Issue 19, 2011

Structural and magnetic properties of three novel complexes with the versatile ligand 5-methyl-1,2,4-triazolo[1,5-a]pyrimidin-7(4H)-one

Abstract

Conventional reactions of the versatile multidentate ligand 5-methyl-1,2,4-triazolo[1,5-a]pyrimidin-7(4H)-one (HmtpO) with metallic(II) salts lead to three novel multidimensional complexes [Cu(HmtpO)2(H2O)3](ClO4)2·H2O (1), {[Cu(HmtpO)2(H2O)2](ClO4)2·2HmtpO}n (2) and {[Co(HmtpO)(H2O)3](ClO4)2·2H2O}n (3). In each compound, the triazolopyrimidine ligand shows a different and unusual coordination mode, giving rise to structures with diverse topologies and dimensionality. Compound 1 is a monomeric complex, in which HmtpO shows both N3-monodentate and N1,O71-bidentate modes. 2 is a bidimensional framework with the ligand showing a N3,O71 bidentate-bridging mode. The structure of 3 consists of 1D chains, in which HmtpO displays a N1,N3,O71-tridentate-bridging mode. It should be noted that these coordination modes of the HmtpO ligand are unique in the case of compounds 2 and 3. On the other hand, the magnetic properties of the polynuclear complexes 2 and 3 have been studied showing weak ferromagnetic and antiferromagnetic behaviour, respectively.

Graphical abstract: Structural and magnetic properties of three novel complexes with the versatile ligand 5-methyl-1,2,4-triazolo[1,5-a]pyrimidin-7(4H)-one

Supplementary files

Article information

Article type
Paper
Submitted
19 Oct 2010
Accepted
11 Feb 2011
First published
11 Apr 2011

Dalton Trans., 2011,40, 5180-5187

Structural and magnetic properties of three novel complexes with the versatile ligand 5-methyl-1,2,4-triazolo[1,5-a]pyrimidin-7(4H)-one

A. B. Caballero, A. Rodríguez-Diéguez, L. Lezama, E. Barea and J. M. Salas, Dalton Trans., 2011, 40, 5180 DOI: 10.1039/C0DT01416H

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