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Mononuclear complex [Co(cdm)2(H2O)4]@2H2O was synthesized by sodium carbamyldicyanomethanide (Nacda) and cobalt perchlorate. The crystal belongs to monoclinic system, space group P21/n with a = 9.366(3), b = 7.392(3), c = 12.039(4)?, β = 108.335(4)°,