Five new complexes based on 1-phenyl-1H-tetrazole-5-thiol: Synthesis, structural characterization and properties

Abstract Five new complexes based on 1-phenyl-1 H -tetrazole-5-thiol (Hptt): 1,1′-diphenyl-5,5′- dithiodi-tetrazole (abbreviated as dptt) ( 1 ), {[Co 2 (OH) 2 (2,2′-bipy) 2 (Hptt) 2 ]·(ptt) 2 ·(H 2 O) 2 }( 2 ), [Cd 2 I 2 (2,2′-bipy) 2 (ptt) 2 ] ( 3 ), [Co(ptt) 2 ] n ( 4 ) and [Cd(ptt) 2 ] n ( 5 ), have been synthesized and fully characterized by elemental analyses, thermogravimetric analysis, powder X-ray diffraction, IR spectra and single-crystal X-ray diffraction. Structural analysis indicated that compound 1 is an organic matter generated from in situ oxidative coupling reaction of Hptt ligands under the help of Fe 3+ ion. In compound 2 , two Hptt ligands adopting μ 2 - κ N, κ S bridging mode and two μ 2 -OH¯ bridge two Co(2,2′-bipy) fragments into a[Co 2 (OH) 2 (2,2′-bipy) 2 (Hptt) 2 ] 2+ core with short Co⋯Co distance (2.8185(10) A). In compound 3 , two Cd centers are joined into a dinuclear complex with short Cd⋯Cd distance (3.9282(14) A) by two ptt¯ anions in μ 2 - κ S, κ S bridging mode. Compounds 4 and 5 are isostructural and both feature one-dimensional (1D) looped chain structures containing 8-membered [M 2 S 2 C 2 N 2 ] rings (M = Co for 4 , M = Cd for 5 ). Variable-temperature magnetic susceptibility measurement of compounds 2 and 4 reveal strong antiferromagnetic interactions between Co centers. The fluorescent properties of compounds 1 , 3 and 5 are investigated in the solid state.