Magnetic interactions in dicopper(II) complexes of a new endogenous alkoxo bridging ligand with exogenous pyrazolate, azide and acetate bridges. X-ray structure of [Cu2L(μ-C3H3N2)(OClO3)(H2O)](ClO4)·H2O (HL=1,3-bis[N-methyl-N-(2-pyridylethyl)amino]propan-2-ol)

Gupta, Rajeev ; Hotchandani, Rajeev ; Mukherjee, Rabindra Nath (2000) Magnetic interactions in dicopper(II) complexes of a new endogenous alkoxo bridging ligand with exogenous pyrazolate, azide and acetate bridges. X-ray structure of [Cu2L(μ-C3H3N2)(OClO3)(H2O)](ClO4)·H2O (HL=1,3-bis[N-methyl-N-(2-pyridylethyl)amino]propan-2-ol) Polyhedron, 19 (12). pp. 1429-1435. ISSN 0277-5387

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Official URL: http://dx.doi.org/10.1016/S0277-5387(00)00391-0

Related URL: http://dx.doi.org/10.1016/S0277-5387(00)00391-0

Abstract

Using a new dinucleating ligand, 1,3-bis[N-methyl-N-(2-pyridylethyl)amino]propan-2-ol (HL), in its deprotonated form, three new binuclear copper(II) complexes [Cu2(L)(μ-X)(ClO4)(H2O)](ClO4)·H2O (X=C3H3N2- (prz), N3- and MeCO2-) have been synthesized. The crystal structure of pyrazolate (prz) compound was determined and revealed that the complex contains an endogenous bridging alkoxide ligand and an exogenous bridging prz ligand. A water molecule is coordinated to a copper(II) center and is hydrogen-bonded to the alkoxide O atom. A perchlorate ion is 'semi-coordinated' to another copper(II) center as a monodentate ligand and is hydrogen-bonded to a second water molecule. The coordination geometry around both copper centers resembles a distorted square pyramid. The magnetochemical characteristics of these compounds were determined by temperature-dependent magnetic studies, revealing their antiferromagnetic behavior [-2J (in cm-1) values: 550±25 for prz, 360±10 for azide and 100±10 for acetate]. The ground state magnetic orbital involved in spin coupling is similar (dx2-y2) in these complexes. Differences in the magnetic behavior have been rationalized in terms of the bridging ligand orbital complementary/countercomplementary concept. Spectroscopic properties of these complexes are also reported.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Dinucleating Alkoxide Ligands; Copper(II) Complexes; X-ray Structures; Hetero-bridged Complexes; Magnetism; Magneto-structural Trends
ID Code:26021
Deposited On:04 Dec 2010 10:33
Last Modified:03 Mar 2011 07:45

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