Synthesis and structural study of divalent Cu, Zn, Cd and Pd complexes supported by 1,2,3-triazole-based chalcogen ligands

Abstract Transition metal complexes of the type [M{4,5-(P(E)Ph 2 ) 2 tz} 2 (thf) n ] [tz = 1,2,3-triazole; M = Cu, n  = 2, E = S( 3 ); M = Cu, n  = 0, E = Se( 4 ); M = Zn, n  = 2, E = S( 5 ); M = Cd, n  = 2, E = S( 7 ), Se( 8 ); M = Pd, n  = 0, E = S( 9 ), Se( 10 )] and [Zn 2 {4,5-(P(Se)Ph 2 ) 2 (tz)} 4 ]( 6 ) were obtained by reacting [K{4,5-(P(E)Ph 2 ) 2 tz}] with MX 2 (M = Cu, Zn, Cd, X = Cl or M = Pd, X = AcO) in a 2:1 M ratio. The structures of these compounds were investigated by IR, 1 H and 31 P NMR spectroscopy, as well as by elemental analysis. The molecular structures of 3 , 4 , 5 – 10 were determined by single-crystal X-ray diffraction. In addition, during the crystallization process of 4 , single crystals of 4a were obtained showing a structure where the replacement of a selenium atom from the non-coordinated P Se moiety by an oxygen atom gives a mixed oxygen–selenium complex. All the compounds exhibit MEPCN heterocycles as a common structural feature but in the case of 6 a bimetallic arrangement with a scorpionate-like coordination mode is also observed.