Hydrothermal synthesis, structural characterisation and magnetic behaviour of (4,4′-bpyH)2[M(4,4′-bpy)(H2O)4][V2O2(p
- 作者：Fa-Nian Shi ; Filipe A. Almeida Paz ; Penka I. Girginova ; Ví ; tor S. Amaral ; Joã ; o Rocha ; Jacek Klinowski and Tito Trindade
- 关键词：Cobalt complexes ; Manganese complexes ; Coordination polymer ; N-(phosphonomethyl)iminodiacetic acid ; Magnetic properties
- 刊名：Inorganica Chimica Acta
- 出版年：2006
- 期刊代码：40_00201693
- 类别：ch
- 出版时间：1 March 2006
- 卷：359
- 期：4
- 页码：1147-1158
- 文件大小：583 K
摘要
Two new structures containing N-(phosphonomethyl)iminodiacetate residues (pmida4−) and 4,4′-bipyridine, (4,4′-bpyH)2[M(4,4′- bpy)(H2O)4][V2O2(pmida)2] · 2H2O (where M = Mn2+ or Co2+), have been synthesised using hydrothermal methods and characterised structurally by single-crystal and powder X-ray diffraction, elemental analysis, infrared spectroscopy and thermal analysis. The magnetic behaviour of these two materials is also described. The compounds are formed by close packing (mediated by electrostatic interactions) of one-dimensional cationic polymers and 4,4′-bpyH+ cations, along with dimeric centrosymmetric [V2O2(pmida)2]4− anionic moieties. Hydrogen-bonded sub-network formed by highly directional and very strong homonuclear O–HO and heteronuclear N+–HO interactions interconnects these moieties into a three-dimensional framework. Systematic surveys of the Cambridge Structural Database were performed to collect information on the distribution of bond distances (Mn–N, Mn–Owater, Co–N, Co–Owater, V–N, V–Ocarboxylate and VO), and to characterise the local coordination environments of Mn2+, Co2+ and V4+.