Based On The Chiral Isopropyl Benzene Oxygen Acid Derivatives Of Crystal Engineering Research

In this article, we designed and synthesized a series of relational ligands whichinclude three chiral dicarboxylic acid ligands: R-（+）-2-（4-（carboxymethoxy） phenoxy）propanoic acid, R-（+）-4-（4-（1-carboxyl）phenoxy）-3-fluoro-benzoic acid andR-（+）-4-（4-（1-carboxyl）phenoxy）-3-fluoro-benzoic acid. We synthesized sevencoordination compounds with transition mentals and four compounds constructed byhydrogen bonds:[Cu（L₁）（bipy）（H₂O）]_n（1）, Cu2（L₁）₂（phen）₄（H₂O）₁₃（2）, Cu（L₁）₂（C₃H₄N₂）₄（H₂O）₂（3）,（L₁）(C₄H₁₀N₂)（4）,（L₁）(C₁₀H₈N₂)（5）,（L₁）(C₁₄H₁₄N₄)（6）,（L₁）（C₂H₈N₂）（7）,[Zn（L₂）]_n（8）,[Zn （L₂）(C₂₀H₁₁N₄)· nC₂H₅OH]_n（9）,[Co （L₂）(C₂0H₁₁N₄)· nC₂H₅OH]_n（10）,[Co L₂（H₂O）]_n·0.5H₂O （11）. Compound1,2,3areconstructed by L₁through coordinate bonds,4,5,6are compounds construced throughH bonds by L₂,8,9,10are constructed by L₂through coordinate bonds,11iscoordination compounds constructed by L₃. Both compound1and2are constructed byL₁and Cu（П）, however, X-ray diffraction indicate that compound1and2have similarmonodisperse structure, compound1shows chiral helical chain-like strcture maybe dueto the difference of auxiliary ligands and synthetic methods. Compound8showsthree-dimensional rhmbic channel structure,9and10are composed of two helicalchains building a two-dimension network structure, compound11has atwo-dimensional channel structure. Although both8and9are constructed by L₂andZn（П）, the auxiliary ligand4-4’-bis（imidazole）methl]biphenyl reduced the bridgingintroduction between the metal atoms forming a lower dimension, which is easy to forma helical structure. Structures of9and10indicated chiral ligand can induce flexibleachiral auxiliary ligand to produce a chiral structure. Coordinated water molecules in11limited the extension in a axis direction to form two-dimensional channel structure. Incompounds constructed by hydrogen bonds,4and6show zigzag chains,5has chiral helical chain and7has a circle structure. In4-7，the rigid-flexible difference betweenauxiliary ligands caused different saturation and direction of hydrogen bonding. Wespeculate that flexibility can be passed through hydrogenbonds.All compounds are characterized by elemental analysis, IR spectra, X-raydiffraction, and fluorescence spectra etc, and some exhibited good fluorescenceproperties.