Abstract
AbstractTwo complexes, a cobalt(II) complex [Co(phen)3(NO3)2]·2H2O (1) and a novel Co(III) complex with mixed ligands [diazido-bis(1,10-phenanthroline-κ2 N,N′)cobalt(III)]nitrate [Co(phen)2(N3)2]NO3 (2), have been synthesized and were characterized by physico-chemical and spectroscopic methods. The cobalt(III) complex (2) crystallizes in the orthorhombic crystal system with space group Iba2 with four formula units. The central Co(III) atom is six coordinate with four N atoms of two 1,10-phenanthroline (1,10-phen) molecules and two terminal N atoms from two azide anions giving a distorted octahedral geometry with a CoN6 chromophore. The molecular structure of the compound is consolidated by face-to-face π–π stacking between the aromatic rings of 1,10-phen ligand. The ligands, metal salt and the complexes were also evaluated for their antimicrobial activities in vitro against eight pathogens (four bacteria and four fungi species).
Highlights
The design and synthesis of new metal complexes based on transition metal ions and diimine ligands, such as 1,10-phenanthroline (1,10-phen) and 2,2′-bipyridine, is an interesting field for the development of new functional materials with intriguing structures and potential applications (Amani, Safari, Khavasi, & Mirzaei, 2007)
The Minimum inhibitory concentration (MIC) values indicate that the ligands (1,10-phen and azide) have higher activity against the bacteria species than the fungi, with 1,10-phen being more active than azide
The equatorial and terminal azide ligands coordinate in a non-linear manner to the central metal ion while two 1,10-phen ligands coordinate to the Co(III) ion through four N-atoms, two axial and two equatorial
Summary
The design and synthesis of new metal complexes based on transition metal ions and diimine ligands, such as 1,10-phenanthroline (1,10-phen) and 2,2′-bipyridine, is an interesting field for the development of new functional materials with intriguing structures and potential applications (Amani, Safari, Khavasi, & Mirzaei, 2007). Mixed ligand complexes with 1,10-phen is interesting due to their potential role as models for biological systems such as binding of small molecules to DNA (Jennifer & Muthiah, 2014; Yesilel, Olmez, Yılan, Pasaoglu, & Buyukgungor, 2006). The geometries of the complexes are greatly influenced by factors such as different coordination abilities of the ligands and the counterion. These nitrogen-containing heterocycles are metalcoordinating, electron-deficient aromatic systems which can undergo π–π stacking interactions as π-acceptors (Pook et al, 2015)
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