoguanidine (L3) and copper(II) perchlorate hexahydrate in a 1:1 molar ratio. The CuIIion is six-coordinated by an N3O3donor set which confers a highly distorted and asymmetric octahedral geometry. Three N-donor atoms from the chelating 1-(methoxymethanimidoyl)-2-(pyridin-2-ylmethyl)guanidine (L3m) ligand and one O atom from the methanol molecule define the equatorial plane, with two perchlorate O atoms in the apical sites, one of which has a long Cu—O bond of 2.9074 (19) Å.

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27

Wang, Xiaohua, Mei Tong, Shashi Chinta, J. Usha Raj, and Yuansheng Gao. "Hypoxia-induced reactive oxygen species downregulate ETB receptor-mediated contraction of rat pulmonary arteries." American Journal of Physiology-Lung Cellular and Molecular Physiology 290, no. 3 (2006): L570—L578. http://dx.doi.org/10.1152/ajplung.00262.2005.

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Production of reactive oxygen species (ROS) may be increased during hypoxia in pulmonary arteries. In this study, the role of ROS in the effect of hypoxia on endothelin (ET) type B (ETB) receptor-mediated vasocontraction in lungs was determined. In rat intrapulmonary (∼0.63 mm ID) arteries, contraction induced by IRL-1620 (a selective ETB receptor agonist) was significantly attenuated after 4 h of hypoxia (30 mmHg Po2) compared with normoxic control (140 mmHg Po2). The effect was abolished by tiron, a scavenger of superoxide anions, but not by polyethylene glycol (PEG)-conjugated catalase, whi

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28

Qi, Xiao-Ni, Hong-Qiang Dong, Hai-Long Yang, et al. "Tailoring an HSO4− anion hybrid receptor based on a phenazine derivative." Photochemical & Photobiological Sciences 19, no. 10 (2020): 1373–81. http://dx.doi.org/10.1039/d0pp00159g.

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A hybrid PD-based receptor was tailored for capturing HSO<sub>4</sub><sup>−</sup> anions. It could display not only a preferable sensitivity with a “turn–off” fluorescence response, but also a strong anti-interference toward other common anions.

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29

Sola, Antonia, Alberto Tárraga, and Pedro Molina. "A ferrocenyl-guanidine derivative as a highly selective electrochemical and colorimetric chemosensor molecule for acetate anions." Dalton Transactions 41, no. 27 (2012): 8401. http://dx.doi.org/10.1039/c2dt30632h.

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Tiritiris, Ioannis, Jochen Mezger, Edmont V. Stoyanov та Willi Kantlehner. "Orthoamide und Iminiumsalze, LXXI [1]. Zur Fixierung von Kohlendioxid mit organischen Basen (Teil 2) – Reaktionen von Guanidinen und ω-Aminoalkyl-guanidinen mit Kohlendioxid/ Orthoamides and IminiumSalts, LXXI [1]. Capturing of Carbon Dioxidewith OrganicBases (Part 2) – Reactions of Guanidines and ω-Aminoalkyl-guanidines with Carbon Dioxide". Zeitschrift für Naturforschung B 66, № 4 (2011): 407–18. http://dx.doi.org/10.1515/znb-2011-0411.

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The guanidines 1, 4, 6, 8, 10, and 12 react with carbon dioxide in the presence of traces of water to give the guanidinium hydrogen carbonates 3, 5, 7, 9, 11, and 13. The crystal structures of the salts reveal the presence of centrosymmetric hydrogen carbonate ion dimers, which are connected by O-H・・・O hydrogen bonds. Additionally the cations are associated with the anions via N-H・・・O hydrogen bonds. The reaction of the N-(aminoalkyl)guanidine 14 with CO2 in the presence of traces of water affords a stable hygroscopic carbamic acid as the hydrogen carbonate salt 15. In the crystal structur

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Mateus, Pedro, Rita Delgado, Vânia André, and M. Teresa Duarte. "Sulfate recognition by a hexaaza cryptand receptor." Organic & Biomolecular Chemistry 13, no. 3 (2015): 834–42. http://dx.doi.org/10.1039/c4ob02027h.

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32

Ogurtsova, Ekaterina K., Tatyana N. Makarieva, Yuliya V. Korolkova, et al. "New Derivatives of Natural Acyclic Guanidine Alkaloids with TRPV Receptor-Regulating Properties." Natural Product Communications 10, no. 7 (2015): 1934578X1501000. http://dx.doi.org/10.1177/1934578x1501000708.

