Raman spectroscopic analysis of the interaction between squaric acid and dimethylsulfoxide

被引：14

作者：

Georgopoulos, Stefanos L. ^{[1
]}

Edwards, Howell G. M. ^{[2
]}

de Oliveira, Luiz Fernando C. ^{[1
]}

机构：

[1] Univ Fed Juiz de Fora, Dept Quim, Nucleo Espect & Estrutura Mol, BR-36036900 Juiz De Fora, MG, Brazil

[2] Univ Bradford, Sch Life Sci, Div Chem & Forens Sci, Bradford BD7 1DP, W Yorkshire, England

来源：

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 2013年 / 111卷

关键词：

Squaric acid; DMSO; Raman spectroscopy; Theory of ionic dissociation; pKs; Complex formation; INDUCED FREQUENCY-SHIFTS; DIMETHYL-SULFOXIDE; VIBRATIONAL-SPECTRA; CRYSTAL-STRUCTURE; INFRARED-SPECTRUM; HYDROGEN SQUARATE; ORGANIC-SOLVENTS; FORCE CONSTANTS; PHOSPHORIC-ACID; ACETONITRILE;

D O I：

10.1016/j.saa.2013.03.052

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

The investigation of solutions of squaric acid in dimethylsulfoxide (DMSO) by Raman spectroscopy has facilitated the observation of the presence of different species derived from squaric acid such as the squarate dianion in solutions of 0.3 M and 0.5 M concentration and the hydrogen-squarate ion in solution concentrations greater than 2.0 M. The method described by Alia and coworkers was used to calculate the two pK values corresponding to the ions produced by squaric acid interacting with DMSO: the hydrogen squarate (pK(1) = 0.80) ion and the squarate dianion (pK(2) = 0.84). From the spectroscopic data it has been also possible to determine the complex formation between associated squaric acid/DMSO in the proportion squaric acid 1:1 DMSO in which the associated squaric acid is hydrogen-bonded to the S atom in the DMSO structure. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：54 / 61

页数：8

共 45 条

[1] FT-Raman spectroscopic study of ionic association and solvation in acrylonitrile solutions of calcium and magnesium perchlorate [J].