Hydrothermal synthesis, structural characterisation and magnetic behaviour of hybrid complexes of N-(phosphonomethyl)iminodiacetate
- 作者：Fa-Nian Shi ; Filipe A. Almeida Paz ; Penka I. Girginova ; Luí ; s Mafra ; Ví ; tor S. Amaral ; Joã ; o Rocha ; Anna Makal ; Krzysztof Wozniak ; Jacek Klinowski and Tito Trindade
- 关键词：Cobalt complexes ; Nickel complexes ; Coordination polymer ; N-(phosphonomethyl)-iminodiacetate ; Magnetic properties
- 刊名：Journal of Molecular Structure
- 出版年：2005
- 期刊代码：62_00222860
- 类别：ch
- 出版时间：2005
- 卷：754
- 期：1-3
- 页码：51-60
- 文件大小：537 K
摘要
Two new compounds containing multidentate chelating organic residues of N-(phophonomethyl)iminodiacetic acid (H4pmida), [M(pyr)(H2O)4][M2(Hpmida)2(pyr)(H2O)2]·2(H2O) (where pyr=pyrazine and M=Co2+ or Ni2+ for I and II, respectively) have been synthesised and structurally characterised by single-crystal and powder X-ray diffraction, elemental analysis, infrared spectroscopy, thermal analysis and solid-state 31P MAS NMR. The compounds contain discrete binuclear anionic [M2(Hpmida)2(pyr)(H2O)2]2− units in which one pyrazine ligand bridges two M2+ cations which are completely trapped inside three five-membered chelate rings formed by the Hpmida3− ligands. These moieties close pack in the ac plane via a series of strong and highly directional O–H
O hydrogen bonds leading to the formation of anionic 
layers. One-dimensional cationic 
coordination polymers are placed in-between and strongly hydrogen-bonded to these layers. The magnetic properties of these two materials are also reported.
O hydrogen bonds leading to the formation of anionic