Investigation into the Hypersensitive Transitions of Ln(III)—(1-phenyhl-3-methyl-4-benzoyl pyrazolone-5) anthranilic acid and (1-phenyl-3-methyl-4-benzoyl-pyrazolone-5) aminoantipyrine Complexes-II

Abstract

(1-phenyl-3-methyl-4-benzoyl pyrazolone-5) anthranilic acid

(PMBAA) and (1-phenyl-3-methyl-4-benzoyl-pyrazolone-5) aminoantipyrine

(PMBAAP) form complexes with lanthanides of the type

[Ln(PMBAA)₂NO₃] and [Ln(PMBAAP)₃] where Ln = La, Pr, Nd,

Sm, Eu, Gd, Tb, Dy and Y. These compounds have been characterized

from physico-chemical studies. The electronic spectra of the

Nd(III) complexes have been studied in detail to investigate the

phenomenon of hypersensitivity with respect to the coordination

environment and solvent medium. In these compounds solvents do

play a significant role to cause variation in hypersensitivity. The

oscillator strengths of the hypersensitive transitions in these compounds

show the following trend.

       [Nd(PMBAA)₂NO₃] > [Nd(PMBAA)₃phen] > [Nd(PMBAA)₃bipy]

                                                                              > [Nd(PMBAA)₂py]

        [Nd(PMBAAP)₃] > [Nd(PMBAAP)₃phen] > [Nd(PMBAAP)₃bipy]

                                                                              > [Nd(PMBAAP)₃2py].

In general Nd(III) PMBAA complexes showed greater hypersensitivity

than the Nd(III) PMBAAP complexes. IR and NMR have

also been interpreted.