Jaeun Kang

[M(rac-N-benzyl Asp)(H2O)] (M = Co, Ni): Noncentrosymmetric Coordination Polymeric Chains with Racemic Chiral Ligands

The hydrothermal reaction of fumaric acid, benzylamine, and metal salts yielded M[(rac-N-benzyl-Asp)(H(2)O)] (M = Co, Ni), 1 and 2, and Ni[(rac-N-benzyl-Asp)(H(2)O)(3)]·H(2)O 3. Under mild hydrothermal conditions, Michael addition of benzylamine to fumaric acid led to the formation of a racemic mixture of N-benzyl aspartic acid enantiomers. The noncentrosymmetric structures of 1 and 2 consist of one-dimensional polymeric chains in which metal cations are bridged by d- and l-N-benzyl aspartate anions alternating along the chain. The centrosymmetric structure of 3 is composed of discrete Ni[(rac-N-benzyl-Asp)(H(2)O)(3)] units that are connected by hydrogen bonds into layers. The single layers are homochiral but are hydrogen bonded to similar homochiral layers that contain the N-benzyl aspartate with the opposite handedness. Compounds 1 and 2 showed second harmonic generation (SHG), and their magnetic and thermodynamic properties are described.

Crystal structure of diaqua-bis(3,3-dimethylacrylato-κ2O,O′)zinc(II), C10H18ZnO6

Abstract C10H18O6Zn, monoclinic, P2/c (no. 13), a = 11.0730(2) Å, b = 5.52600(10) Å, c = 10.8410(2) Å, β = 100.350(1)°, V = 652.56(2) Å3, Z = 2, Rgt(F) = 0.0318, wRref(F2) = 0.0842, T = 293(2) K.

Crystal structure of 4-phenylbutylammonium dihydrogenphosphate, [C6H5(CH2)4NH3)](H2PO4)

C10H18NO4P, orthorhombic, Aba2 (no. 41), a = 7.218(1) Å, b = 36.600(7) Å, c = 9.188(2) Å, V = 2427.2 Å, Z = 8, Rgt(F) = 0.043, wRref(F ) = 0.105, T = 296 K.