Crystal structure determination of an addition complex of N-isopropyl-salicylaldimine with zinc iodide and of bis(N-isopropyl-salicylaldiminato) zinc chelate

The crystal structures of bis(N-isopropyl)-salicylaldiminato zinc iodide [I2Zn(C20H24N2O2)] (adduct 1) and of bis-chelate-N-isopropyl-salicylaldiminato zinc (complex 2) Zn (C20H24N2O2) have been determined at room temperature by X-ray diffraction methods. Adduct 1 crystallizes in space group P21/c with a = 9.229(2), b = 10.610(2), c = 24.711(4)Å, α = ϒ = 90°, β = 94.04°, V = 2413.68 Å3, with Z = 4 units. The structure confirms the adduct nature of the compound; it shows an asymmetry with respect to the I —Zn —I plane and some additional disorder in one of the two N-isopropyl groups. Bis-chelate 2 crystallizes in orthorhombic form, space group Pbca,with a = 13.225(2), b = 19.476(2), c = 15.155(4) Å,V =3903.47 Å3,with Z = 8 units. The structure consists of monomeric units in which the zinc atom shows slightly distorted tetrahedral geometry. The structures have been solved by direct methods and refined by least- squares calculations to a final R value of 0.0296 for 3146 unique observed reflections [I≥ 3σ(I)] for adduct 1, and to an R value of 0.0339 for 2376 unique observed reflections for bis-chelate 2. © by R. Oldenbourg Verlag