Anand Kumar Sharma

Bis(indenyl)titanium(IV) and zirconium(IV) complexes of monofunctional bidentate salicylidimines

Abstract Dichlorobis(indenyl)-titanium(IV) and -zirconium(IV), (C9H7)2TiCl2 and (C9H7)2ZrCl2, react with bidentate Schiff bases such as salicylidene aniline, salicylidene-o-toluidine, salicylidene-m-toluidine and salicylidene-p-toluidine in a 1:1 molar ratio in refluxing tetrahydrofuran in the presence of triethylamine to yield complexes of the type (C9H7)2Ti(SB)Cl and (C9H7)2Zr(SB)Cl, respectively where SB is the anion of the corresponding Schiff base, SBH. The new derivatives have been characterised on the basis of their elemental analyses, conductance measurements and spectral (IR, 1H NMR and electronic) studies.

Bis-N(p-ethoxyphenyl)dithiocarbamato complexes of Cu(II), Zn(II), Cd(II), Sn(II), Sn(IV), Ni(II) and Pd(II)

Abstract Bis- N ( p -ethoxyphenyl)dithiocarbamato complexes of copper(II), zinc(II), cadmium(II), tin(II), tin(IV), nickel(II) and palladium(II), abbreviated as Cu(PED) 2 , Zn(PED) 2 , Cd(PED) 2 , Sn(PED) 2 , Sn(PED) 2 Cl 2 , Ni(PED) 2 and Pd(PED) 2 , have been synthesized. These complexes have been characterized on the basis of elemental analyses, molecular weight determinations, conductance measurements, IR and electronic spectral studies. Thermal studies of these complexes have been carried out in a static air atmosphere to determine their mode of decomposition. Kinetic parameters such as apparent activation energy and order of reaction have been determined using the graphical method of Coats and Redfern. Heats of reaction for different decomposition steps have been calculated from the DTA curves. The intermediates obtained at the end of various thermal decomposition steps were identified on the basis of elemental analyses and IR spectral studies.

Synthesis and Characterisation of Bis(η5-Fluorenyl)N,N-disubstituted-dithiocarbamatochlorotitanium(IV) and Zirconium(IV) Componds

Abstract Some bis(η5-fluorenyl)N,N-disubstituteddithiocarbamatochloro-titanium(1V) and zirconium(1V) compounds of the type (η5-C13H9)2 Ti(S2CNRR1)Cl and (η5-C13H9)2 Zr(S2CNRR1)Cl (where R = alkyl and R′ = aryl or cyclohexyl) have been prepared by the reaction of bis(η5 -fluorenyl)titaniun(IV)dichloride and bis(η5-fluorenyl)zirconium(IV)dichloride with the sodium salt of N,N-disubstituted dithiocarbamates. A study of molecular weight, conductance, infrared spectra and magnetic susceptibility in addition to elemental analysis has been carried out to throw some light on the probable structure of these derivatives. These studies show that the complexes are monomeric, non-electrolytes in which the dithiocarbamate group acts as a bidentate ligand.

Thermal studies on titanyl and zirconyl oxalates. A review

Abstract Past work covering the year 1983 on the thermal studies on titanyl and zirconyl oxalates is reviewed.

Reactions of Dichlorobis (Cyclopentadienyl) Titanium (IV) with Bident Ate Schiff Bases Derived from Salicylaldehyde and 4-Substituted Anilines

Abstract Dichlorobis (cyclopentadienyl) titanium(IV), Cp2TiCl2, reacts with bidentate Schiff bases such as salicylidene-4-anisidine, salicylidene-4-phenetidine, salicylidene-4-bromoaniline, salicylidene-4-iodoaniline and salicylidene-4-nitroaniline in a 1:1 molar ratio in refluxing tetrahydrofuran in the presence of trimethylamine, to yield Cp2Ti (SB)Cl, where (SB)− is the anion of the corresponding Schiff base, SBH. The derivatives have been characterised on the basis of their elemental analyses, molecular weights, conductance and spectral (IR, 1H NMR and electronic) characteristics.

