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- Title
A method for increasing the solubility of industrial azo pigments for <sup>13</sup>C and ¹H NMR spectra and the assignments of their <sup>13</sup>C and ¹H NMR peaks.
- Authors
Meiling Zhu; Guangyuan Feng; Dongjun Lv; Nan Qin; Chunbao Li
- Abstract
A method for increasing the solubilities of industrial azo pigments in DMSO by adding DBU (1,8-diaza-7-bicyclo[5.4.0]undecene) has been developed. This facilitated the acquisition of solution 13C NMR spectra of the pigments. This method was applied to four types of azo pigments: naphthol AS (3-hydroxy-2-naphthoic acid anilide) pigments, naphthol pigments, pyrazolone pigments and acetoacetanilide pigments. This represents the first solution 13C NMR spectra for naphthol AS pigments. Altogether 18 industrial azo pigments were analysed using 1D and 2D NMR techniques. The proton and corresponding carbon NMR resonances of these pigments have all been assigned.
- Subjects
SOLUBILITY; NAPHTHOL; PYRAZOLONES; DIMETHYL sulfoxide; PROTONS
- Publication
Magnetic Resonance in Chemistry, 2021, Vol 59, Issue 8, p804
- ISSN
0749-1581
- Publication type
Article
- DOI
10.1002/mrc.5138