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The guanidine alkaloids, dihydropulchranin A (2), prepared from pulchranin A from the sponge Monanchora pulchra, and hexadecylguanidine (3), a synthetic analog of pulchranins, were studied for their TRPV channel-regulating activities. Compound 2 was active as an inhibitor of rTRPV1 and hTRPV3 receptors with EC50 values of 24.3 and 59.1 μM, respectively. Hexadecylguanidine (3) was not active against these receptors.

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Wang, Bei, Pei-Zhi Zhang, Xin Chen, Ai-Quan Jia, and Qian-Feng Zhang. "Syntheses and crystal structures of guanidine hydrochlorides with two Schiff base functions as efficient colorimetric and selective sensors for fluoride." Zeitschrift für Naturforschung B 73, no. 8 (2018): 601–9. http://dx.doi.org/10.1515/znb-2018-0102.

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AbstractA series of guanidinium chloride derivatives have been synthesized by condensation of 1,3-diaminoguanidine monohydrochloride with heteroaromatic formaldehydes in good yields. All compounds were characterized by nuclear magnetic resonances and infrared spectroscopies, and the molecular structures of four compounds were determined by single crystal X-ray diffraction. The optical properties of these guanidinium chloride derivatives with fluoride anions were investigated, showing selective color changes from colorless to yellow or orange, red-shifted in the ultraviolet/visible absorption s

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Wu, Jin-Long, Yong-Bing He, Lan-Hua Wei, Ling-Zhi Meng, Ting-Xian Yang, and Xin Liu. "A New Two-Armed Colorimetric Chemosensor for Fluoride." Australian Journal of Chemistry 58, no. 1 (2005): 53. http://dx.doi.org/10.1071/ch04228.

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The neutral anion receptor 1 was synthesized by an easy method with high yield. The binding properties of anions with 1 were examined by UV-vis and 1H NMR spectroscopy. Receptor 1 can form a 1 : 2 complex with F−, and 1 : 1 complexes with AcO− and H2PO4− anions, respectively, by multiple hydrogen-bonding interactions. There is an observable colour change for the complex formed by 1 and F−.

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35

Zenkevičs, Henriks, Ilze Vosekalna, and Vija Vose. "Significance of arginine radicals for sturgeon gonadotropin secondary structure and function." Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences. 64, no. 3-4 (2010): 144–48. http://dx.doi.org/10.2478/v10046-010-0031-8.

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Significance of arginine radicals for sturgeon gonadotropin secondary structure and function Guanidine groups of arginine side chains were selectively chemically modified with 1,2-cyclohexanedione (CHD) in sturgeon (Acipenser güldenstädti Br.) gonadotropic hormone (GTH) and in its subunits. It was found that only two of the six guanidines were accessible for the reagent and each of the two modified groups was bound to an individual subunit. The results showed that both modified groups were located on the surface of the hormone dimeric molecule. CD-spectroscopy of the modified hormonal preparat

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Schmidtchen, F. P. "An artificial molecular receptor molecule for ditopic anions." Tetrahedron Letters 27, no. 18 (1986): 1987–90. http://dx.doi.org/10.1016/s0040-4039(00)84428-7.

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37

Hayashida, Osamu, Alexander Shivanyuk, and Julius Rebek, Jr. "Molecular Encapsulation of Anions in a Neutral Receptor." Angewandte Chemie International Edition 41, no. 18 (2002): 3423–26. http://dx.doi.org/10.1002/1521-3773(20020916)41:18<3423::aid-anie3423>3.0.co;2-x.

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38

Kundu, Sanchita, Tochukwu Kevin Egboluche, Zehra Yousuf, and Md Alamgir Hossain. "Spectroscopic and Colorimetric Studies for Anions with a New Urea-Based Molecular Cleft." Chemosensors 9, no. 10 (2021): 287. http://dx.doi.org/10.3390/chemosensors9100287.

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A new simple urea-based dipodal molecular cleft (L) has been synthesized and studied for its binding affinity for a variety of anions by 1H-NMR, UV-Vis and colorimetric techniques in DMSO-d6 and DMSO, respectively. The results from titration studies suggest that the receptor forms a 1:2 complex with each of the anions used via hydrogen bonding interactions and exhibits strong selectivity for fluoride among halides, showing the binding affinity in the order of fluoride > chloride > bromide > iodide; meanwhile, it displays moderate selectivity for acetate among oxoanions, showing the bi

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39

Jagleniec, Damian, Marcin Wilczek, and Jan Romański. "Tripodal, Squaramide-Based Ion Pair Receptor for Effective Extraction of Sulfate Salt." Molecules 26, no. 9 (2021): 2751. http://dx.doi.org/10.3390/molecules26092751.

