Raj K. Poddar

Complexes of ruthenium(III) and -(II) with dimethylsulphoxide—II. [RuBr3(Me2SO)3] and [RuBr2(Me2SO)3]: Versatile starting materials for the syntheses of ruthenium bromo complexes

Abstract The ruthenium(III) and -(II) complexes [RuBr3(Me2SO)3] and [RuBr2(Me2SO)3] have been synthesized and characterized using physical methods. [RuBr3(Me2SO)3] is the first example of a ruthenium complex where all three Me2SO molecules are O-bonded whereas RuBr2(Me2SO)3 has all Me2SO molecules S-bonded. Reactions of RuBr3(Me2SO)3 with various monodentate and bidentate ligands containing S, P, As, N and O-donor atoms have been carried out leading to partial or complete substitution of the Me2SO molecules.

Complexes of Ruthenium(III) with dimethylsulphoxide—I. [Ru2Cl6(DMSO)4], fac and mer isomers of [RuCl3(DMSO)3]: Versatile starting materials for the synthesis of ruthenium(III) complexes

Abstract Ruthenium(III) complexes with dimethylsulphoxide (DMSO), [RuCl 3 (DMSO) 2 ] 2 and [RuCl 3 (DMSO) 3 ] were synthesized and characterized by physical methods. The fac and mer isomers of [RuCl 3 (DMSO) 3 ], were obtained. The fac isomer has all S-bonded DMSO whereas mer has both S- and O-bonded DMSO molecules. The above three compounds were reacted with S, P, As, N and O donor ligands leading to partial or complete substitution of DMSO molecules, depending on the reaction conditions and nature of the incoming ligand. S, P and As donor ligands gave complete substitution of DMSO molecules, whereas N and O donor ligands generally gave partial substitution. New compounds prepared and characterized are [RuCl 3 L 2 (DMSO)] (where L = py, CH 3 CN; L 2 = 1,10-phenanthroline, 2,2′-bipyridyl) and [Ru(acac)(DMSO) 2 Cl 2 ].

A convenient method of preparing nickel (II) thiocyanate and its use in synthesis

SummaryA convenient method for preparing nickel(II) thiocyanate is described. Some new compounds containing nickel thiocyanate and ligands, such as OPPh3, OAsPh3, bipy, Me2NH, Et3N or N2H4 are reported, together with their structures and the nature of the bond between the thiocyanate and the metal, which has been determined by physical and chemical methods.

Novel synthesis of [Ru(phen)2Br2]X (X=Br, ClO4 or BPh4) and convenient synthesis of bis(2,2′-bipyridine) complexes of ruthenium(III) and tris(2,2′-bipyridine) or (1,10-phenanthroline) complexes of ruthenium(II)

Abstract Synthesis of the new ruthenium complexes [Ru(phen)2Br2]X (X=Br, ClO4 or BPh4) and convenient synthesis of [Ru(bipy)2Cl2]X, (X=Cl or ClO4) are reported using [RuBr3(Me2SO)3] and fac- and mer-[RuCl3(Me2SO)3]. Syntheses of ruthenium(II) complexes [Ru(bipy)3]X2 (X=Cl, Br, ClO4 or BPh4) and [Ru(phen)3]X2, (X=ClO4 or BPh4) are reported using [RuBr3(Me2SO)3], fac- and mer-[RuCl3(Me2SO)3], [RuBr2(Me2SO)3] and (RuCl2(Me2SO)4]. The compounds are characterised using various physical methods.

Ruthenium(II) complexes with triphenylphosphine or triphenylarsine and other monodentate ligands

Abstract Synthesis and studies on some five-coordinate ruthenium(II) complexes, viz. [Ru(MPh3)(C6H5CHO)2Cl2] and [Ru(MPh3)2(CO)Cl2] (where M = P or As) have been described. Reactions of [Ru(MPh3)(C6H5CHO)2Cl2] with N,N-dimethylformamide, dimethylsulphoxide and pyridine and of [Ru(MPh3)2(CO)Cl2] with pyridine are described.

Ruthenium(II) and palladium(II) complexes with 2,6-(bispyrazol-1-yl)pyridines

Ruthenium(II) and palladium(II) complexes [Ru(DMSO)(L)Cl2] and [Pd(L)Cl]Cl, where L = 2,6-bis(pyrazol-1-yl)pyridine (bpp) or 2,6-bis(3,5-dimethylpyrazol-1-yl)pyridine (bdmpp) have been synthesized. All complexes were characterized by elemental analysis, IR, 1H NMR, UV-Vis, and cyclic voltammetry measurements.

Synthesis of some novel penta-coordinated complexes of ruthenium(II) containing aromatic aldehyde and other monodentate ligands and catalytic oxidation of triphenylphosphine using some of them

Abstract The synthesis and characterization of some penta-coordinated ruthenium(II) complexes, viz. [RuX2(MPh3)(C4H3OCHO)2] (X  Cl or Br; M  P or As), [RuBr2 (MPh3)(C6H5CHO)2] (M  P or As) and [RuBr2(CO)(PPh3)2], are described. The compounds were characterized using analytical data and various physical methods. [RuBr2(PPh3)L2] (L  C4H3OCHO or C6H5CHO) complexes catalysed the oxidation of PPh3 by molecular oxygen.

Reactivity and catalytic activity of [RuBr2(Me2SO)3]

Abstract [RuBr 2 (Me 2 SO) 3 ] has been used as precursor for the synthesis of many ruthenium(II) complexes containing bromide ion and other ligands. The complexes, thus synthesised are: [RuBr 2 L 4 ] (L=PPh 3 , L 2 =phen or bpy); [RuBr 2 (Me 2 SO) 2 L 2 ] (L=py, AsPh 3 ; L 2 =phen, bpy or o -phenylenediamine); [RuBr 2 (CS)(PPh 3 ) 3 ]; [RuBr 2 (CS)(Me 2 SO) 2 ]; [RuBr 2 (CS)(AsPh 3 ) 2 (Me 2 SO)] and [RuBr(C 2 O 4 H)- (Me 2 SO) 2 ]. These compounds have been characterised with the help of analytical data and various physical methods. [RuBr 2 (Me 2 SO) 3 ] has been used as a catalyst for the oxidation of PPh 3 by molecular oxygen.

Synthesis, characterization and reactivity studies of dichloroacetylacetonato acetylacetone ruthenium(III)

SummaryThe RuIII complex [RuCl2(acac)(acacH)] (acacH = acetylacetone) was isolated in high yield by reacting RuCl3 with acacH. The compound was used as a convenient starting material for the synthesis of a variety of RuIII complexes, viz. [RuCl2(acac)L2] (L = PPh3, AsPh3, py, MeCN, Me2SO, o-phenylenediamine; L2 = phen or bipy) and M2[RuCl4(acac)] (M = Me4N, Rb or Cs). The compounds were characterized by physicochemical and spectroscopic methods.

Synthesis, characterization and comparative studies of mono- and dimeric copper(II) complexes containing tripodal ligands

Mono and dimeric bromo-bridged copper(II) complexes of the type [CuBr2(L)] and [Cu2Br2(L)2](ClO4)2 containing nitrogen donor tripodal ligands L = 2,6-bis(pyrazol-1-yl)pyridine (bppy) or 2,6-bis(3,5-dimethylpyrazol-1-yl)pyridine (dmbppy) have been synthesized. All complexes have been characterized by elemental analysis, IR, ESR and electronic spectra and magnetic susceptibility and cyclic voltammetry measurements.