Organically templated chained chlorocadmates and cadmium-chloro thiocyanates

Abstract

With the protonated piperazine (pip) and triethylenediamine (1,4-diazabicyclo[2,2,2]octane, dabco) as the templates, two chained chlorocadmates [H2pip][Cd2Cl6(H2O)2] 1, [H2dabco][Cd2Cl6]·H2O 2 and two chained cadmium-chloro thiocyanates [H2pip][CdCl3(SCN)]·2H2O 3, [H2dabco]2[Cd3Cl8(SCN)2]·H2O 4 were obtained, and characterized by IR analysis, CHN analysis, TG analysis and X-ray single-crystal diffraction. The 1-D chain structure of compound 1 is the simplest, and can be described as a zigzag infinite extension of Cd octahedra via sharing the edges. Compound 2 shows a double-chain structure, comprising the dinuclear Cd2Cl9 subunits linked together via sharing the corners and the edges. Compounds 3 and 4 are the first examples of a family of organically templated chained cadmium-chloro thiocyanates. Compound 3 shows a linear-chain structure, comprising the Cd2Cl6 dimers by the SCN−groups, whereas compound 4 shows a stepped-chain structure, comprising the hexanuclear Cd6Cl16 subunits by the SCN−groups. Through intramolecular and intermolecular hydrogen-bonded interactions, all the title compounds are self-assembled into the 2-D or 3-D supramolecular networks. The fluorescence spectra show that compounds 1–3 possess fluorescence properties with emission peaks around 370 nm.