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Combining three features—the high affinity of squaramides toward anions, cooperation in ion pair binding and preorganization of the binding domains in the tripodal platform—led to the effective receptor 2. The lack of at least one of these key elements in the structures of reference receptors 3 and 4 caused a lower affinity towards ion pairs. Receptor 2 was found to form an intramolecular network in wet chloroform, which changed into inorganic–organic associates after contact with ions and allowed salts to be extracted from an aqueous to an organic phase. The disparity in the binding mode of 2

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40

Coles, Martyn P., and Peter B. Hitchcock. "Bicyclic Guanidinates in Mono- and Di-Valent Metal Complexes, Including Group 1/2 and Group 1/12 Heterometallic Systems." Australian Journal of Chemistry 66, no. 10 (2013): 1124. http://dx.doi.org/10.1071/ch12560.

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Complexes containing mono-, di-, and mixed mono-/di-valent metal centres supported by the [hpp]– anion (hppH = 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine) are reported. Amine elimination from Mn(N{SiMe3}2)2 using the neutral guanidine is a clean route to the heteroleptic compound [Mn(hpp)(N{SiMe3}2)]2. Addition of 18-crown-6 to a solution of the hpp– potassium salt (hppK) enables the first potassium derivative of [hpp]– to be structurally analysed, showing that the crown ether restricts aggregation to afford a monometallic structure. Mixed lithium–magnesium and lithium–zinc compounds o

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41

Wong, Erick CN, Tristan A. Reekie, Eryn L. Werry, James O'Brien-Brown, Sarah L. Bowyer, and Michael Kassiou. "Pharmacological evaluation of a novel series of urea, thiourea and guanidine derivatives as P2X7 receptor antagonists." Bioorganic & Medicinal Chemistry Letters 27, no. 11 (2017): 2439–42. https://doi.org/10.1016/j.bmcl.2017.04.005.

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<strong>Abstract</strong> We report on P2X<sub>7</sub> receptor antagonists based on a lead adamantly-cyanoguanidine-aryl moiety. We have investigated the importance of the central cyanoguanidine moiety by replacing it with urea, thiourea or guanidine moieties. We have also investigated the linker length between the central moiety and the aryl portion. All compounds were assessed for their inhibitory potency in a pore-formation dye uptake assay at the P2X<sub>7</sub> receptor. None of the compounds resulted in an improved potency illustrating the importance of the cyanoguanidine moiety in this

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42

Zhigulin, Arseniy S., and Oleg I. Barygin. "Mechanisms of NMDA Receptor Inhibition by Sepimostat—Comparison with Nafamostat and Diarylamidine Compounds." International Journal of Molecular Sciences 24, no. 21 (2023): 15685. http://dx.doi.org/10.3390/ijms242115685.

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N-methyl-D-aspartate (NMDA) receptors are inhibited by many amidine and guanidine compounds. In this work, we studied the mechanisms of their inhibition by sepimostat—an amidine-containing serine protease inhibitor with neuroprotective properties. Sepimostat inhibited native NMDA receptors in rat hippocampal CA1 pyramidal neurons with IC50 of 3.5 ± 0.3 µM at −80 mV holding voltage. It demonstrated complex voltage dependence with voltage-independent and voltage-dependent components, suggesting the presence of shallow and deep binding sites. At −80 mV holding voltage, the voltage-dependent compo

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Kantlehner, Willi, Ioannis Tiritiris, Markus Vettel та Wolfgang Frey. "Orthoamide und Iminiumsalze, IIC. Darstellung von N-(ω-Ammonioalkyl)-N,N′,N′,N″,N″-peralkylierten Guanidiniumsalzen und N-(ω-Aminoalkyl)-N′,N′,N″,N″-tetramethylguanidinen". Zeitschrift für Naturforschung B 75, № 6-7 (2020): 665–84. http://dx.doi.org/10.1515/znb-2019-0229.

