1194-04-3Relevant articles and documents
Preparation and in vitro evaluation of monoquaternary inhibitors of brain cholinesterases
Jun, Daniel,Paar, Martin,Binder, Jiri,Marek, Jan,Pohanka, Miroslav,Stodulka, Petr,Kuca, Kamil
, p. 500 - 503 (2009)
Acetylcholinesterase inhibitors are currently of high interest due to the many reasons. Among them, Alzheimer's disease drugs are of great interest. In this study, eleven monoquaternary pyridinium salts substituted by different groups (electron donors and
A Complete Experimental Assessment of Franck-Condon Structural Effects for an Irreversible Outer-Sphere Electron-Transfer Reaction: Applications of Time-Dependent Raman Scattering Theory to the One-Electron Reduction of 4-Cyano-N-methylpyridinium
Blackbourn, Robert L.,Johnson, Christopher S.,Hupp, Joseph T.,Bryant, Mark A.,Sobocinski, Raymond L.,et al.
, p. 10535 - 10537 (1991)
A complete experimental description of the vibrational Franck-Condon barrier to the one-electron reduction of 4-cyano-N-methylpyridinium cation (NC-py-Ch3+) has been obtained.Because of the chemical irreversibility of the electron transfer, the reaction is not readily amenable to study by conventional structural methods.The approach successfully employed here, however, was a time-dependent analysis of near-resonant Raman scattering where resonance was achieved by pairing the cation to iodide anion; the pairing gives rise to a weak (ε = 565 M-1cm-1) outer-sphere charge-transfer band centered at 428 nm in acetonitrile as solvent.The time-dependent analysis of scattering yields vibrational frequencies, coordinate displacements, and single-mode barrier contributions for each of 13 modes involved in outer-sphere electron transfer.Depolarization measurements, excitation profiles, and scattering studies with the nonchromophoric +, Cl-> ion pair confirm that the vibrational structural data pertain directly to the outer-sphere charge-transfer reaction rather than to higher lying electronic transitions.
Menschutkin Reactions of Bicyclic Aliphatic Amines and of Pyridine Derivatives with Methyl Iodide. Extended Broensted Treatments and Isokinetic Relationships in Acetonitrile-Methanol
Kondo, Yasuhiko,Uematsu, Ryoichi,Nakamura, Yoshinobu,Kusabayashi, Shigekazu
, p. 1219 - 1224 (1988)
The rate constants, activation parameters for the Menschutkin reactions for five bases with methyl iodide, and the enthalpies of solution for the relevant species of the reactions have been determined in acetonitrile-methanol.The bases are quinuclidine, 1,4-diazabicyclooctane, and 4-cyano-, 4-t-butyl-, and 4-dimethylamino-pyridine.The coefficients of empirical energy correlations defined in terms of 'more physical' energies, extended Broensted treatments, αphys' and isokinetic temperatures, βphys' have been determined for these reactions.Discussion is provided on the physical meaning of these coefficients in relation to the characteristics of the activated complex.
Perovskite solar cell additive based on cyanopyridine ionic liquid and applications thereof
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Paragraph 0061-0064, (2020/03/09)
The invention relates to a perovskite solar cell additive based on a cyanopyridine ionic liquid and applications thereof. The chemical structural formula of the additive is represented in the description, in the formula, n represents an integer from 0 to 9; and Z represents Br, I, Cl, BF4, PF6, or TFSI. A special chemical structure is designed so that a cyano group is connected to a pyridine ring;due to the strong polarity of the cyano group, the morphology of a perovskite film can be controlled during the growth process, the prepared grains have a greater size; at the same time, due to the synergistic effect between the cyano group and pyridine cations, the internal defects in the perovskite film are reduced; and the prepared perovskite film has a very good fluorescent property.
Mixed halide hybrid halobismuthates and their in situ transformations
Kotov, Vitalii Yu.,Ilyukhin, Andrey B.,Buikin, Petr A.,Yorov, Khursand E.
, p. 537 - 540 (2019/10/28)
During a formation of four mixed hybrid halobismuthates (two of them have new structures) from solutions containing both Br? and I? ions, solid products enriched with iodine were isolated. Either oxidation or drying of mother liquors resulted in products with even higher iodine contents, up to pure iodobismuthates. All the compounds were characterized by a set of comprehensive methods (NMR, X-ray, DRS, etc.).
