STRUCTURE OF ZINC(II) (RS)-1-ISOPROPYL CITRATE TETRAHYDRATE

catena-Poly{diaquazinc-mu-[1-isopropyl citrato(2 -)-kappa-O,kappa-O',kappa-O'':kappa-O''']}, [Zn(C9H12O7)(H2O)2].2H2O, M(r) = 369.62, monoclinic, P2(1)/c, a = 9.934 (4), b = 29.692 (3), c = 8.941 (4) angstrom, beta = 144.73 (2)degrees, V = 1522.7 (7) angstrom3, Z = 4, D(m) = 1.610 (3), D(x) = 1.612 Mg m-3, lambda(Cu K-alpha) = 1.54178 angstrom, mu = 2.741 mm-1, F(000) = 768, T = 283 K, final R = 0.0346 for 2089 observed reflections. Each 1-isopropyl citrate chelates to a diaquazinc ion in a tridentate manner through the end carboxyl, the central carboxyl and the hydroxyl O atoms and bridges another diaquazinc ion with its end carboxyl O atom. This leads to extended chelated strips with bridged Zn atoms. Other water molecules are hydrogen bonded to the aqua ligands or 1-isopropyl citrates of the chelated strips. The strips are packed through van der Waals bonds.