The relevance of the fluorine interactions in the supramolecular structure of a complex constructed from copper(II) hexafluoroacetylacetonate and the 4'-(3-pyridyl)-2,2':6',2'-terpyridine ligand. Novel C-F/π synthons involving the π-system of the terpyridine moieties and those of the hexafluoroacetylacetonate chelate rings

摘要

Reaction of 4'-(3-pyridyl)-2,2':6',2"-terpyridine (pyterpy) with Cu(hfacac)2 (hfacac = hexafluoroacetylacetonate) led to the formation of the novel compound [Cu3(hfacac)4(μ-pyterpy)2][Cu(hfacac)3]2 (1). The structure is composed of a trinudear [Cu3(hfacac)4(μ-pyterpy)2]~(2+) cation and two [Cu(hfacac)3]~-anionic species. The cation consists of a chain of three Cu~(II) atoms connected by bridging pyterpy ligands. The [Cu(hfacac)3]~- anions have the hfacac ligands coordinated in their usual chelating manner through their carbonyl O donors. Besides the coulombian forces, the ionic species are fixed by C-H···O, C-H···F, F···F and a variety of unusual inter-ion C-F···π interactions that control the packing motif. These π-interactions involve the terpyridine groups from the pyterpy ligand and the five-membered rings of the chelating hexafluoroacetylacetonate anions.