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

Two new organic-inorganic molecular solids of tetra(isothiocyanate)cobalt(II) dianion and metasubstituted benzyl triphenylphosphinium, [2C1BzTPI12[Co(NCS)41 (1) and [4C1BzTPI12[Co(NCS)41 (2) ([2C1BzTPE] =1-(2'-chlorobenzyltriphenylphosphonium) and [4C1BzTPIT=1-(4'-chlorobenzyltriphenylphosphonium), were prepared and characterized by elemental analysis, FT-IR, UV-vis spectra, ESIMS and single crystal X-ray diffraction method. Both land 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" " "1T, C H" ".7r 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. (C) 2014 Elsevier B.V. All rights reserved.