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Citation: LIANG Fu-Pei, MA Lu-Fang, HUANG Shi-Wen, HUANG Yan-Qiang. Synthesis、Crystal Structure and Antibacterial Activity of β-Alanine Complexes with Nd、Gd、Er[J]. Chinese Journal of Applied Chemistry, ;2004, 21(1): 58-63. shu

Synthesis、Crystal Structure and Antibacterial Activity of β-Alanine Complexes with Nd、Gd、Er

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a Department of Chemistry & Chemical Engineering, Guangxi Normal University, Guilin 541004;
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b Department of Chemistry, Luoyang Teacher's College, Luoyang;
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c Youjiang Medical College for Nationalities, Baise

Corresponding author: LIANG Fu-Pei,
Received Date: 30 April 2003
Available Online: 30 August 2003
Fund Project: 广西自然科学基金资助项目(桂自9912044) (桂自9912044)

Three β-alanine complexes with rare earths, {[Ln₂(β-ala)₆(H₂O)₄](ClO₄)₆·H₂O}_n(Ln=Nd(1), Gd(2), Er(3)), were synthesized and characterized by elemental analysis and IR. The crystal structures of three complexes were determined by X-ray diffraction method. All complexes crystallize in triclinic P1 space group with (1):a=1.2913(3)nm,b=2.1765(4)nm,c=0.93682(19)nm,α=99.07(3)°,β=96.91(3)°,γ=76.75(3)°,Z=2,D_c=1.988Mg/m³,F(000)=1502,R₁=0.0547,wR₂=0.1408;(2):a=1.2911(3)nm,b=2.1679(4)nm,c=0.92717(19)nm,α=98.94(3)°,β=97.00(3)°,γ=76.85(3)°,Z=2,D_c=2.050Mg/m³,F(000)=1518,R₁=0.0522,wR₂=0.1430;(3):a=1.2880(3)nm,b=2.1629(4)nm,c=0.92103(18)nm,α=98.77(3)°,β=97.29(3)°,γ=76.92(3)°,Z=2,D_c=2.100Mg/m³,F(000)=1534,R₁=0.0615,wR₂=0.1752 for Er complex. All three complexes have similar structures with one-dimensional infinite chain. The rare earth ion in the complexes is nine-coordinated in a distorted monocapped square antiprism geometry with seven oxygen atoms from six β-ala-nine molecules and two oxygen atoms from two water molecules. The average bond length of Ln-O(carboxyl) from Nd to Er complexes shortens with the increase of the atomic number of rare earth. The antibacterial activity of the complexes and β-alanine was tested. The complexes were more bacteriostatically active than the ligand.
- rare earth complex,
- β-alanine,
- antibacterial activity
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