Abstract

The visible electronic absorption band of two 4�-phenyl-1,2,4-triazol-1-ium phenacylids was studied in two binary solvents: water (1) + ethanol (2) and water (1) + methanol (2) with variable content in water. The nature and the contribution of the intermolecular interactions to the spectral shifts in ternary solutions of the studied ylids were estimated based on the Kamlet Taft parameters (�*, a and a) previously measured by Buhvestov and all. The influence of the universal and specific interactions on the visible electronic band of the studied ylids depends on the water concentration in binary solvent. At small water concentrations in binary solvent, the hydrogen complexes of the type ylid-alcohol are predominant, while at high water concentrations, the complexes made by hydrogen bonds between water and ylid molecules prevail. The difference between the energies corresponding to molecular pairs of the types: ylid-water and ylid-alcohol was estimated based on the statistic cell model of the ternary solutions.

Highlights

  • Triazol-1-ium ylids are dipolar and polarizable molecules with opposite charges separated on the positive nitrogen belonging to the triazolium ring and on a negatively charged carbon, named carbanion and covalently bonded to two substituents [1,2,3]

  • Two carbanion mono-substituted 1,2,4-triazol-1-ium phenacylids, namely 4’-phenyl-1,2,4-triazol-1ium phenacylid (PTPY) and 4’-phenyl-1,2,4-triazol-1-ium-4’’-nitro-phenacylid (PTNPY) were studied in the two binary solvents obtained by mixing in molar fractions water with ethanol, respectively with methanol

  • Using the binary solvent Kamlet Taft parameters determined by Buhvestov and all. [17] for water

Read more

Summary

Introduction

Triazol-1-ium ylids are dipolar and polarizable molecules with opposite charges separated on the positive nitrogen belonging to the triazolium ring and on a negatively charged carbon, named carbanion and covalently bonded to two substituents [1,2,3]. Pharmacological activity, clinical implications, efficiency and costs of triazolium agents are reflected briefly in the review published by Flori [5] and their biological applications are underlined in a multitude of publications [6,7,8,9,10]. Some triazolium derivatives were tested [11] against a panel of positive and negative Gram bacteria and Candida albicans, showing good or moderate activities. Many 1,2,4 triazolium derivatives exhibit antimicrobial [11], antifungal [5] antitumor [12] anti-inflammatory [11], analgesic [6], diuretic [9] properties and so on

Methods
Results
Conclusion
Full Text
Paper version not known

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call