Synthesis, characterization, NLO study, and antimicrobial activities of metal complexes derived from 3-(3-(2-hydroxyphenyl)-3-oxoprop-1-enyl)-4H-chromen-4-one and sulfanilamide

Abstract

A series of metal(II) complexes ML (where M = Cu(II), Co(II), Ni(II), Zn(II), Mn(II), Cd(II), and VO(II)) have been prepared from 3-(3-(2-hydroxyphenyl)-3-oxoprop-1-enyl)-4H-chromen-4-one and sulfanilamide. The structures of the complexes have been investigated by elemental analysis, magnetic susceptibility, molar conductance, IR, UV-Vis, NMR, mass, and ESR spectral studies. Conductivity measurements reveal that the complexes are non-electrolytes, except the oxovanadium complex. Spectral and other data show square pyramidal geometry for oxovanadium and octahedral for the other complexes. The redox behaviors of the copper and vanadyl complexes have been studied through cyclic voltammetry. Antimicrobial activities of the compounds against several microorganisms indicate that some complexes have higher activity than free ligand. The compounds may serve as photoactive materials as indicated from their characteristic fluorescence properties. The second harmonic generation efficiency of the ligand was found to be higher than that of urea and KDP.

Keywords:

• 3-(2-Hydroxyphenyl)-3-oxoprop-1-enyl-4H-chromen-4-one
• Sulfanilamide
• Metal complexes
• Schiff base
• Fluorescence
• SHG

Acknowledgments

The authors thank the Management of Thiagarajar College, Madurai, and one of the authors (PT) thanks the Defence Research and Development Organization (DRDO), New Delhi for financial support and SAIF, IIT, Bombay and SAIF, CDRI, Lucknow for providing analytical techniques.