Sarkar S, Dey K. A series of transition and non-transition metal complexes from a NâOâ hexadentate Schiff base ligand: Synthesis, spectroscopic characterization and efficient antimicrobial activities.
SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2010;
77:740-748. [PMID:
20801711 DOI:
10.1016/j.saa.2010.06.041]
[Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2010] [Revised: 06/19/2010] [Accepted: 06/28/2010] [Indexed: 05/29/2023]
Abstract
Some transition and non-transition metal complexes of the hexadentate NâOâ donor Schiff base ligand 1,8-N-bis(3-carboxy)disalicylidene-3,6-diazaoctane-1,8-diamine, abbreviated to Hâfsatrien, have been synthesized. All the 14 metal complexes have been fully characterized with the help of elemental analyses, molecular weights, molar conductance values, magnetic moments and spectroscopic (UV-Vis, IR, NMR, ESR) data. The analytical data helped to elucidate the structures of the metal complexes. The Schiff base, Hâfsatrien, is found to act as a dibasic hexadentate ligand using NâNâOâ donor set of atoms (leaving the COOH group uncoordinated) leading to an octahedral geometry for the complexes around all the metal ions except VOÂČ(+) and UOâÂČ(+). However, surprisingly the same ligand functions as a neutral hexadentate and neutral tetradentate one towards UOâÂČ(+) and VOÂČ(+), respectively. In case of divalent metal complexes they have the general formula [M(Hâfsatrien)] (where M stands for Cu, Co, Hg and Zn); for trivalent metal complexes it is [M(Hâfsatrien)]X·nHâO (where M stands for Cr, Mn, Fe, Co and X stands for CHâCOO, Cl, NOâ, ClOâ) and for the complexes of VOÂČ(+) and UOâÂČ(+), [M(Hâfsatrien)]Y (where M=VO and Y=SOâ); M=UOâ and Y=2 NOâ). The Schiff base ligand and most of the complexes have been screened in vitro to judge their antibacterial (Escherichia coli and Staphylococcus aureus) and antifungal (Aspergillus niger and Pencillium chrysogenum) activities.
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