Synthesis and Reactivity of Some α,α′-Bis(2- and 4-Substituted Benzoyl)Tellurium Dichlorides

Monobasic (ON) bidentate Schiff base ligand has been prepared by condensing o-hydroxybenzaldehyde with 3-aminopyridine. The new organyltellurium(IV) complexes, having formula [TeCl 3 (3-APY-{Sal})], [RTeCl 2 (3-APY-{Sal})] and [R 2 TeCl(3-APY-{Sal})] have been synthesized by reacting equimolar ratio of Schiff base (3-APY-{SalH}) with TeCl 4 , RTeCl 3 and R 2 TeCl 2 : where R=4-methoxyphenyl, 4-hydroxyphenyl, 3-methyl-4-hydroxyphenyl. The characterization of Schiff base and its complexes were carried out by elemental analyses, conductivity measurements, FTIR and 1 H NMR spectral studies. Also, the biological activities (antifungal and antibacterial) of the Schiff base ligand and some of its tellurium(IV) complexes have been studied.

Section: Infrared Spectramentioning

confidence: 64%

Tellurium(IV) Complexes Containing Bidentate Schiff Base and their Biological Activities

2018

“…The broad band appearing around 3064 cm -1 in free ligand assignable to υ (OH) vibration mode is absent in the spectra of complexes suggesting the coordination through oxygen of phenolic group to the tellurium centre. In the spectra of complexes, the bands observed in the 289-290 cm -1 and 418-419 cm -1 region might be due to υ (Te-O) 54,55,[58][59][60] and υ (Te-N) 60 further support the involvement of phenolic oxygen, azomethine and pyridine nitrogen atoms of Schiff base in the coordination. Further, presence of aryl groups of Rte and R 2 Te may result in mixing of certain bands, thus making independent assignments very difficult.…”

Section: Infrared Spectramentioning

confidence: 99%

Synthesis, Spectral and Antimicrobial Studies of Some O-Vanillin-2-aminopyridine Schiff Base Complexes of Organyltellurium(IV)

2018

The reactions of tellurium(IV) derivatives, TeCl 4 , RTeCl 3 and R 2 TeCl 2 with monobasic ONN tridentate Schiff base ligand derived by the condensation of o-vanillin with 2-aminopyridine have been carried out to give tellurium(IV) complexes, [TeCl 3 (2-APY-{o-Van})], [RTeCl 2 (2-APY-{o-Van})] and [R 2 TeCl(2-APY-{o-Van})]: where R = p-methoxyphenyl, p-hydroxyphenyl, 3-methyl-4-hydroxyphcenyl. The synthesized Schiff Base (2-APY-{o-VanH}) and their complexes were characterized by elemental analyses, conductivity measurements, FT-IR and proton NMR spectral studies. The Schiff base and some of their tellurium(IV) complexes display antifungal and antibacterial activities.

“…No. The two new bands appear in range 281-293 cm -1 and 415-425 cm -1 assigned due to ν (Te-O) [49][50][51][52] and ν (Te-N) mode 53 of vibration. Thus, IR data predict the bidentate nature of the Schiff base (VL-AAP) involving azomethine nitrogen atom and carbonyl oxygen of pyrazolone ring give rise to six membered chelate rings with the tellurium centre having distorted octahedral geometry.…”

Section: Compoundmentioning

confidence: 99%

New Aryltellurium(IV) Complexes Containing NO Donor Schiff Base Derived from Vanillin and 4-Aminoantipyrine

2017

A novel bidentate Schiff base derived from vanillin and 4-aminoantipyrine, form 1:1 complexes with aryltellurium(IV) trichlorides and diaryltellurium(IV) dichlorides of the type VL-AAP.ArTeCl 3 and VL-AAP.Ar 2 TeCl 2 (where Ar = p-methoxyphenyl, p-ethoxyphenyl, p-hydroxyphenyl and 3-methyl-4-hydroxyphenyl and VL-AAP =Schiff base). These complexes have been characterized by elemental analyses, molar conductance, IR and 1 H NMR spectroscopy. On the basis of these studies the donor sites have been identified as carbonyl oxygen of the pyrazolone ring and nitrogen atom of azomethine group (CH=N) to give five membered chelate ring with tellurium centre having Ψ-octahedral geometry. The synthesized ligand and its aryltellurium complexes were screened for their antimicrobial activity against various bacterial and fungal strains.