Synthesis, structure and properties of hexacoordinated compounds of cadmium(II) halides/pseudohalides containing a pentadentate N-donor Schiff base

Abstract

Five hexacoordinated compounds of type [Cd(L)(X)]Y· nMeCN ( 1– 5) [L = N,N′-(bis(pyridin-2-yl)benzylidene)diethylenetriamine; Y = PF 6 - , n = 1; X = Cl − ( 1), Br − ( 2), I − ( 3) and Y = PF 6 - , n = 0, X = N 3 - , ( 4); Y = ClO 4 - , n = 0, X = NCO −, ( 5)] are synthesized and characterized. Structures of all the compounds are solved by X-ray diffraction measurements. Structural analyses reveal that each cadmium(II) center adopts a distorted octahedral geometry bound by five N atoms of L along with terminal halide in 1– 3 and N atom of terminal pseudohalide in 4 and 5. Intermolecular N H⋯O, C H⋯O, N H⋯F and C H⋯F hydrogen bondings and C H⋯π interactions as is the case lead to different crystalline aggregates in 1– 5. The complexes display intraligand 1(π π *) fluorescence in DMF solutions at room temperature.