Metallamacrocyclic complexes of Ni(ii) with 3,3,3′,3′-tetraalkyl-1,1′-aroylbis(thioureas): crystal and molecular structures of a 2 : 2 metallamacrocycle and a pyridine adduct of the analogous 3 : 3 complex
Abstract
The crystal and molecular structure of a square planar 2 : 2 metallamacrocyclic Ni(II) complex of 3,3,3′,3′-tetraethyl-1,1′-isophthaloylbis(thiourea) is reported together with that of the octahedral Ni(II) pyridine adduct of the corresponding 3 : 3 metallamacrocycle synthesised from 3,3,3′,3′-tetraethyl-1,1′-terephthaloylbis(thiourea). The former complex is a nearly planar molecule which packs in a manner dictated by strong π–π interactions. The latter is found to possess an unusually large unit cell containing two adduct molecules, with significantly dissimilar conformations, and five