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Structural and magnetic characterization of 1-D complexes constructed from pyrazole-3,5-dicarboxylate bridging multi copper(II) centers |
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| Authors: | Salah S Massoud Febee R Louka Masahiro Mikuriya Franz A Mautner |
| Institution: | a Department of Chemistry, University of Louisiana at Lafayette, P.O. Box 44370, Lafayette, LA 70504-4370, USA b School of Sciences and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda 669-1337, Japan c Institut für Chemische Technologie von Materialien, Technische Universität Graz, Stremayrgasse 16, A-8010 Graz, Austria d Institut für Physikalische and Theoretische Chemie, Technische Universität Graz, A-8010 Graz, Austria |
| Abstract: | In aqueous solution, the reaction of Cu(ClO4)2 and di(2-pyridylmethyl)amine, DPA with the disodium salt of pyrazole-3,5-dicarboxylate (Na2Hpzdc) in presence of sodium azide afforded the azido complex Cu3(DPA)3(μ-pzdc)(μ-N3)](ClO4)2·2H2O (1) whereas when reaction was conducted in absence of sodium azide the perchlorato complex Cu3(DPA)3(μ-pzdc)(μ-ClO4)](ClO4)2·3H2O (2) was obtained. The complexes were structurally characterized by physicochemical techniques and by single crystal X-ray crystallography in case of 1. The coordination sphere of the two complexes which are iso-structural polymeric 1D systems consist of three independent Cu(DPA) units, one pzdc bridging ligand and one end-on bridging azido group in 1 or one bridging perchlorato group in 2. The three Cu(II) centers in both complexes may be described as axially elongated octahedral. Magnetic susceptibility measurements reveal the weak anti-ferromagnetic coupling in the two complexes (J = −23.2 cm−1 for 1 and −14.8 cm−1 for 2). |
| Keywords: | Copper Polynuclear complexes Pyrazole dicarboxylate Crystal structure Magnetic properties |
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