Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1237226 | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 2010 | 6 Pages |
Abstract
The lanthanide complexes derived from (3,5,13,15-tetramethyl 2,6,12,16,21-22-hexaazatricyclo[15.3.I1-17I7-11]cosa-1(21),2,5,7,9,11(22),12,15,17,19-decane) were synthesized. The complexes were found to have general composition [Ln(L)X2·H2O]X, where Ln = La3+, Ce3+, Nd3+, Sm3+ and Eu3+ and X = NO3â and Clâ. The ligand was characterized by elemental analyses, IR, Mass, and 1H NMR spectral studies. All the complexes were characterized by elemental analyses, molar conductance measurements, magnetic susceptibility measurements, IR, Mass, electronic spectral techniques and thermal studies. The ligand acts as a hexadentate and coordinates through four nitrogen atoms of azomethine groups and two nitrogen of pyridine ring. The lanthanum complexes are diamagnetic while the other Ln(III) complexes are paramagnetic. The spectral parameters i.e. nephelauxetic ratio (β), covalency factor (b1/2), Sinha parameter (δ%) and covalency angular overlap parameter (η) have been calculated from absorption spectra of Nd(III) and Sm(III) complexes. These parameters suggest the metal-ligand covalent bonding. In the present study, the complexes were found to have coordination number nine.
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Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Sulekh Chandra, Monika Tyagi, Soni Rani, Sumit Kumar,