Synthesis, growth, spectral, optical and thermal properties of a novel metal–organic family single crystal: Bis (thiocyanato) cobalt(II) di thiourea

Single crystals of bis(thiocyanato) cobalt(II) di thiourea [Co(NCS)2(N2H4CS)2]; BTCT were grown from an aqueous solution using slow evaporation technique for the first time. Interestingly, Co2+ ion present in the crystalline compound connects two N atoms of thiocyanate and four S atoms of thiourea ligands. The bridging thiourea ligands link Co ions into a one dimensional polymeric chain along [1 0 0] direction. Single crystal XRD shows that the BTCT crystal belongs to triclinic system with the space group P1¯. BTCT single crystals were subjected to FT-IR, Laser Raman, UV–vis, CHNS, TG-DTA and DSC studies. The optical study shows that the UV cut-off wavelength of BTCT in ethanol–water mixed solvent is about 310 nm. The thermal analysis of BTCT reveals that the sample is thermally stable up to 196.01 °C. The VSM study shows that Co2+ in BTCT possesses higher coercivity (32.414 μCi) and retentivity (654.62E-6 emu/g) than Mn2+ of [Hg(N2H4CS)4Mn(SCN)4]; TMTM.