Synthesis And Characterization Of Lanthanide-Benzoata Complexes
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Date
2011-10
Authors
Ooi, Ping Howe
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Sixteen complexes and three single crystals of lanthanide-benzoato were
synthesized with normal refluxing and solvothermal method. The structures of the
three crystals were characterized using single crystal X-ray crystallography.
[Nd2(C7H5O2)6(C12H8N2)2], [Eu2(C7H5O2)6(C12H8N2)22(C7H6O2)] and
[Tb2(C7H5O2)6(C12H8N2)22(C7H6O2) all adopted triclinic crystal system with P-1
space group. The three lanthanide-benzoato crystals adopted nine-coordination
environment. Hydrogen bonding can be found showing the interaction between
molecules in the crystals itself.
All the complexes were characterized by means of elemental analysis, fourier
transform infrared-red (FTIR) spectroscopy, thermogravimetric analysis and
photoluminescence spectroscopy. The FTIR results show that the carboxylic group in
the complexes coordinated to the rare earth ions in the form of monodentate and
bidentate, and the ester carboxylic groups have taken part in the coordination.
Nitrogen atoms from 1,10-phenanthroline coordinated to the rare earth ions in the
single crystal complexes in the form of bidentate as well. Among these complexes,
Eu(III) and Tb(III) complexes showed good photoluminescence emission compared
with that of Sm(III) and Nd(III) complexes.
Description
Keywords
Synthesis and characterization of , chlorine-free polycyclotriphosphazene