titoli, abstracts, parole chiave >>>
A Novel μ1,1-azido-, μ2-alkoxo-, and μ2-phenoxo-bridged tetranuclear copper(II) complex with a quinquedentate Schiff-base ligand: magneto-structural and DFT studies

Basak, Subhra and Sen, Soma and Rosair, Georgina and Desplanches, Cédric and Garribba, Eugenio and Mitra, Samiran (2009) A Novel μ1,1-azido-, μ2-alkoxo-, and μ2-phenoxo-bridged tetranuclear copper(II) complex with a quinquedentate Schiff-base ligand: magneto-structural and DFT studies. Australian Journal of Chemistry, Vol. 62 (4), p. 366-375. eISSN 1445-0038. Article.

Full text not available from this repository.

DOI: 10.1071/CH08511

Abstract

A novel tetranuclear copper(II) complex [Cu4L21,1- N3)2]•CH3CN (1) has been synthesized using a symmetrical quinquedentate N2O3-donor Schiff-base ligand H3L (N,N′-(2-hydroxypropane-1,3-diyl)bis(2- hydroxyacetophenimine)) and characterized by elemental analysis, Fourier-transform (FT)-IR, UV-visible, electron paramagnetic resonance spectroscopy, and cyclic voltammetry. The X-ray single-crystal structure of 1 reveals three kinds of bridges among the four metal centres: one from the exogenous azido ligand and two from the phenoxo and alkoxo moieties of the Schiff base. The same structure highlights the remarkable versatility of copper(II) to adopt an array of stereochemistries. Four unusual eight-membered metallacycles exist in 1. The μ1,1-azido, μ2-alkoxo, and μ2-phenoxo bridges among the four copper centres have facilitated interesting magnetic interactions that have been elucidated by variable-temperature magnetic susceptibility measurements and backed up by density functional theory calculations. Detailed analyses have shown that the antiferromagnetic effect through the alkoxo-bridged CuII centres combined with the ferromagnetic interaction through the azido-bridged metal centres results in an S = 0 ground state.

Item Type:Article
ID Code:3733
Status:Published
Refereed:Yes
Uncontrolled Keywords:Tetranuclear copper(II) complex, quinquedentate Schiff-base ligand, ferromagnetic interaction
Subjects:Area 03 - Scienze chimiche > CHIM/03 Chimica generale e inorganica
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:CSIRO Publishing
eISSN:1445-0038
Deposited On:15 Apr 2010 12:31

I documenti depositati in UnissResearch sono protetti dalle leggi che regolano il diritto d'autore

Repository Staff Only: item control page