Heteronuclear complexes derived from the molecular ion [Hg(SCN)4]2−: Variance in bridging matrices, nuclearities and architectures with the change in complementary units

摘要: Abstract Five neutral heteronuclear compounds of the type [M(tren)(μ-NCS) z Hg(SCN) 4− ] n [M = Cu/Zn/Cd,  = 1, 1 / 2 3 ; M = Ni,  = 2, 4 M = Pb,  = 3,  = ∞, 5 tren = tris(2-aminoethyl)amine] have been synthesized and characterized. X-ray structural analyses reveal that tetrahedral [Hg(SCN) 2− unit forms a single Hg–SCN–M end-to-end bridge with Cu(II), Zn(II) Cd(II) complementary [M(tren)(S) 2+ , affording dinuclear – respectively, trigonal bipyramidal geometry around heterometal ions. In tetranuclear four Hg–SCN–Ni bridges bind two different octahedrally coordinated Ni(II) centers forming cyclic loop. A heteropolynuclear chain heptacoordinated Pb(II) in results through alternate double NCS bridges. Multiple N–H⋯N, N–H⋯S, C–H⋯N, C–H⋯S hydrogen bonds S⋯S interactions promote increased dimensionalities. EPR variable-temperature (2–300 K) magnetic data interpreted terms their structures.