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Synthesis and crystal structures of quadruply carboxylate-bridged dimeric lanthanide(III) complexes of betaine

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Abstract

Three dimeric lanthanide(III) complexes, [Eu2(bet)8(H2O)4](CIO4)6 (1), [Tb2(bet)8(H2O)4](ClO4)6 (2), and [Eu2(bet)4(H2O)8] Cl6·6H2O (3) (bet = Me3N+CH2COO−, trimethyl-aminoacetate), have been prepared and structurally characterized by X-ray crystallography. Complex 1 crystallizes in the monoclinic space group P21/c, with a = 11.7807(8), b = 27.757(5), c = 11.7980(8) Å, β = 99.500(4)°, V = 3805.1(8) Å3, and Z = 2. Complex 2 is isomorphous to complex 1, crystallizing in the monoclinic space group P21/c, with a = 11.7769(14), b = 27.725(3), c = 11.795(5) Å, β = 99.668(14)°, V = 3797(2) Å3, and Z = 2. Complex 3 crystallizes in the orthorhombic space group Pbca, with a = 12.5664(8), b = 17.8645(9), c = 22.2573(8) Å, V = 4996.6(4) Å3 and Z = 4. Both complexes 1 and 2 comprise quadruply carboxylate-O,O′-bridged [M2(bet)4]6+ dimeric cores (M = Eu, Tb), and each metal ion is further coordinated by two terminal aqua ligands and two monodentate bet carboxylates to form a distorted square-antiprismatic coordination geometry. Complex 3 also has a [Eu2(bet)4]6+ core, in which two bet ligands act in the η1:η1:μ2 bridging fashion, and the other two bet ligands in the less common η2:η1:μ2 bridging fashion, namely bridging-chelate mode. Each europium(III) ion in complex 3 is further coordinated by four water molecules to complete a monocapped square antiprism.

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Authors and Affiliations

  1. Department of Chemistry, Zhongshan University, Guangzhou, 510275, China

    Guang Yang, Hui-An Chen & Xiao-Ming Chen

  2. Chengdu Institute of Organic Chemistry, the Chinese Academy of Science, Chengdu, 610041, China

    Zhong-Yuan Zhou

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  1. Guang Yang
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  2. Hui-An Chen
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  3. Zhong-Yuan Zhou
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  4. Xiao-Ming Chen
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Yang, G., Chen, HA., Zhou, ZY. et al. Synthesis and crystal structures of quadruply carboxylate-bridged dimeric lanthanide(III) complexes of betaine. Journal of Chemical Crystallography 29, 309–316 (1999). https://doi.org/10.1023/A:1009573801943

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