4-Aminoantipyrine schiff-base complexes of lanthanide and uranyl ions

Synthesis and Spectroscopic Study for Pt (IV) Complexes with 4-Aminoantipyrine and Sodium Pyrophosphate

“…The coordination of the NH 2 group has been also confirmed from the shifts of its bending vibration found at (1647) cm -1 in the spectra of the ligand which was shifted to lower frequency in the spectrum of complexes to (1616, 1620) cm -1 . The band at (1678) cm -1 stretching vibration which refers to υC=O for 4-AAP ring of the free ligand, was shifted to lower frequency at (1635,1648) cm -1 in the spectra of complexes, showing that the coordination between oxygen atom of this group (C=O) and metal ions was happened [8,9]. In spectra of complexes [Pt (4-AAP) (Pyph)], the bands show two peaks due to consistency (P-O-P) appeared at (1118, 1149) cm -1 and (P=O) appeared at (910) cm -1 .…”

Studies on Coordination Behaviour of a Polydentate Schiff Base in Presence of Dimethyl Sulphoxide on Rare Earth Metal Ions

“…As a consequence of coordination from azomethine nitrogen and ring carbonyl oxygen, the double bond character is reduced [1,2] . The strong band observed at 1717 and 1587 cm -1 in the spectra of complexes are tentatively assigned to combination bands of  C= C and  C= N of pyridine ring which remain practically unchanged, revealing the non-involvement of the coordination of pyridine nitrogen [8] .…”

“…In all these complexes, the potential donor atoms were reported to be ring carbonyl oxygen, imino nitrogen and pyridine nitrogen [1,2] . Hence it is most interesting to study the coordination behaviour of this ligand in presence of coordinating oxygen donor ligand such as dimethyl sulphoxide and monovalent nitrate ion.…”

Synthesis and Characterization of Some Seven Coordinated Complexes of Lanthanide(iii) Perchlorates with 4-[n-(4‘- Ethylbenza-lideneamino)]- Antipyrine Semicarbazone as Primary Ligand and Pyridine as Secondary Ligand

“…Literature reveals that certain drugs showed increased activity when administered in the form of its metal chelates compared to the virgin form. The complexing behavior of 4-aminoantipyrine has been modified into a flexible ligand system by condensing it with a variety of reagents [9][10][11][12][13] . A number of reports are available on the coordination abilities of thiosemicarbazones of 4-aminoantipyrine 14-16 with different metal ions but comparatively less is known about the mixed ligand complexes of lanthanide(ΙΙΙ) ions with substituted 4-aminoantipyrine.…”