Rajendar D. Verma

Complexes of dichlorobis(halosulphato)titanium(IV) with pyridine, quinoline, dimethyl sulphoxide and acetylacetone

Abstract The position of the various infrared bands in the spectra of dichlorobis-(halosulphato) titanium(IV), TiCl 2 (SO 3 X) 2 with X = F, Cl, indicates the bidentate nature of the halosulphate groups. They form 1:1 adducts with pyridine, quinoline and dimethyl sulphoxide. The infrared spectra of these complexes indicate the monodentate nature of the halosulphate groups. The infrared spectra of TiCl 2 (SO 3 X) 2 ·DMSO indicate that the coordination of dimethyl sulphoxide is through its oxygen atom and not through the sulphur atom. Acetylacetone reacts with dichlorobis(halosulphato)titanium(IV) giving Ti(acac) 2 (SO 3 X) 2 which have also been characterized from their infrared spectra.

Some reactions of trifluoromethanesulfonic anhydride with various metal substrates

Abstract Reactions of trifluoromethanesulfonic anhydride with various metal substrates were carried out in an attempt to prepare metal trifluoro-methanesulfonates. New trifluoromethanesulfonates, viz; NaBi(SO 3 CF 3 ) 4 , Na 2 Te(SO 3 CF 3 ) 6 , K 2 SeO 2 (SO 3 CF 3 ) 4 and Ti(OCH 3 ) 2 (SO 3 CF 3 ) 2 have been prepared by reacting NaBi(CF 3 COO) 4 , Na 2 Te(CF 3 COO) 6 or Na 2 TeO 3 , K 2 SeO 4 and Ti(OCH 3 ) 4 respectively, with (CF 3 SO 2 ) 2 O. These compounds have been characterized by elemental analyses and infrared and 19 F NMR spectra.

2,2,2-Trifluoroethyl aryl tellurides, ArTeCH2CF3 and their derivatives Ar(CF3CH2)TeX2(Ar = C6H5, p-CH3C6H4; X = Cl, OCH2CF3): Preparation and characterization

Abstract 2,2,2-Trifluoroethyl aryl tellurides, viz; C6H5TeCH2CF3 and p-CH3C6H4TeCH2CF3 are prepared in high yields by reacting alkylating agent (2,2,2-trifluoroethyl tosylate or 2,2,2-trifluoroethyl iodide) with aryl tellurolate anion generated in situ . These tellurides have been converted to their corresponding tellurium dichlorides which on further treatment with NaOCH2CF3 in CF3CH2OH medium gave the corresponding bis(2,2,2-trifluoroethoxides). These compounds have been characterized by elemental analyses, IR, 1H and 19F NMR and mass spectra.

Diarylseleniumbis(Trifluoroacetates) and Chloro-(Trifluoro-acetates): Preparation and Characterization

Abstract Some new p-substituted diarylseleniumbis(trifluoroacetates), (RC6H4)2Se(CF3COO)2 where R = p-C2H5O, p-CH3O, p-Br, p-Cl and diarylseleniumchloro(trifluoroacetates), (RC6H4)2SeCl(CF3COO) where R = H, p-C2H5O, p-CH3O, p-CH3, p-Br or p-Cl have been prepared by the metathetical reaction between the respective selenium dichloride and silver trifluoroacetate. The compounds (RC6H4)2Se(CF3COO)2 are also obtained quantitatively by the reaction between the corresponding diarylselenoxide and tri-fluoroacetic anhydride. These compounds have been characterized by analytical data, X-ray powder diffraction, infra-red, 1H and 19F NMR and mass spectral studies.

