铈（III）和镨（III）与2,6-吡啶二甲酸形成的三维金属有机骨架结构中存在水二聚体和六聚体簇。

Coexistence of water dimer and hexamer clusters in 3D metal-organic framework structures of Ce(III) and Pr(III) with pyridine-2,6-dicarboxylic acid.

作者信息

Ghosh Sujit K, Bharadwaj Parimal K

机构信息

Chemistry Department, Indian Institute of Technology Kanpur, 208016, India.

出版信息

Inorg Chem. 2003 Dec 15;42(25):8250-4. doi: 10.1021/ic034976z.

DOI:10.1021/ic034976z

PMID:14658875

Abstract

Ce(NO3)3.6H2O or Pr(NO3)3.6H2O and pyridine-2,6-dicarboxylic acid form a linear coordination polymeric structure under hydrothermal conditions. Hexameric water clusters join these linear chains through bonding to the metal ions. Other coordinated water and the carboxylate oxygen form an intricate array of hydrogen bonding resulting in a 3D network where each metal ion shows 9-coordination with an approximate D3 symmetry. Dimeric water clusters are also located in the void spaces. In the structure containing Pr(III), the water dimers are hydrogen-bonded to the hexamers, whereas in the Ce(III) structure, the dimers and the hexamers are far apart.

摘要

硝酸铈（III）六水合物或硝酸镨（III）六水合物与2,6 - 吡啶二甲酸在水热条件下形成线性配位聚合物结构。六聚体水簇通过与金属离子键合连接这些线性链。其他配位水和羧酸根氧形成复杂的氢键阵列，从而形成三维网络，其中每个金属离子呈现出近似D3对称性的九配位。二聚体水簇也位于空隙空间中。在含有Pr（III）的结构中，水二聚体与六聚体形成氢键，而在Ce（III）结构中，二聚体和六聚体相距较远。