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–H O 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–H O 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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