Roy, Ajoy ; Nag, K. (1978) Investigation on the Lanthanoid Chelates of 1-Phenyl-3-methyl-4-benzoyl-5-pyrazolone: an examination of the phenomenon of hypersensitivity Bulletin of the Chemical Society of Japan, 51 (5). pp. 1525-1529. ISSN 0009-2673
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Official URL: http://www.journalarchive.jst.go.jp/english/jnlabs...
Related URL: http://dx.doi.org/10.1246/bcsj.51.1525
Abstract
1-Phenyl-3-methyl-4-benzoyl-5-pyrazolone (Hpmbp) form complexes with lanthanoids of the type Ln(pmbp)3 · nH2O (n=4 for La-Sm, and n=1 for Eu-Yb and Y), Ln(pmbp)3 · 2pyridine·2H2O, Ln(pmbp)3 · (2,2'-bipyridine/1,10-phenanthroline)·C2H5OH, NH4[Ln(pmbp)4]·C2H5OH and Q+[Ln(pmbp)4]·C2H5OH, where Q+ is the quaternary ammonium cation of piperidine, pyrrolidine or morpholine. These compounds have been characterized from physicochemical 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 solvent does not play a significant role to cause variation in hypersensitivity. The oscillator strengths of the hypersensitive transition in these compounds show the following trend: Q+[Nd(pmbp)4]>Nd(pmbp)3·phen>Nd(pmbp)3·bpy>Nd(pmbp)3·2py·2H2>O>Nd(pmbp)3>·2H2O. In the Pr(III) complexes the band due to 3H4→1D2 transition has been found to be hypersensitive, and the gradation of intensity due to this band follows almost the same trend as in the corresponding Nd(III) complexes.
Item Type: | Article |
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Source: | Copyright of this article belongs to Chemical Society of Japan. |
ID Code: | 87781 |
Deposited On: | 22 Mar 2012 07:59 |
Last Modified: | 22 Mar 2012 07:59 |
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