New Coordination Polymers of Lanthanide(III) with Tetrazole-1-acetic Acid: Synthesis, Crystal Structures, and Magnetic Properties

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Contents Vol 61(4)

doi:10.1071/CH07439

New Coordination Polymers of Lanthanide(iii) with Tetrazole-1-acetic Acid: Synthesis, Crystal Structures, and Magnetic Properties

Xiu-Qing Zhang ^A ^B, Qing Yu ^A, He-Dong Bian ^A, Shi-Ping Yan ^B, Dai-Zheng Liao ^B, Wen Gu ^B, Hong Liang ^A ^B ^C

^A College of Chemistry and Chemical Engineering, Guangxi Normal University, Guilin, Guangxi, 541004, P. R. China.
^B College of Chemistry, Nankai University, Tianjin, 300071, P. R. China.
^C Corresponding author. Email: gxnuchem312@yahoo.com.cn





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Australian Journal of Chemistry 61(4) 303–309 http://dx.doi.org/10.1071/CH07439
Submitted: 20 December 2007 Accepted: 15 March 2008 Published online: 24 April 2008

Abstract

New coordination polymers {[Ln(tza)₃(H₂O)₂]·mH₂O}_n (Ln = La^III 1 and Pr^III 2, m = 2; Ln = Nd^III 3, m = 1.5) and {[Sm₂(tza)₆(H₂O)₅]·H₂O}_n 4 (Htza = tetrazole-1-acetic acid) have been synthesized and characterized by IR spectroscopy, elemental analysis, X-ray crystallography, and magnetic measurements. The Htza ligand coordinates to the lanthanide cations through the carboxylate group in a monodentate, bridging bidentate coordination mode or bridging tridentate to two metal centres. Complexes 1 and 2 are isostructural. Complex 3 has a similar structure to 1 and 2, but the arrangement of ligands has changed. Complex 4 consists of two types of metallic molecules. Magnetic measurements show weak antiferromagnetic coupling between the metal centres in complexes 2 and 3.