Synthesis, characterization and crystal structures of two binary acid complexes based on L-glutamate and L-aspartate.

Two amino acid complexes, [Cd(L-glu)(H2O)]n · nH2O (1) and [Co(L-asp)(phen)(N3)] · 2H2O (2) (L-glu = L-glutamate, L-asp = L-aspartate, phen = 1,10-phenanthroline), have been synthesized and characterized by elemental analyses, IR spectra and TG-DSC analysis. Single crystal X-ray structure analyses revealed that each L-glutamate acts as a pentadentate ligand binding to three octahedral Cd(II) atoms through the amino group and two carboxyl groups to form a neutral helical network. Complex 2 is a mononuclear compound in which Co(III) is octahedrally coordinated by tridentate L-aspartate, monodentate azide and chelating phen ligand. Thermal stability and fluorescence of 1 have been investigated. The complex shows strong blue fluorescence in the solid state. [ABSTRACT FROM AUTHOR]