Abstract
Two new complexes of tetra(isothiocyanate)cobalt(II) dianion and meta-substituted benzyl triphenylphosphinium, [3BrBzTPP]2[Co(NCS)4] (1) and [3CNBzTPP]2[Co(NCS)4] (2) ([3BrBzTPP]+ = 1-(3′-bromobenzyltriphenylphosphonium and [3CNBzTPP]+ = 1-(3′-cyanobenzyltriphenylphosphonium), 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 P2(1)/c, and the Co(II) ion of the [Co(NCS)4]2− anion shows a distorted tetrahedral coordination geometry. The C-H···S hydrogen bonds and p···π interaction found in 1 and 2 consolidate 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.
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