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AbstractN,N,N′,N′-Tetraalkylchlorformamidiniumchlorides 1a, b react with ω-dimethylaminoalkylamines 19, 20 to give mixtures of N-(ω-dimethylammonioalkyl)-guanidinium salts 12, 13 and N-(ω-dimethylaminoalkyl)-guanidinium salts 21, 22. These mixtures are transformed to mixtures of the ureas 15, 17 and N-(ω-dimethylaminoalkyl)-guanidines 23, 25 on treatment with aqueous sodium hydroxide. The reaction of N-(3-dimethylammoniopropyl)-guanidin 25a with dimethylsulfate in a molar ratio of 1:1 delivers a mixture of the N-(3-dimethylaminopropyl)-N,N,N′,N′,N″,N″-pentamethyl-guanidinium salt 29a and the N

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44

Pandian, Thiravidamani Senthil, Yusun Choi, Venkatesan Srinivasadesikan, Ming-Chang Lin, and Jongmin Kang. "A dihydrogen phosphate selective anion receptor based on acylhydrazone and pyrazole." New Journal of Chemistry 39, no. 1 (2015): 650–58. http://dx.doi.org/10.1039/c4nj01063a.

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A novel chromogenic anion receptor 1 based on acylhydrazone and pyrazole has been designed and synthesized. Receptor 1 forms stable 1 : 1 complexes with dihydrogen phosphate and other halide anions in DMSO solution.

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Vavilova, Alena A., and Ivan I. Stoikov. "p-tert-Butylthiacalix[4]arenes functionalized by N-(4’-nitrophenyl)acetamide and N,N-diethylacetamide fragments: synthesis and binding of anionic guests." Beilstein Journal of Organic Chemistry 13 (September 13, 2017): 1940–49. http://dx.doi.org/10.3762/bjoc.13.188.

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New p-tert-butylthiacalix[4]arenes, which are mono-, 1,2-di- and tetrasubstituted at the lower rim containing N-(4’-nitrophenyl)acetamide and N,N-diethylacetamide groups in cone and partial cone conformations have been synthesized. Their complexation ability towards a number of tetrabutylammonium salts n-Bu4NX (X = F−, Cl−, Br−, I−, CH3CO2 −, H2PO4 −, NO3 −) was studied by UV spectroscopy. The effective receptor for the anions studied as well as selective receptors for F−, CH3CO2 − and H2PO4 − ions, which based on the synthesized thiacalix[4]arenes, have been obtained. It was shown that p-tert

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46

Decato, Daniel A., Asia Marie S. Riel, and Orion B. Berryman. "Anion Influence on the Packing of 1,3-Bis(4-Ethynyl-3-Iodopyridinium)-Benzene Halogen Bond Receptors." Crystals 9, no. 10 (2019): 522. http://dx.doi.org/10.3390/cryst9100522.

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Rigid and directional arylethynyl scaffolds have been widely successful across diverse areas of chemistry. Utilizing this platform, we present three new structures of a dicationic 1,3-bis(4-ethynyl-3-iodopyridinium)-benzene halogen bonding receptor with tetrafluoroborate, nitrate, and hydrogen sulfate. Structural analysis focused on the receptor conformation, anion shape, solvation, and long range packing of these systems. Coupled with our previously reported structures, we concluded that anions can be classified as building units within this family of halogen bonding receptors. Two kinds of a

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47

Belén Jiménez, M., Victoria Alcázar, Rafael Peláez, Francisca Sanz, Ángel L. Fuentes de Arriba, and M. Cruz Caballero. "Bis-amidocarbazolyl urea receptor for short-chain dicarboxylate anions." Org. Biomol. Chem. 10, no. 6 (2012): 1181–85. http://dx.doi.org/10.1039/c1ob06540h.

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48

Linsenbardt, Andrew J., Mariangela Chisari, Andrew Yu, Hong-Jin Shu, Charles F. Zorumski, and Steven Mennerick. "Noncompetitive, Voltage-Dependent NMDA Receptor Antagonism by Hydrophobic Anions." Molecular Pharmacology 83, no. 2 (2012): 354–66. http://dx.doi.org/10.1124/mol.112.081794.

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49

Kim, Yeon-Hwan, and Jong-In Hong. "Carbamate-appended Zn-porphyrin: a neutral receptor for anions." Tetrahedron Letters 41, no. 22 (2000): 4419–23. http://dx.doi.org/10.1016/s0040-4039(00)00671-7.

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50

Plested, Andrew J. R., and Mark L. Mayer. "Structure and Mechanism of Kainate Receptor Modulation by Anions." Neuron 53, no. 6 (2007): 829–41. http://dx.doi.org/10.1016/j.neuron.2007.02.025.

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