Synthesis and Crystal Structure of a Zinc(II) Complex Salt with the Schiff Base of Picolinaldehyde N-oxide and Semicarbazone

The title zinc(II) complex salt [Zn(H2O)6](ClO4)2?(PNOS)4, where PNOS is deri- ved from picolinaldehyde N-oxide with semicarbazone, has been prepared and structurally charac- terized by X-ray single-crystal analysis. It crystallizes in triclinic, space group P1 with a = 7.529(3), b = 10.206(4), c = 14.678(6) ?, α = 86.293(6), β = 87.686(7), γ = 81.382(6)o, C28H44Cl2N16O22Zn, Mr = 1093.06, V = 1112.3(8) ?3, Z = 1, Dc = 1.632 g/cm3, S = 1.089, μ(MoKα) = 0.773 mm-1, F(000) = 564, the final R = 0.0438 and wR = 0.1076 for 3888 independent reflections with Rint = 0.0224. The crystal structure possesses a [Zn(H2O)6]2+ cation, two ClO4- anions and four PNOSs. In the crystal structure, Zn2+ cation is located at the symcenter and coordinated by six water mole- cules. In [Zn(H2O)6]2+, an elongate octahedral complex cation, the average Zn–O bond length is 2.087(2) ?. There exist a lot of H bonds in the structure, linking the cation [Zn(H2O)6]2+, anion ClO4- and PNOS to form a 3D network.