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

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• 作者：Junghwan Do ; Yumi Lee ; Jaeun Kang ; Yong Sun Park ; Bernd Lorenz ; Allan J. Jacobson
• 刊名：Inorganic Chemistry
• 出版年：2012
• 出版时间：March 19, 2012
• 年：2012
• 卷：51
• 期：6
• 页码：3533-3539
• 全文大小：424K
• 年卷期：v.51,no.6(March 19, 2012)
• ISSN：1520-510X

文摘

The hydrothermal reaction of fumaric acid, benzylamine, and metal salts yielded M[(rac-N-benzyl-Asp)(H₂O)] (M = Co, Ni), 1 and 2, and Ni[(rac-N-benzyl-Asp)(H₂O)₃]路H₂O 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)(H₂O)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.