
Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry p. 831 - 842 (2002)
Update date:2022-08-28
Topics:
Ajithkumar
Radhakrishnan
Complexes of yttrium and lanthanide nitrates with the Schiff base 2,3-dimethyl-4-formyl(benzhydrazide)-1-phenyl-3-pyrazoline-5-one (L) have been synthesized and characterized by elemental analyses, electrical conductance in non-aqueous solvents and electronic as well as infrared spectra. The complexes have the general molecular formulae [Ln(L)2(NO3)]-(NO3)2 (Ln = Y, La, Pr, Nd, Sm, Eu, Gd, Dy, Ho or Er). The ligand chelates with the metal ion in a neutral tridentate fashion through both carbonyl oxygens and the azomethine nitrogen in all of these complexes. One of the nitrate ions is monodentately coordinated and the other two remain as counter ions. A coordination number of seven is assigned to the metal in all of these complexes. The covalency parameters evaluated from solid and solution phase electronic spectra suggest weak covalent character of the metal-ligand bond.
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