Syntheses, crystal structures, weak interaction, magnetic and luminescent properties of two new organic–inorganic molecular solids with substituted chlorobenzyl triphenylphosphinium and tetra(isothiocyanate)cobalt(II) anion

• DOI: 10.1016/j.synthmet.2014.11.021
• Publication Date: 2014-12-18T06:17:02Z
• Authors: Hui-Qing Ye; Li-Jie Su; Xiang-Xi Chen; Xuan Liao; Qian-Ting Liu; Xiao-Ying Wu; Jia-Rong Zhou; Le-Min Yang; Chun-Lin Ni
• Keywords: 01 natural sciences; 0104 chemical sciences

Abstract Two new organic–inorganic molecular solids of tetra(isothiocyanate)cobalt(II) dianion and meta-substituted benzyl triphenylphosphinium, [2ClBzTPP]2[Co(NCS)4] (1) and [4ClBzTPP]2[Co(NCS)4] (2) ([2ClBzTPP]+ = 1-(2′-chlorobenzyltriphenylphosphonium) and [4ClBzTPP]+ = 1-(4′-chlorobenzyltriphenylphosphonium), were prepared and characterized by elemental analysis, FT-IR, UV–vis spectra, ESI-MS and single crystal X-ray diffraction method. Both 1 and 2 crystallize in monoclinic, and the Co(II) ion of the [Co(NCS)4]2− anion shows a distorted tetrahedral coordination geometry. The C H⋯Cl, C H⋯S hydrogen bonds were found in 1 while C H⋯S, C H⋯Co, p⋯π, C H⋯π interactions were found in 2 consolidating the stacking of the crystal. Magnetic susceptibility measurement in the temperature range 2–300 K shows that 1 and 2 exhibit a weak antiferromagnetic coupling behavior. Upon excitation at 268 nm, two molecular solids show the luminescent emission peak in the UV-light region in the solid state at room temperature.