Dioxouranium(VI) and oxouranium(IV) fluorosulphates and double fluorosulphates of uranium(IV)

Abstract UO 2 (SO 3 F) 2 , UO(SO 3 F) 2 , U(SO 3 F) 4 and MU(SO 3 F) 6 , MMg, Zn have been prepared by reacting UO 2 (O 2 CCH 3 ) 2 , U(O 2 CCH 3 ) 4 , U(O 2 CCF 3 ) 4 and MU(O 2 CCH 3 ) 6 with HSO 3 F. The analysis of i.r. spectral data of UO 2 (SO 3 F) 2 , UO(SO 3 F) 2 and MU(SO 3 F) 6 shows the presence of only one type of SO 3 F group with reduced symmetry C s . In U(SO 3 F) 4 , two SO 3 F groups are bidentate, while the other two are monodentate. A sharp band at 925 cm −1 in UO 2 (SO 3 F) 2 is diagnostic of UO 2 2+ . The diffuse reflectance spectra of UO(SO 3 F) 2 , U(SO 3 F) 4 and MU(SO 3 F) 6 reveal hexacoordination of U(IV), while the magnetic moments of these compounds support the existence of U(IV). UO 2 (SO 3 F) 2 and UO(SO 3 F) 2 decompose thermally in a single step with the evolution of SO 2 F 2 and formation of their respective sulphates.

Synthesis and Characterization of New Alkoxyalklorganyl Selenides

Abstract Alkoxyalkylorganyl selenides are obtained in quantitative yields by the reaction of 1-bromo-2-ethoxyethane or 1-bromo-2-methoxyethane with sodium organyl selenolates. The compounds have been characterized by elemental analysis, IR, 1H NMR and mass spectral data.

Vanadium (III), oxovanadium (IV) and oxovanadium (V) trifluoro-methanesulfonates

Abstract V(SO 3 CF 3 ) 3 , VO(SO 3 CF 3 ) 2 and VO(SO 3 CF 3 ) 3 have been prepared by reacting V(O 2 CCF 3 ) 3 , VO(O 2 CCF 3 ) 2 and VOC1 3 with HSO 3 CF 3 . The i.r. data suggest a bridging bidentate nature for SO 3 CF 3 groups. The diffuse reflectance spectrum of V(SO 3 CF 3 ) 3 suggests hexacoordination of vanadium, whilst that of VO(SO 3 CF 3 ) 2 is comparable to either five or six coordinated oxovanadium (IV) systems. The magnetic moments of V(SO 3 CF 3 ) 3 and VO(SO 3 CF 3 ) 2 are slightly lower than the spin-only values. Thermal decomposition of these triflates is simple. All the three triflates form coordination complexes with pyridine, 2, 2′-bipyridyl and triphenylphosphine oxide.

Chemistry of imidobis(sulphuryl chloride)-II: some novel derivatives of imidobis(sulphuryl chloride)

Abstract Silver imidobis(sulphuryl chloride), AgN(SO 2 Cl) 2 ; nitrosyl imidobis(sulphuryl chloride), NON(SO 2 Cl) 2 ; nitryl imidobis(sulphuryl chloride), NO 2 N(SO 2 Cl) 2 ; alkali metal imidobis(sulphuryl chloride), MN(SO 2 Cl) 2 (where M is Li, Na, K) and N-chloroimidobis(sulphuryl chloride), CIN(SO 2 Cl) 2 have been prepared. The compounds have been characterized by analytical and spectral techniques.

Trinuclear metal(III) trifluoroacetates@@@Dreikernige Metall(III)-Trifluoracetate

Hydrated and anhydrous trinuclear metal(III) trifluoroacetates of Cr and Fe were prepared by reaction of freshly precipitated metal oxides with trifluoroacetic acid, while manganese analogs by “acid exchange”. IR data show the presence of bidentate trifluoroacetate groups. The diffuse reflectance spectra suggest octahedral environment around metals.Mossbauer spectra show that iron atoms in the compounds are high spin hexacoordinated; two types of iron sites are suggested in hydrated iron compound. Low magnetic moment of chromium and iron compounds indicate antiferromagnetic coupling. Th anhydrous compounds decompose in single step with the evolution of (CF3CO)2O.M 3O(O2CCF3)7 form complexes [M 3O(O2CCF3)6·3Py]+ [O2CCF3]− with pyridine.

Aluminium tris(flourosulphate)

Abstract Aluminium tris(fluorosulphate) is prepared by the reaction of aluminium tris(trifluoroacetate) and fluorosulphuric acid. The IR spectrum indicates a polymeric structure containing bridging bidentate fluorosulphate groups, giving hexacoordination around aluminium. Aluminium tris(fluorosulphate) forms coordination compounds with pyridine and bipyridyl.