Bis(pyrazol‐1‐yl)(pyridin‐x‐yl)methane Ligands – Mono‐ or Ditopic Ligands in Complexes and Supramolecular Frameworks. Issue 15 (1st February 2016)

• Record Type: Journal Article
• Authors: Manzano, Blanca R.; Jalón, Félix A.; Carrión, M. Carmen; Durá, Gema
• Other Names: Pettinari C. guestEditor.
• Is Part Of: European journal of inorganic chemistry. Issue 15/16(2016)
• Page Start: 2272
• Page End: 2295
• Publication Date: 2016-02-01
• Subjects: Supramolecular chemistry -- Noncovalent interactions -- Heteroscorpionates -- N ligands -- Nitrogen heterocycles; Chemistry, Inorganic -- Periodicals; Organometallic chemistry -- Periodicals; Bioinorganic chemistry -- Periodicals; Solid state chemistry -- Periodicals; 546
• DOI: 10.1002/ejic.201501271
• Languages: English
• ISSNs: 1434-1948

Abstract

Abstract : 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. Abstract : Bis(pyrazol‐1‐yl)(pyridin‐ x ‐yl)methane ligands give rise to a rich variety of complexes and supramolecular frameworks with a wide range of transition metals. With x = 2, the ligands behave as monotopic, usually with tripodal coordination, whereas with x = 3 or 4 they act as bridges, giving rise to polymers or dinuclear or trinuclear discrete species.