Supramolecular formation by aromatic ring stacking and hydrogen bonding in lanthanide(III) complexes with amino acids and 1,10-phenanthroline |
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Authors: | Yan Liang Zhemin Wang Lin Pei Jin Chunhua Yan |
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Institution: | a Department of Chemistry, Beijing Normal University, Beijing 100875, People's Republic of China b State Key Laboratory of Rare Earth Materials Chemistry and Application, Peking University, Beijing 100871, People's Republic of China |
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Abstract: | Eu(ABA)(phen)2(H2O)3](ClO4)3·3phen·4.5H2O (1) and Eu(Val)(phen)2(H2O)3](ClO4)3·3phen·2H2O (2) are two new europium complexes with amino acids and 1,10-phenanthroline (phen=1,10-phenanthroline, ABA=-amino butyl acid, Val=
-valine). Their crystal structures were measured by X-ray crystallography. Europium atoms in both complexes are nine-coordinated with bidentate 1,10-phenanthroline and carboxylate anion of amino acids, and water molecules. In the solid state, 1 and 2 have a structure involving aromatic stacking of the coordinated and non-coordinated 1,10-phenanthroline and the oxygen atoms of non-coordinated perchlorate anions being H-bond acceptors connect Eu(ABA)(phen)2(H2O)3]3+·3phen·4.5H2O or Eu(Val)(phen)2(H2O)3]3+·3phen·2H2O in their structures. In their interactions, several C–HO bonds play an important role. Owing to their different amino acid ligands and the number of lattice water molecules, there is some difference in their hydrogen bond patterns in 1 and 2. The side chain of
-valine is involved in the formation of C–HO bonds. Hydrogen bond and π–π interactions determine the supramolecular formation of three-dimensional net works of both complexes. |
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Keywords: | Crystal structure Europium complex Amino acid 1 10-Phenanthroline |
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