化学
同音
结晶学
位阻效应
金属
氢键
晶体结构
配体(生物化学)
硝基
分子
立体化学
有机化学
生物化学
受体
烷基
作者
Elisa Barea,M. Angustias Romero,Jorge A. R. Navarro,Juan M. Salas,Norberto Masciocchi,Simona Galli,Angelo Sironi
出处
期刊:Inorganic Chemistry
[American Chemical Society]
日期:2005-02-03
卷期号:44 (5): 1472-1481
被引量:14
摘要
In searching for coordination polymers containing the highly polarized 5-nitro-pyrimidin-2-olate ligand (NP), a number of species containing 3d transition metals have been prepared and characterized, namely Co(NP)2(H2O)4, [Co(NP)2]n, Ni(NP)2(H2O)4, [Ni(NP)2]x, and [Zn(NP)2]n. Their structures have been determined by X-ray powder diffraction methods. The hydrated compounds contain mononuclear M(NP)2(H2O)4 units interconnected by means of a three-dimensional (3D) network of hydrogen bonds. The homoleptic species, at variance from the already known metal(II) pyrimidin-2-olate ones, crystallize as two-dimensional (2D) slabs, where the metal coordination is of the MN3O kind. The electron-withdrawing nitro group, never bound to the metal ion, is likely to influence the observed stereochemistry through steric and dipolar effects within the crystal lattice. The thermal, spectroscopic, and magnetic properties of these species are presented. The M(NP)2(H2O)4/[M(NP)2]x,n systems interconvert reversibly upon dehydration/rehydration processes.
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