Assembly structures of 1:2 nickel(II) complex of 5-methylimidazol-4-yl-methylidene-L-phenylalanine and 1:2 nickel( II) complex of its racemic ligand

作者：Shintoyo Seira; Yamauchi Suguru; Oishi Tomohiro; Matsumoto Naohide; Fujinami Takeshi^*

来源：Inorganica Chimica Acta, 2013, 406: 59-64.

DOI：10.1016/j.ica.2013.06.044

• Nickel(II) complex
• Tridentate ligand
• Phenylalanine
• 5-Methyl-4-formylimidazole
• Chiral discrimination
• Assembly process

1:2 Nickel(II) complexes of 5-methylimidazol-4-yl-methylidene-L-phenylalanine (H2LL-phe) and its racemic ligand (H2LDL-phe) were synthesized and the crystal structures of the resultant [Ni(HLL-phe)(2)]- MeOH center dot 3H(2)O (1) and [Ni(HLDL-phe)(2)]center dot 6H(2)O (2) complexes were determined. Complex 1 crystallized in an acentrosymmetric monoclinic space group, P2(1) (No. 4). The nickel(II) ion is coordinated by (N2O)(2) donor atoms from two tridentate H2LL-phe ligands and has an octahedral coordination environment. In the crystal, 1 contains only the L-isomer and forms a homochiral 2D structure through hydrogen bonding between the adjacent complex molecules. In contrast, Complex 2 crystallized into a centrosymmetric monoclinic space group, P2(1)/c (No. 14). The nickel(II) ion is coordinated by (N2O)(2) donor atoms from two H2LL-phe tridentate ligands. The coordination geometry around the nickel(II) ion is described as octahedral. In the crystal, 2 consists of [Ni(HLD-phe)(2)] and [Ni(HLL-phe)(2)] molecule that are related and forms a heterochiral 3D structure via hydrogen bonding through the crystal solvents.

• 出版日期2013-9-1