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- W2023746095 abstract "The structure of 2,5-dicarboxy-1-methylpyridinium inner salt (1), has been studied by X-ray diffraction, B3LYP/6-311G(d,p) calculations, FTIR, Raman and NMR spectroscopy. The molecules are linked by short intermolecular and asymmetric O-H⋯O hydrogen bonds of 2.486(2)Å between carboxyl and carboxylate groups of neighboring molecules into infinite chains. The hydrogen bonds in the molecules optimized by the B3LYP/6-311G(d,p) approach in trimer (2) and dimer (3) are slightly longer than in the crystal. The FTIR spectrum of the investigated inner salt is dominated by a broad and intense absorption in the 1500-800 cm(-1) region attributed to the ν(as)(OHO) and γ(OHO) vibrations of the strong hydrogen bond. In the Raman spectrum the broad absorption is absent. Linear correlations, δ(exp)=a+b σ(calc) between the experimental (1)H and (13)C NMR chemical shifts (δ(exp)) of the investigated inner salt in D2O and the calculated magnetic isotropic shielding constants (σ(calc)) for the optimized monomer (4a) solvated in water are reported. The pKa value for 1 of 2.31±0.02 was determined by the potentiometric titration." @default.
- W2023746095 created "2016-06-24" @default.
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- W2023746095 date "2014-03-01" @default.
- W2023746095 modified "2023-10-18" @default.
- W2023746095 title "Spectroscopic and structural investigation of 2,5-dicarboxy-1-methylpyridinium inner salt" @default.
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- W2023746095 doi "https://doi.org/10.1016/j.saa.2013.10.123" @default.
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