Assembly of Three Cadmium(II) Complexes Based on Flexible α,ѡ-Bis(benzimidazolyl)alkane Ligands

Three flexible α,ѡ-bis(5,6-dimethylbenzimidazolyl)alkane ligands with different spacers were reacted with CdX₂ (X = Cl, Br, I) hydrothermally, resulting in three coordination architectures, namely [CdI₂(L¹)]_n (1), [CdBr₂(L²)]_n (2), and Cd₂Cl₄(L³)₂ (3) [L¹ = 1,3-bis(5,6- dimethylbenzimidazole)propane, L² = 1,5-bis(5,6-dimethylbenzimidazole)pentane, L³ = 1,6- bis(5,6-dimethylbenzimidazole)hexane]. They have been characterized by elemental analyses, IR spectra, thermogravimetric (TG) analysis, and single-crystal X-ray diffraction. Complex 1displays a helical chain linked by the ligands L¹, and a 2D supramolecular network is constructed through π-π stacking interactions; complex 2shows a helical chain structure with connections through two kinds of strong π-π stacking interactions into an intricate 3D supramolecular network; complex 3 contains dinuclear metallomacrocycles. The fluorescence properties of 1-3have been investigated in the solid state

Graphical Abstract

Assembly of Three Cadmium(II) Complexes Based on Flexible α,ѡ-Bis(benzimidazolyl)alkane Ligands