Hydrothermal synthesis, structural characterisation and magnetic behaviour of hybrid complexes of N-(phosphonomethyl)iminodiacetate

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• 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–HO hydrogen bonds leading to the formation of anionic andle=V-WA-A-W-WW-MsSWYVW-UUA-U-AABZBCZYZC-AABBEBDZZC-CAYCDBZVZ-WW-U&_acct=C000050221&_version=1&_userid=10&md5=64478dc8443d9eb4e10a204a72fba51e"> layers. One-dimensional cationic andle=V-WA-A-W-WW-MsSWYVW-UUA-U-AABZBCZYZC-AABBEBDZZC-CAYCDBZVZ-WW-U&_acct=C000050221&_version=1&_userid=10&md5=3d0b1b51acd40c54fb188bad70fa55e0"> coordination polymers are placed in-between and strongly hydrogen-bonded to these layers. The magnetic properties of these two materials are also reported.