Nuclear magnetic resonance spectral study of 2-acetylpyridine4 N-alkylthiosemicarbazones and their cobalt(III) complexes

Magnetic and spectroscopic properties of copper(II) complexes with 1-salicoyl-4-phenylthiosemicarbazide

“…The signal due to CS is observed at 180.76p.p.m. in agreement with the literature (34)(35)(36)(37)(38)(39). The signal due to CO has been assigned at 158.97 p.p.m., which is close to the reported value for the CO group in pyridoxal isonicotinyl hydrazone 061.61 p.p.m.)…”

“…spectrum (d6-DMSO) with those of thiosemicarbazides (32'33), thiosemicarbazones (34)(35)(36)(37)(38)(39) and other salicyl derivatives (4~ leads to the following conclusions. The 1H signals due to the hydrazido group NH's both appear as a broad band at ca 9.91 p.p.m, and the amido NH attached to phenyl group is upfield at 7.49 p.p.m.…”

Preparation, Structural Characterization, and Antifungal Activities of Complexes of Group 12 Metals with 2-Acetylpyridine- and 2-Acetylpyridine-N-oxide-4N-phenylthiosemicarbazones

“…The N±N distances are less than the 1.44 A Ê accepted as typical of single N±N bonds, and agree well with those of similar thiosemicarbazones [6,7]. The C±S distances are intermediate between those of single and double C±S bonds, 1.82 and 1.56 A Ê respectively [8], showing the partial double bond character implied by the canonical structures usually considered for thiosemicarbazones in solution [9,10]. The azomethine bond lengths are likewise short enough to im-E. Bermejo, A. Castin Ä eiras, R. Domõ Ânguez, R. Carballo, C. Maichle-Mo È ûmer, J. Stra È hle, D. X. West…”

Copper(II) complexes of 6-methyl-2-formylpyridine 4N-substituted thiosemicarbazones

“…24000 cm-1, due to a n --* n* transition of the thiosemicarbazone moiety (1~). This latter band is much more prominent in heterocyclic thiosemicarbazones in which the tautomeric form, E', featuring a conjugated function, is present (13). This band is more easily discernible in DMSO solution and is stronger and more distinct in the spectra of the 4N-dialkyl-and 3-azacyclothiosemicarba- Table 3.…”