Novel eight-coordinated Cd(II) complexes with two homologous pyridine alcohols. Crystal structure, spectroscopic and thermal properties
- 作者：Agnieszka Jabł ; oń ; ska-Wawrzyckaa ; agajw@yahoo.com ; Katarzyna Stadnickab ; Joanna Masternaka ; Mał ; gorzata Zienkiewicza
- 关键词：Cadmium(II) complexes ; 2-Hydroxymethylpyridine ; 2-Hydroxyethylpyridine ; X-ray data ; Spectroscopic and thermal properties
- 刊名：Journal of Molecular Structure
- 出版年：2012
- 期刊代码：62_00222860
- 类别：ch
- 出版时间：28 March, 2012
- 卷：1012
- 期：Complete
- 页码：97-104
- 文件大小：1733 K
摘要
Two novel cadmium(II) complexes with homologous pyridine alcohols: [Cd(2-MeOHPy)2(NO3)2] (1) and [Cd(2-EtOHPy)2(NO3)2] (2) have been prepared and characterized by elemental analysis, X-ray crystallographic studies, spectroscopic (IR, 1H and 13C NMR) and thermal properties. IR, NMR and X-ray analysis have confirmed a bidentate fashion of coordination of heteroaromatic alcohols with Cd(II) ions. 2-MeOHPy bound directly to the central ion by N, O-donor atoms giving five-membered chelate ring but 2-EtOHPy formed less stable six-membered chelate ring. In the complex (1) and (2) bidentate nitrate ligands are arranged in cis position for organic ligands. In both cases cadmium(II) ions are eight-coordinated and shape of coordination polyhedral can be described as pseudo-dodecahedron (CdN2O6 chromophore type). The crystal packing of Cd(II) complexes are stabilized by intermolecular classical hydrogen bonds of OH鈰疧 and non-classical CH鈰疧 type. In addition, there are 蟺-蟺 stacking interactions between almost parallel-displaced pyridine rings of 2-hydroxymethylpyridine in the two neighbouring complex (1) molecules but the hydrogen interactions in (2) are formed by CH donor group of Py rings and 蟺-electron system of neighbouring one.