Efficient macrocyclization achieved via conformational control using intermolecular noncovalent π-cation/arene interactions
Bolduc, Philippe,Jacques, Alexandre,Collins, Shawn K.
supporting information; experimental part, p. 12790 - 12791 (2010/11/04)
Quinolinium salt 3 is an effective additive that acts as a conformation control element (CCE) to promote macrocyclization to form rigid cyclophanes via olefin metathesis or Glaser-Hay coupling, which do not cyclize in the absence of the additive. The additives are easily synthesized and highly modifiable and have solubility profiles which allow for simple recovery via filtration.
Excellent correlation between substituent constants and pyridinium N-methyl chemical shifts
Huang, Sha,Wong, Jesse C.S.,Leung, Adam K.C.,Chan, Yee Man,Wong, Lili,Fernendez, Myrien R.,Miller, Amanda K.,Wu, Weiming
experimental part, p. 5018 - 5020 (2009/12/01)
Substituents on the pyridinium ring of N-methylpyridinium derivatives, especially those on the 2- or 4-position, have a large effect on the 1H and 13C NMR chemical shifts of the N-methyl group. Reasonable correlations between the chemical shift changes and the resonance substituent constants are observed. The dual substituent parameter approach provides an excellent correlation when a combination of polar and resonance substituent constants is employed.
Second-order hyperpolarizability of pyridinium cations
Anwar,Duan, Xuan-Ming,Komatsu, Kyoji,Okada, Shuji,Matsuda, Hiro,Oikawa, Hidetoshi,Nakanishi, Hachiro
, p. 247 - 248 (2007/10/03)
The second-order hyperpolarizability (β) of pyridinium cations with cutoff (λco) shorter than 400 nm were studied by semiempirical calculation and the hyper-Rayleigh scattering (HRS) technique. The β value of 4-dimethylaminopyridinium (λco= 390 nm) was evaluated to be about 1.5 times larger than that of p-nitroaniline (λco= 473 nm) in methanolic solution using 1064 nm light as a fundamental beam.
Shape-Selective Assemblies of Charge-Transfer Complexes as Molecular Probes for Water Adsorption in Zeolites
Yoon, K. B.,Huh, T. J.,Kochi, J. K.
, p. 7042 - 7053 (2007/10/02)
The supercage of zeolite-Y and the restricted channels of zeolite-L, mordenite, and mazzite act as shape-selective hosts to a series of brightly colored charge-transfer complexes +, D> assembled in situ by the intercalation of various aromatic donors (D) into the ion-exchanged (colorless) zeolites with different pyridinium acceptors (A+).Upon the deliberate introduction of water (vapor) into the variously colored zeolites, the diffuse reflectance spectra suffer pronounced spectral shifts of the charge-transfer bands, the magnitude of ΔhνCT being uniquely dependent on the molecular size/shape of A+ and D, as well as the dimensions of the zeolite cavities.In accordance with the bond compression model of intermolecular charge-transfer complexes, the bathochromic shifts to lower energies (+ΔhνCT) are ascribed to hyperbaric effects induced by the absorption of water within the constricted channels of zeolite-L, mordenite, and mazzite (but not in the larger supercage of zeolite-Y).The importance of water coordination is also underscored by the unusual hypsochromic effects (-ΔhνCT) that are observed when cyano-substituted pyridinium acceptors o-CP+ and p-CP+ are doped into zeolite-Y (but not into zeolite-L, mordenite, or mazzite).These results thus show that the intermolecular charge-transfer complexes +, D> are shape-selective and can be used as quantitative visual probes for water absorption into zeolite cavities, and they provide the experimental basis for further theoretical analysis.
Empirical Analysis on the Constituent Terms of Transfer Enthalpies. Quarternary Ammonium Ions in Acetonitrile-Methanol Mixtures.
Kondo, Yasuhiko,Uematsu, Ryoichi,Nakamura, Yoshinobu,Kusabayashi, Shigekazu
, p. 111 - 116 (2007/10/02)
Through an empirical analysis of transfer enthalpies in acetonitrile-methanol mixtures using ten quaternary ammonium ions, an equation which expresses the behaviour of the transfer enthalpy as a function of solvent composition has been derived: .On the basis of this equation it is suggested that the transfer enthalpy includes at least three types of interaction, a protophobic interaction, an electrostatic interaction and another interaction, presumably a specific interaction such as dipole-dipole or acid-base association.
