Hassanzadeh A, Zeini-Isfahani A, Habibi M H, Heravi M R A Poor, Abdollahi-Alibeik M
Department of Chemistry, University of Isfahan, Hezar Jerib Street, Isfahan 81745-73441, Iran.
Spectrochim Acta A Mol Biomol Spectrosc. 2006 Feb;63(2):247-54. doi: 10.1016/j.saa.2005.03.035. Epub 2006 Jan 6.
Azo-hydrazone tautomeric behavior of polyazo Solophenyl red 3BL (C.I. Direct 80) dye in different solvents (water, methanol and DMSO) was investigated using 1H, 13C, NH, HH, CH COSY, HH NOESY NMR techniques and UV-vis spectroscopy. Two-dimensional NMR experiments were used to assign 1H, 13C and 15N NMR lines unambiguously. Results showed that the hydrazone-form proton NMR signal appeared in the weakest field with respect to tetramethylsilane, in comparison with the amide and phenolic proton NMR signals. UV-vis absorption spectroscopic evidences showed that azo-hydrazone mixture exists in water and DMSO solvents, but in methanol, only azo tautomer was dominant, which was in a good agreement with NMR spectroscopic results.
使用1H、13C、NH、HH、CH COSY、HH NOESY核磁共振技术和紫外可见光谱，研究了聚偶氮索罗芬红3BL（C.I.直接染料80）染料在不同溶剂（水、甲醇和二甲基亚砜）中的偶氮-腙互变异构行为。二维核磁共振实验用于明确归属1H、13C和15N核磁共振谱线。结果表明，与酰胺和酚质子核磁共振信号相比，腙形式的质子核磁共振信号相对于四甲基硅烷出现在最弱的场中。紫外可见吸收光谱证据表明，偶氮-腙混合物存在于水和二甲基亚砜溶剂中，但在甲醇中，只有偶氮互变异构体占主导，这与核磁共振光谱结果高度一致。
