Polymeric chain complexes of copper(II) chloride with 1,5-disubstituted tetrazoles: Structure and magnetic properties

Abstract

The complex [Cu(5-(N,N-dimethylaminomethyl)-1-(pyridin-2-yl)tetrazole)Cl2]n (1) was prepared by the reaction of 5-(N,N-dimethylaminomethyl)-1-(pyridin-2-yl)tetrazole with copper(II) chloride in solution. According to the single crystal X-ray analysis, complex 1 presents a 1D coordination polymer, formed at the expense of single chlorido bridges between neighboring pentacoordinated copper(II) cations. The tetrazole acts as a chelating ligand, coordinated via the heteroring N4 atoms and the nitrogen atom of the amino group. The temperature-dependent magnetic susceptibility measurements of complex 1, as well as previously described chain coordination polymers [Cu(1-methyl-5-vinyltetrazole)Cl2]n (2) and [Cu2(1-methyl-5-methylsulfonyltetrazole)2(H2O)2Cl4]n (3), revealed that the copper(II) ions are antiferromagnetically coupled in all the complexes. A superexchange pathway between the metal cations in complex 2 is provided at the expense of double chlorido bridges and the tetrazole ring N3,N4-bridges. In complex 3, this pathway is provided by double chlorido bridges which link alternating Cu(1-methyl-5-methylsulfonyltetrazole)2 and Cu(H2O)2 fragments.