Chemical Research in Chinese Universities ›› 2016, Vol. 32 ›› Issue (1): 1-7.doi: 10.1007/s40242-016-5333-1

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Studies on the Halogen Substituted β-Amino Acids and Their Cu(Ⅱ) Coordination Complexes in Crystallography

ZHENG Chunying, QIU Qiming, HAO Liang, LI Hui   

  1. Key Laboratory of Cluster Science, Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry, Beijing Institute of Technology, Beijing 100081, P. R. China
  • Received:2015-08-19 Revised:2015-10-18 Online:2016-02-01 Published:2015-11-13
  • Contact: LI Hui E-mail:lihui@bit.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(Nos.21071018, 21271026).

Abstract:

Halogen substituted β-amino acids, D,L-3-amino-3-(4-fluoro)phenylpropionic acid(D,L-HL1, 1) and D,L-3-amino-3-(4-bromo)phenylpropionic acid(D,L-HL2, 2), as well as their Cu(Ⅱ) coordination complexes[Cu(L1)2(CH3OH)2]·2CH3OH(3) and[Cu(L2)2(CH3OH)2]·2CH3OH(4) were investigated and their single crystal structures were discussed in details. Supramolecular helical chains were found in β-amino acids 1 and 2 while there was no helix in their coordination complexes 3 and 4. The formation of supramolecular helixes could be due to the hydrogen bonds between terminal-NH3+ and adjacent-COO- in β-amino acids 1 and 2. While, this kind of hydrogen bonds could not be observed in their Cu(Ⅱ) coordination complexes 3 and 4, in which central-symmetrical dimers could be formed via coplanar coordinated bonds(N-Cu-O) between-NH2 and-COO-.

Key words: β-Amino acid, Copper, H-Bonding, Halogen, Crystal structure