Research
Triarylantimony(V) Dicarboxylates: Synthesis, Characterisation and Reactions
A series of new triarylantimony(V) dicarboxylates of the general formula Ar3SbL2 (where Ar = C6H5and L = C6H5CONHCH2COO–, C6H2(OH)3COO–, C6H5COO–, C6H5C2H2COO–, C6H4(OH)COO–, (C6H5)2(OH)C.COO–) have been prepared by the reaction of triarylantimony(V) dichloride and a carboxylic acid in the presence of triethylamine as well as the metathesis of sodium or silver salt of the carboxylic acid andtriarylantimony(V) dichloride. The newly synthesized compounds have been characterized by conventional methods. A tentative trigonalbipyramidal structure is suggested in which (OCOR) group occupy axial position and the three organic groups are situated at the equatorial position. The melting points of compounds did not change even after prolong stirring with water at room temperature for several hours indicating their hydrolytic stability.
Preparation, Characterisation and Reactions of Symmetrical and Unsymmetrical Tris(Pentafluorophenyl)Antimony(V) Amides
Several new symmetrical and unsymmetrical amides of the types (Rf)3Sb(NR2)2 and (Rf)3RSb(NR2) (where, Rf = C6F5; R = C6H5 and NR2 = have been prepared by the metathesis of (Rf)3SbCl2 or (Rf)2RSbCl with the appropriate metal salts of the organic ligands. The amide derivatives were also obtained by the interaction of pentafluorophenylantimony(V) chloride with organic ligand(1:1 &1:2 molar ratio) using triethylamine as hydrogen chloride acceptor. The newly synthesized compounds have been characterized by conventional methods. A tentative trigonal bipyramidal structure is suggested for these compounds. The failure of reaction between (Rf)3Sb(NR)2 and CS2 even after prolonged refluxing may be attributed to the weak dipole nature of the CS2 and the presence of electron withdrawing group on antimony amide.
Preparation, Characterisation and Reactions of Stable Adducts of TRIS (Pentafluorophenyl) Antimony (V) Diisothiocyanates.
A series of new stable adducts of tris (pentafluo-rophenyl)antimony(V) diisothiocyante of the type (C6H5)3 Sb(NCS)2.L. Where, L = dipropyl formamide (DPF), 3-methylpyridine(3-Picoline), dimethyl formamide (DMF), tryphenylphosphine oxide(Ph3PO), triphenylarsine oxide (Ph3AsO), dimethyl sulfoxide (DMSO), thiourea (TU), pyridine(C5H5N) have been synthesized by the reaction of tris (pentafluorophenyl)antimony(V) diisothiocyanate with desired ligand in anhydrous methanol. Tris(pentafluorophenyl) antimony diisothiocyanate was obtained by the metathetical reaction of tris(pentafluorophenyl) antimony (V) dichloride and potassium thiocyanate in anhydrous methanol. The molecular weight measurement and molar conductance data of the complexes revealed them to be monomeric and non-conducting in nature. Elemental analysis and IR data indicates that the complexes have hexacoordinated octahedral structure.
