“Gadolinium (III) and europium (III) L-glutamates: Synthesis and characterization”

BEATRIZ C. BARJA; RICARDO BAGGIO; RAFAEL CALVO; MARÍA T. GARLAND; MIREILLE PEREC; ALBERTO RIZZI

INORGANICA CHIMICA ACTA

ELSEVIER SCIENCE SA

Año: 2006 vol. 359 p. 3921 - 3926

0020-1693

Two lanthanide(III) complexes with L-glutamate ligands [{Ln2(L-Glu)2(H2O)8} Æ 4(ClO4) Æ 2.5H2O]n (Ln = Gd (1), Eu (2)) have been prepared and characterized by single-crystal X-ray di.raction. The compounds are isomorphous with in.nite cationic 2D layers stacked together by secondary bonds. The building blocks are slightly di.erent non-centrosymmetric dinuclear units placed in alternating layers, the resulting structures thus containing four non-equivalent Ln metal sites. The dinuclear units contain a fourfold bridge, two in the prepared and characterized by single-crystal X-ray di.raction. The compounds are isomorphous with in.nite cationic 2D layers stacked together by secondary bonds. The building blocks are slightly di.erent non-centrosymmetric dinuclear units placed in alternating layers, the resulting structures thus containing four non-equivalent Ln metal sites. The dinuclear units contain a fourfold bridge, two in the L-glutamate ligands [{Ln2(L-Glu)2(H2O)8} Æ 4(ClO4) Æ 2.5H2O]n (Ln = Gd (1), Eu (2)) have been prepared and characterized by single-crystal X-ray di.raction. The compounds are isomorphous with in.nite cationic 2D layers stacked together by secondary bonds. The building blocks are slightly di.erent non-centrosymmetric dinuclear units placed in alternating layers, the resulting structures thus containing four non-equivalent Ln metal sites. The dinuclear units contain a fourfold bridge, two in the g1:g1:l2 and two in the g2:g1:l2 modes, from two a- and two c-carboxylates of four di.erent L-Glu residues, respectively.1:g1:l2 and two in the g2:g1:l2 modes, from two a- and two c-carboxylates of four di.erent L-Glu residues, respectively.