Thermal studies on magnesium, barium and lead zirconyl oxalates

Abstract Magnesium, barium and lead zirconyl oxalates (abbreviated as MZO, BZO and LZO, respectively) have been prepared in aqueous medium. These compounds have been characterized on the basis of elemental analysis and IR spectral studies. The thermal behaviour of these compounds has been studied with the aid of TG, DTG and DSC techniques. The graphical method of Coats and Redfern has been employed to calculate the kinetic parameters such as apparent activation energy and order of reaction. Heats of reaction for different decomposition steps have been calculated from the DSC curves. The intermediates obtained at the end of various thermal decomposition steps were identified on the basis of elemental analysis and IR spectral studies.

Isolation of dithiocarbamate anions as salts of biscyclopentadienyl titanium(IV) chelates

Abstract A series of [Cp 2 TiL] + [RR′NCS 2 ] − complexes, where L is the conjugate base of acetylacetone, benzoylacetone or 8-hydroxyquinoline and R = CH 3 , R′ = C 6 H 5 CH 2 ; R = C 2 H 5 , R′ = C 6 H 4 CH 3 ; R = H, R′ = C 5 H 9 ; RR′ = C 6 H 12 , have been synthesised in aqueous medium by the reaction of [Cp 2 TiL] + Cl − with RR′NCS − 2 Na + . Conductivity measurements in nitrobenzene solution indicate that these complexes are electrolytes. Both the IR and NMR studies demonstrate that the ligand L is chelating in all these complexes. Consequently, tetrahedral coordination about the titanium atom is proposed. In addition to these studies, elemental analyses and magnetic susceptibility have been carried out for these complexes.

Dihiocarbamate Anions as Salts of Oxinate Chelates of Titanium(IV)

Abstract (η5-Cyclopentadienyl) (η5-pyrrolyl)titanium(IV) dichloride, (η5-Sndenyl)(η5-pyrrolyl)titanium(IV)dichloride and (η5-cyclopentadienyl)(η5-indenyl)titanium(IV)dichloride, when treated with oxine in aqueous medium form ionic derivatives of the type [(η5-R)(η5-R′)TiL]+Cl− (R = C6H5, C9H7, R′ = C4H4N; R = C5H5, R′ = C9H9; L is the conjugate base of oxine). These react with dithiocarbamate anions in aqueous solution giving ionic complexes of the type (η5-R)(η5-R′)TiL]+X (X = Ne2NCS2 −, Et2NCS2 − and i-Pr2NCS2 −). IR and 1H NMR studies demonstrate that the ligand L is chelating in all the cases. Consequently, there is tetrahedral coordination about the titanium atom.

BisN(chlorophenyl)dithiocarbamato complexes of cobalt(II), nickel(II), palladium(II) and platinum(II)

SummaryCobalt(II), nickel(II), palladium(II) and platinum(II) complexes witho-(OCD),m-(MCD) andp-chlorophenyldithiocarbamate (PCD) ligands have been synthesised and characterised by chemical analyses, molecular weight determinations, conductance measurements, electronic and i.r. spectral studies. The thermal behaviour of the complexes has been studied by t.g. and d.t.a. techniques in a static air atmosphere and heats of reaction of different decomposition steps have been calculated from the d.t.a. curves. The thermal decomposition products of the complexes were identified by elemental analyses and i.r. spectra.

Bis[n(chlorophenyl)dithiocarbamato] complexes of Cu(II), Zn(II), Cd(II) and Sn(II)

Abstract Ammonium[N(o-chlorophenyl)dithiocarbamate], NH4(OCD), ammonium [N(m-chlorophenyl)dithiocarbamate], NH4(MCD) and ammonium [N(p-chlorophenyl)dithiocarbamate], NH4(PCD) and their complexes with Cu(II), Zn(II), Cd(II) and Sn(II) have been synthesised. These complexes have been characterised on the basis of chemical analyses, molecular weight determinations, conductance measurements, electronic and IR spectral studies. Thermal behaviour of the compounds has been studied with the aid of TG and DTA techniques in static air atmosphere. Heats of reaction for different decomposition steps have been calculated from the DTA curves. The end products obtained after thermal decomposition of the complexes were identified by elemental analyses and IR spectral data.