Physicochemical studies of (o-vanillin thiosemicarbazonato)-nickel(ii) chelate

Abstract

o-VTSC Ni(II) chelate 25 thiosemicarbazonato)-Summary Five-and six-membered rings result from the chelation of nickel(II) by the dibasic tridentate Schiff base ligand, o-vanillin thiosemicarbazone(o-VTSC), a new chelate prepared and characterized. The structural results are discussed in the light of spectroscopic and other data.

Synthesis, characterization, crystal structure and electrochemical behavior of a nickel(II) complex of 5,6-dihydro-2H-pyran-3-aldehyde thiosemicarbazone

“…In particular, the shifts in m(C@N) and m(NAN) provide evidence for coordination through the azomethine nitrogen atom [31][32][33]. The appearence of a new band at 480 cm À1 which correspond to the m(NiAN) vibration band is another indication of the involvement of nitrogen of the azomethine group in coordination [34][35][36].…”

Synthesis of Schiff Base (E)-2-(((3-Hydroxyphenyl)imino)methyl)-6-methoxyphenol Containing N and O Donors and its Metal Complexes: Spectral, Thermal, Redox Behaviour, Fluorescence Quenching, Antimicrobial and Anticancer Studies

“…The band at 36182 cm -1 may be due to the intra ligand charge transfer and 30120 cm -1 band is assigned to 6 A1g→ 2 T2g transition [21]. The magnetic moment value of Co(II) complex is 5.14 BM confirms the octahedral geometry whereas Mn(II) complex is 5.82 BM is confirms the distorted octahedral geometry [22] (Table-4 1 H NMR spectra of free ligand and its metal complexes were recorded in DMSO-d6. The multiplet which extends from δ 6.7 to δ 7.3 corresponds to the 7 protons of the aromatic rings [23].…”

Synthesis, characterization and antimicrobial activities of some mixed ligand complexes of Co(II) with thiosemicarbazones and N-protected amino acids

“…The n(CvN) absorption band of thiosemicarbazone moieties shifted towards lower wave number in the complexes, indicates coordination of the azomethine nitrogen [28,29] to cobalt(II) ion. This was further supported by the appearance of a new medium intensity band in the region 465 -490 cm 21 , assigned to (CoZN) mode.…”