Structure studies of Ni(II) complexes with picolinaldehyde N-oxide thiosemicarbazone

Direct Synthesis of Amides from Coupling of Alcohols and Amines Catalyzed by Ruthenium(II) Thiocarboxamide Complexes under Aerobic Conditions

“…Thus, the spectra confirm the coordination of thiol sulfur and pyridine nitrogen to ruthenium and the formation of a five-membered chelate ring. This is further confirmed by the presence of ν Ru–N and ν Ru–S bands at 440–464 and 417–418 cm –1 in the far-IR frequency region of the complexes . The absorption bands at 1946–1951 cm –1 were attributed to the terminally coordinated carbonyl group and the shift of this band by 26–64 cm –1 to higher frequency than in the precursor complexes .…”

Ruthenium(II) carbonyl complexes of dehydroacetic acid thiosemicarbazone: Synthesis, structure, light emission and biological activity

“…For all complexes, a strong band in the region 1952-1954 cm À1 is due to the terminally coordinated carbonyl group and is observed at higher frequency than in the precursor complexes. The spectra of the free dhatsc ligand show strong bands at 3380 cm À1 due to the NH 2 group [43] and at 1682 cm À1 for (m C@O ) lactone carbonyl groups. These absorption remains same even after the coordination indicates that the groups are not involved in coordination.…”

Bonding and structure trends of thiosemicarbazone derivatives of metals—An overview

“…The ligand is uninegative tridentate (P, N 3 , S-donor atoms) in complex [Ni(L)Y] NO 3 133 [204]. The neutral ligands coordinate to the metal center, via N 4 , N 3 , Sdonor atoms in the ionic complexes, [Ni(HL) 2 ]X 2 (X = Cl, ClO 4 , NO 3 ) 152-158 [176,217,143,[220][221][222][223], and via O, N 3 , S-donor atoms (oxygen is from neutral -OH group) in complexes 159 [224] and 160 [225] have octahedral (161) or trigonal bipyramidal (162) structures and N 3 atoms are axial in the latter.…”