Bis(pyrazol-1-yl)(pyridin-x-yl)methane Ligands - Mono- or Ditopic Ligands in Complexes and Supramolecular Frameworks
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- 作者：Blanca R. Manzano ; Fé ; lix A. Jaló ; n ; M. Carmen Carrió ; n and Gema Durá
- 刊名：European Journal of Inorganic Chemistry
- 出版年：2016
- 出版时间：June 2016
- 年：2016
- 卷：2016
- 期：15-16
- 页码：2272-2295
- 全文大小：7656K
- ISSN：1099-0682c
文摘
Bis(pyrazol-1-yl)(pyridin-x-yl)methane ligands give rise to a rich variety of complexes with a wide range of transition metals. The derivatives with x = 2 act as monotopic and tripodal ligands. In the cases of ligands with x = 3 or 4, tripodal coordination is no longer possible and they generally behave as ditopic ligands that bridge two metal centres in cyclic dimers and trinuclear or polymeric species. The metal geometry has a clear influence on the type of compound formed. Ligands with x = 3 generate chiral cyclic dimers. Ligands that contain two bis(pyrazolyl)methane groups behave as ditopic, but they also act in a monotopic fashion in some cases. Analysis of the influence of some factors as the counteranion or the substituents on the ligand rings has been carried out. A two-step methodology starting from dimers and connectors was used to obtain egg-crate polymers or hexanuclear cyclic helicates. A comparative analysis of some parameters of the ligands has been performed.