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Synthesis, Structural Characterization, EPR Analysis and Antimicrobial Activity of a Copper-1,5-dioxa-3,7-diazacyclooctane
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Synthesis, Structural Characterization, EPR Analysis and Antimicrobial Activity of a Copper-1,5-dioxa-3,7-diazacyclooctane
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Journal Article
Synthesis, Structural Characterization, EPR Analysis and Antimicrobial Activity of a Copper-1,5-dioxa-3,7-diazacyclooctane
2025
Overview
The reaction of bipyridine 3,7-di(3-pyridyl)-1,5-dioxa-3,7-diazacyclooctane (L) with copper thiocyanate produces a discrete metallamacrocycle [Cu(L)(SCN)[sub.2](DMF)][sub.2] (1). In complex 1, two cis-coordinated ligands combine with two copper ions to form an unabridged 24-membered macrocycle. Each copper ion is five-coordinated with two nitrogens from separate ligands, two nitrogens from thiocyanates and one oxygen from the dimethylformamide (DMF) solvent. Complex 1 has been characterized using single-crystal X-ray diffraction, optical and thermal analyses and antimicrobial activity measurements. The solid electron paramagnetic resonance (EPR) analysis of complex 1 yielded a characteristic structural g factor value of 2.147. In addition, the thermal analysis established that the complex is thermally stable at up to 176 °C. The antimicrobial activity measurements demonstrated that both the ligand and complex 1 exhibit an inhibitory effect on two strains, where the complex exhibits a significantly greater inhibition relative to that of the free ligand (p < 0.05).
Publisher
MDPI AG
Subject
