Structural and spectral studies of novel Co(III) complexes of N(4)-substituted thiosemicarbazones derived from pyridine-2-carbaldehyde

Naringenin Schiff base: antioxidant activity, acid–base profile, and interactions with DNA

“…Bands at 411, 430, and 443 cm -1 are attributable to m(M-N), m(M-S), and m(M-O), respectively. The lower intensity and the shift in frequency corresponding to m(C=S) confirmed that the complex is formed via conversion of the C=S group to thiolate, indicating that NTSC can act as a monobasic tridentate ligand [22]. The Cu-O and Cu-N stretching vibrations are expected in the range of 600-100 cm -1 , as reported in the literature [23].…”

SYNTHESIS, CHARACTERIZATION AND THERMAL STUDIES OF MIXED LIGAND COMPLEXES OF Hg(II) THIOSEMICARBAZONES WITH 2-AMINOTHIAZOLE

“…One possible reason for this might be that the lone pair electrons on the nitrogen of the amino group are more exposed whereas those present on the ring nitrogen or sulphur are sterically hindered by the presence of the amino group at the 2-position, thus favouring the coordination through the exocyclic nitrogen 21 . Observation of a band in the region 3220-3450 cm -1 indicates the existence of ν(NH)/(NH 2 ) of the thiosemicarbazones and 2aminothiazole ligands [22][23][24][25][26][27][28][29][30][31][32] compared with that the complexes (3110-3340 cm -1 ). This coordination is confirmed by the presence of a new band at 430-455 cm -1 which is assigned to the stretching frequency of metal-nitrogen ν(M-N) for all the complexes [33][34][35] .…”

Crystal structure of 3-[(E)-(2-hydroxy-3-methoxybenzylidene)amino]-1-methyl-1-phenylthiourea

“…A search of Cambridge Structural Database (Version 5.36; last updated Nov. 2014; Groom & Allen, 2014) showed three closely related structures with pyridine-2-carbaldehyde thiosemicarbazones, differing from the title compound only in the presence of one or more pyridyl groups instead of the substituted phenyl group. Two of these, namely, (E)-4-methyl-4-phenyl-1-(2-pyridylmethylene)-3-thiosemicarbazide (Rapheal et al, 2007) and di-2-pyridyl ketone 4-methyl-4phenylthosemicarbazone (Philip et al, 2004) crystallize in the same P1 space group of the title compound. The third compound, 2-benzoyl pyridine-N-methyl-N-phenylthiosemicarbazone, crystallizes in P2 1 /n.…”