title: Non-centrosymmetric coordination polymer with a highly hindered octahedral copper center bridged by mandelate.
abstract: A novel chiral coordination polymer, [Cu(C(6)H(5)CH(OH)COO)(μ-C(6)H(5)CH(OH)COO)] (1-L and 1-D), was synthesized through a reaction of copper acetate with L-mandelic acid at room temperature. Although previously reported copper mandelate prepared by hydrothermal reaction was a centrosymmetric coordination polymer because of the racemization of mandelic acid, the current coordination polymer shows noncentrosymmetry and a completely different structure from that previously reported. The X-ray crystallography for 1-L revealed that the copper center of the compound showed a highly distorted octahedral structure bridged by a chiral mandelate ligand in the unusual coordination mode to construct a one-dimensional (1D) zigzag chain structure. These 1D chains interdigitated each other to give a layered structure as a result of the formation of multiple aromatic interactions and hydrogen bonds between hydroxyl and carboxylate moieties at mandelate ligands. The coordination polymer 1-L belongs to the noncentrosymmetric space group of C2 to show piezoelectric properties and second harmonic generation (SHG) activity.
authors.affiliation: EcoTopia Science Institute, Nagoya University, Nagoya 464-8603 Japan.
authors.forename: Makoto
authors.initials: M
authors.lastname: Moriya
authors.forename: Shingo
authors.initials: S
authors.lastname: Tominaga
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Hashimoto
authors.forename: Kazuki
authors.initials: K
authors.lastname: Tanifuji
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Matsumoto
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Ohki
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Tatsumi
authors.forename: Junichi
authors.initials: J
authors.lastname: Kaneshiro
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Uesu
authors.forename: Wataru
authors.initials: W
authors.lastname: Sakamoto
authors.forename: Toshinobu
authors.initials: T
authors.lastname: Yogo