T. N. Srivastava

Thorium(IV) and zirconium(IV) complexes of oxygen donor ligands, Part 6. thorium(IV) complexes of 2,6-lutidine-N-oxide and tetramethylene sulphoxide

SummaryThe synthesis and physical properties of crystalline thorium(IV) complexes, Th(ClO4)4 · 6 LNO, ThX4 · 2 LNO (X = Br or SCN), ThX4 · 4 LNO (X = NO3 or I) andTh(ClO4)4 · 10 TMSO, Th(NO3)4 · 6 TMSO, ThX4 · 4 TMSO (X = Cl or Br), ThI4 · 6 TMSO and Th(NCS)4 · 2 TMSO (where LNO = 2,6-lutidine-N-oxide and TMSO = tetramethylene sulphoxide) are reported together with their i.r. spectra, molar conductivities, molecular weights, t. g. a. and d. t. a. data. In all the complexes, LNO and TMSO are bonded to thorium(IV) through oxygen. The coordination number of thorium(IV) in these complexes varies from six to ten depending upon the nature of the anions.

Transition metal schiff base chelates as ligands for phenyltin(IV) chlorides

SummaryBinuclear complexes of phenyltin(IV) chlorides with transition metal chelates of tetradentate Schiff bases derived from acetylacetone, benzoylacetone oro-hydroxyacetophenone and ethylenediamine or propylenediamine, of the general formula PhnSnCl4-nML (where n = 1 or 2, M = Ni11 or Cu11 and L2−= the Schiff base dianion), have been synthesised and characterized through elemental analysis, conductance and i.r. spectroscopic data. The coordination of metal chelates to tin involves two triply bonded oxygen atoms giving rise to an octahedral environment around SnIV. The molar conductance of the complexes in nitrobenzene shows the presence of the uncoordinated ML and phenyltin(IV) chloride moieties in solution.

Trioganotin (IV) Complexes of Schiff Bases Derived from S-methyl and -Benzyldithiocarbazate

Abstract Five and six coordinate complexes of triorganotin (IV) moieties with Schiff bases derived from S-methyl or -benzyldithiocarbazate and a ketone or pyridine-2-carboxaldehyde, respectively, have been synthesised and characterized by elemental analysis, molar conductance, molecular weight determination and ultraviolet and infrared spectroscopy. The complexes are nonelectrolytic and monomeric in solution.

Organotellurium(IV) Chelates of Tri-and Tetradentate Schiff Bases

Abstract Several new organotellurium(IV) chelates of the Schiff bases having the formula, R2TeL (R=phenyl, p-methoxyphenyl, p-ethoxyphenyl) or R2Te= (L2-=dianions of planar tetradentate ligands with the ONNO donor system or tridentate ligands with the ONO and SNO donor systems) have been prepared. Their structures have been examined in the solid state and in solution through spectral studies.

Synthesis and Characterisation of Some Arylmercury Trifluoroacetates

Abstract The preparation of some arylmercury trifluoro-acetates of the formulae RHgOCOCF3 (R=C6H5-, 4-CH3C6H4-, 4-CH3OC6H4-, 4-ClC6H4-, 2-HOOCC6H4-, 3,4-(CH3)2C6H3-, 2-Cl,4-CH3C6H3- or 4-C6H5C6H4-) is reported. The newly synthesised compounds have been characterised by elemental analysis, molar conductance, molecular weight, I.R., U.V. and 1H NMR data. The position of substitution of the H atom of the aromatic ring by -HgOCOCF3 has been established by the cleavage of the Hg-C bond with molecular iodine. The trifluoroacetate group in the compounds is unidentate both in the solid and solution states.

The Geometry and Thermal Stability of the Molecular Adducts of Triphenyltin Azide (Lewis Acid)

Abstract The Lewis acid behaviour of triphenyltin azide has been examined through interaction with various N- and O-donor ligands. The newly synthesised compounds have been characterised and their structure established on the basis of elemental analyses, molar conductance, molecular weight, IR, UV, 1H NMR and 13C NMR spectral studies. The thermal stability of the compounds has been examined by TGA.

Synthesis and Antiviral Activity of Biphenylenetellurium-(IV) Dichloride and Its Reaction Products

Abstract Biphenylenetellurium(IV) dichloride has been prepared and its interactions with various silver salts Ag+X−, donor bases (L) and alkylammonium chloride R4NCl have been studied. Its reduction product biphenylene tellurium(II) undergoes oxidative addition with halogens and interhalogens. It also acts as a Lewis base forming molecular adducts with strong acceptors such as HgCl2. The newly synthesized compounds have been characterized through elemental analyses, molar conductance, IR and PMR spectroscopic data. A few organotellurium derivatives show appreciable antiviral activity.

Adducts of tellurium and organotellurium(IV) chlorides with transition metal chelates of tetradentate schiff bases

SummaryCoordinative interaction between tellurium tetrachloride or aryltellurium trichloride and transition metal chelates of tetradentate Schiff bases has yielded bimetallic molecular adducts of the general formula RnTeCl4−n · ML [n = 0 or 1, R = Ph,p-MeOC6H4 orp-EtOC6H4, M = nickel(II) or copper(II) and L2− dianion of the Schiff bases derived from salicylaldehyde oro-hydroxyacetophenone and ethylenediamine]. The i.r. spectral and magnetic measurements on the complexes in the solid state indicate coordination of the metal chelates to tellurium(IV)via two phenolic oxygens. Planarity about the transition metal ion is thus retained.

Organotin(IV) isothiocyanatochromates

SummarySeveral new compounds of the type [R3Sn]3[Cr(NCS)6] and [R3Sn][Cr(NCS)4L2], where R = Ph or n-Bu and L = NH3, PhNH2 or CO(NH2)2, have been synthesized and characterized by analytical data, i.r. and electronic spectral studies. Conductance measurements indicate that the compounds are ionic.