Sita, N. Mahalakshmi published the artcileEquilibrium studies of lanthanide(III) complexes of 1-phenyl-3-methyl-4-benzoyl pyrazolone-5 (PMBP) and 1-phenyl-3-methyl-trifluoroacetyl-pyrazolone-5 (PMTFP), COA of Formula: C12H9F3N2O2, the main research area is rare earth complex PMBP PMTFP stability; pyrazolone benzoyl fluoroacetyl lanthanide complex stability.
The stability constants of [Ln(PMBP)3.NO3] and [Ln(PMTFP)3] complexes have been determined by the potentiometric method and the values obtained practically agree for the whole series of lanthanides for both types of complexes. The “”gadolinium break”” is also evident. Under the same exptl. conditions, the competitive coordination reaction of the ligands with Ca2+ and Na+ have been carried out whose ionic radii are almost the same but their charges are different. The IR spectral studies show that in the PMBP and PMTFP complexes, the ligands are similarly coordinated by the carbonyl oxygen groups. The multiplet pattern of NMR spectra which partially disappears on coordination of the ligands shows a more rigid structure for PMBP than for PMTFP complexes.
Indian Journal of Chemistry, Section A: Inorganic, Bio-inorganic, Physical, Theoretical & Analytical Chemistry published new progress about IR spectra. 1691-93-6 belongs to class pyrazoles-derivatives, name is 5-Methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-1H-pyrazol-3(2H)-one, and the molecular formula is C12H9F3N2O2, COA of Formula: C12H9F3N2O2.
Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics