Magnetic and spectroscopic characterization of the high-spin (6A1) .dblharw. low-spin (2T2) transition in an iron(III) complex of pyridoxal thiosemicarbazone

Synthesis, physicochemical properties and crystal structure of isothiocianato [2-(diphenylphosphino)benzaldehyde selenosemicarbazonato(1−)] nickel(II)

“…2), are shifted to lower energies. The m(C@N) band of a medium intensity in the spectrum of the complex, due to the effect of nitrogen coordination, is shifted to higher energies [20,22,23] and is observed at 1629 cm À1 . As a consequence of the coordination of the selenium atom the m(C-Se) band is shifted to lower energies [24,25], from 760 to 713 cm À1 .…”

Cadmium and tin complexes of Schiff-base ligands

“…PLTSC in trihydrated and anhydrous [40] forms have been reported. All the ligands (pyridoxal semi-, thiosemi-, and isothiosemicarbazones) are yellowish substances, sparingly soluble in water and organic solvents, with protonated forms exhibiting somewhat higher solubility.…”

“…[n-BuSnCl 2 (PAP)] (40) has been synthesized by direct reaction of n-BuSnCl 3 with pyruvic acid-2-pyridylhydrazone in the presence of KOH under nitrogen. Single-crystal X-ray diffraction studies indicate that 40 is six-coordinate and adopts a distorted octahedral configuration with coordination via carboxylic-O, imine-N, and pyridyl-N from the ligand [140].…”

Synthesis, characterization and thermal behavior of copper(II) complexes with pyridoxal thiosemi (PLTSC)- and S-methylisothiosemicarbazone (PLITSC)

“…1630 cm -1 , which is assigned to m(C=N) vibration of azomethine group, is as a rule shifted toward higher energy, compared to its position in spectrum of the free ligand (1618 cm -1 ) [11,23,24]. Furthermore, mostly positive shift is found for m(C-O) band, located in the 1250-1320 cm -1 range [25,26].…”

“…These shifts indicate that PLTSC in complexes 1, 1a, 2, 2a and 3 and PLITSC in 4 are coordinated via phenolic oxygen and azomethine nitrogen. In spectra of PLTSC complexes, the band corresponding to m(C=S) valence vibration, due to sulfur atom coordination, is shifted toward lower-energy region and is found in 777-912 cm -1 range [11,23], compared to the free ligand spectrum (920 cm -1 ).…”