Cyclohexanone selenosemicarbazone: A convenient starting material for the preparation of functionalised selenosemicarbazones and their Pt and Pd complexes

Synthesis, characterization and antitubercular activities of heterocyclic selenosemicarbazones

Reaction of cyclohexanoneselenosemicarbazone with aldehydes and ketones containing heterocyclic rings (2-oxindole, 6-cholro-2-oxindole, 3-methyl-2-oxindole, isatin, 1-methyl isatin, furfural, pyrrole-2-carboxldehyde) in ethanol yielded, respective, selenosemicarbazones {2-oxindoleselenosemicarbazone (2-HOxsesc,H¹L), 6-chloro-2-oxindole selenosemicarbazone (6-ClHOxsesc, H²L), 3-methyl-2-oxindole selenosemicarbazone (3-MeHOxses, H³L), isatinselenosemicarbazone (HIstsesc, H⁴L), 1-methyl isatinselenosemicarbazone (1-MeHIstsesc, H⁵L), 2-thiopheneselenosemicarbazone (2-Hthiosesc, H⁶L), 2-furfuralselenosemicarbazone (2-Hfursesc, H⁷L) and 2-pyrrole selenosemicarbazone (2-Hpysesc, H⁸L)}. However the similar reaction with aldehyde containing single aromatic ring (3-chlorobenzaldehyde and 4-chlorobenzaldehyde) formed 1, 2-bis(3-chlorobenzylidiene) hydrazine (A) and 1, 2-bis(4-chlorobenzylidiene) hydrazine (B) rather than selenosemicarbazone. All the synthesized compounds were characterized using IR and NMR (¹H, ¹³C) spectroscopy. Structure of A and B were confirmed by single crystal X-ray crystallography. The synthesized selenosemicarbazones were tested for their anti-tubercular activities and H¹L, H³L, H⁵L and H⁶L are found to exhibit excellent anti-TB activity. The experimental data will give an opportunity to examine their anti-tubercular activities and identify the lead molecule.

Acylselenoureas, selenosemicarbazones and selenocarbamate esters: Versatile ligands in coordination chemistry

Acylselenoureas, selenosemicarbazones and selenocarbamate esters from complexes with various transition- and main-group-metals, adopting several coordination modes.