Syntheses, crystal structures, weak interaction, magnetic and photoluminescent properties of two new organic-inorganic molecular solids with disubstituted benzyl triphenylphosphinium and tetra(isothiocyanate)cobalt(II) anion

摘要

Two new organic-inorganic molecular solids of tetra(isothiocyanate)cobalt(II) dianion and disubstituted benzyl triphenylphosphinium, [2Cl4FEzTPP](2)[Co(NCS)(4)] (1) and [2Cl4ClBzTPP](2)[Co(NCS)4] (2) ([2Cl(4)FBzTPP](+) = 1-(2'-chloro-4'-fluorobenzyltriphenylphosphonium) and [2Cl4CIBzTPP](+) = 1-(2',4'-dichlorobenzyltriphenylphosphonium), were synthesized and characterized by elemental analysis, FT-IR, UV-Vis spectra, ESI-MS and single crystal X-ray diffraction method. Compounds 1 and 2 crystallize in the monoclinic Pc and triclinic P-1, respectively. The Co(II) ion of the [Co(NCS)(4)](2-) anion shows a distorted tetrahedral coordination geometry. The [2Cl4FEzTPP](+) cations containing P(2) atoms in 1 form a column by the Cl center dot center dot center dot pi interactions, while the [2Cl4ClBzTPP](+) cations in 2 form two columns by the C-H center dot center dot center dot pi and pi center dot center dot center dot pi interactions. The anion and the cation are linked by C-H center dot center dot center dot S hydrogen bonds and Cl center dot center dot center dot S interactions. Magnetic susceptibility measurement in the temperature range 2-300 K shows that both 1 and 2 exhibit a weak antiferromagnetic exchange interaction as the temperature falls, and ultraviolet fluorescence emission in the solid state at room temperature. (C) 2015 Elsevier B.V. All rights reserved.