Abstract
The title compound is a new pyrazolone derivative which was synthesized starting from p-sulphophenyl-3-methyl-5-pyrazolone (1) by nitrosation at low temperature to afford the corresponding p-sulphophenyl-3-methyl-4-nitroso-5-pyrazolone which can exist both in nitroso (2a) and oxime tautomeric forms (2b). Reduction of the latter using zinc with hydrochloric acid furnished the 4-amino-p-sulphophenyl-3-methyl-5-pyrazolone (3). The diazotization of (3) under careful control of temperature and pH afforded the p-sulphophenyl-3-methyl-5-pyrazolone diazonium salt (4) which was re-crystallized from acidified ethanol to afford crystal suitable for X-ray studies. UV–visible spectrum and cyclic voltammetric studies were also carried out indicating λmax at 420 nm and HOMO-LUMMO energy gap was also calculated (Eg) of 2.95 eV. The molecular and crystal structures of the compound were clarified by single crystal X-ray diffraction indicated that it crystallizes as the sodium salt in the triclinic space group P -1, with the 4-azo-pyrazolone and the sulphophenyl groups being nearly coplanar. To get an insight to the intermolecular interactions in the crystal, a Hirshfeld surface analysis was also carried out.
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The authors are grateful to Quaid-I-Azam University, Islamabad, Pakistan for providing research funds.
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Ghulam Shabir: synthesis and interpretation, electrochemical studies. Ghulam Hussain: synthesis and data collection. Aamer Saeed: conceptualization, manuscript writing. Tasawwar Hussain: writing draft, optical studies. Tuncer Hökelek: Hirshfeld surface analysis. Mauricio F. Erben: optical studies. Ulrich Flörke: crystallography.
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Research highlights
1. Solid stable diazonium salt, synthetic precursor towards acid Azo dyes
2. Triclinic geometry with coplanar 4-azo-pyrazolone and the sulphophenyl groups
3. Absorption maximum (λmax) in visible range at 420 nm
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Shabir, G., Hussain, G., Saeed, A. et al. Investigation of stable solid diazonium salt by molecular structure, Hirshfeld surface analysis, optical and electrochemical studies, and applications. J Mol Model 27, 296 (2021). https://doi.org/10.1007/s00894-021-04910-1
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DOI: https://doi.org/10.1007/s00894-021-04910-1