The reaction of thiosaccharin (tsacH) with the triosmium cluster [Os3(CO)10(NCMe)2] furnishes the decacarbonyl isomers [HOs3(CO)10(μ-S-tsac)] (1) and [HOs3(CO)10(μ-N,S-1,3-tsac)] (2) in a 3:1 ratio at room temperature. These isomers differ by the coordination mode displayed by tsac ligand. The...
The development of transition metal cluster chemistry is traced from the early discoveries of metal-metal bonded systems through to some recent developments made in the area of high nuclearity osmium and rutherium cluster carbonyls. Emphasis is placed on developments made in the physical techniq...
The reactivity of some ruthenium and osmium carbonyl clusters towards unsaturated organic ligands is described.
Treatment of [Os3(CO)10(NCMe)2] with an equimolar amount of 4-vinylpyridine, 4-ethynylpyridine and 4-ethylpyridine at room temperature readily gave the cluster complexes [Os3(μ-H)(CO)10(μ-NC5H3CH = CH2)] 1, [Os3(μ-H)(CO)10(μ-NC5H3C≡CH)] 2 and [Os3(CO)10(μ-H)(μ-NC5H3CH2CH3)] 3, respectivel...
Formation of the linear chain ruthenium and osmium carbonyls by successive linkage of mononuclear [M(CO)4Cl2] units and by opening trinuclear clusters [M3(CO)12] and [FeM2(CO)12] (M = Ru, Os) with chlorine gas have been studied by computational DFT methods. Energetically the formation of dinucle...
The higher nuclearity raft-like cluster Os6(CO)20(μ-SbPh2)2, 5-Os, was isolated from the base hydrolysis of Os3(CO)11(SbPh2Cl), 1-Os. The ruthenium analogue, viz., Ru6(CO)20(μ-SbPh2)2, 5-Ru, was obtained from the reduction of Ru3(CO)12, 7-Ru, with the benzophenone ketyl radical followed by tre...
A new osmium(II) carbonyl complex, [Os(H)(CO)(PPh3)2(L)] (1) with thioether containg NNS donor ligand (where L = 2-(ethylthio)-N-((pyridine-2-yl)methylene))benzenamine) is synthesized and characterized by various spectroscopic techniques. The distorted octahedral environment around osmium in the...
Seven new complexes comprising of diosmium(I) tetracarbonyl sawhorse units bound to dicarboxylate anions (DCAs) have been synthesized using microwave heating. Succinic, adipic, pimelic, suberic, tetradecanedioic, and terephthalic acids react with Os3(CO)12 at temperatures ranging from 180 to 205...
Thin-film electrodes of manganese oxide were synthesized via the thermal decomposition of various ink complexes consisting of manganese (II), formate (Mnf), triethylenetetramine (TETA), and hexanol. Inks complexed with various molar ratios of TETA to Mnf were calcined at 260 °C for 30 min under...
A vibrational spectroscopic study of nickel (II) formate and its aqueous solution has been made. The vibrations characteristic of a formato—nickel complex have been assigned and it is concluded that the species Ni(HCO2)+(HCO2)− exists in the solid state, with monodentate ligand-to-metal bonding...
Two (μ-formato)nickel(II) complexes [Ni2(HCOO)(bz)8(H2O)2](HCOO)3·4H2O (1) and [Ni(tren)(HCOO)]ClO4·H2O (2) were synthesized and characterized by spectroscopic methods. The structure of complexes has been determined by X-ray crystallography. The formato ligand bridges the Ni(II) central atoms...
The catalytic synthesis of methyl acrylate by hydroesterification of acetylene with methyl formate was studied under various conditions. Mixtures of nickel acetate tetrahydrate, copper sulfate pentahydrate and sodium iodide dihydrate were used as catalysts, and N,N-dimethylformamide as solvent. ...
Two sets of bands corresponding to each of the wagging, twisting and rocking modes of water and the planar ν3 mode of the formate ion are deduced from the IR (at room and low temperatures) and Raman (at room temperature) spectra in the region 1000-400 cm−1 of powdered samples of dihydrate (dide...
In this work a novel bioprocess for hydrogenation of CO2 to formate was developed, using whole cell catalysis by a sulfate-reducing bacterium. Three Desulfovibrio species were tested (D. vulgaris Hildenborough, D. alaskensis G20, and D. desulfuricans ATCC 27774), of which D. desulfuricans showed...
A nickel film with electrical conductivity was successfully synthesized via thermal decomposition. A complex consisting of nickel formate ink and triethylenetetramine was coated onto a glass substrate, which was then calcined under a nitrogen atmosphere. The ink complex then became electrically ...
Non-isothermal decompositions (including TG, DTG, DTA and DSC) of nickel malonate dihydrate and of nickel hydrogen malonate dihydrate were studied in different dynamic atmospheres of N2, H2 or air. The reaction of the hydrogen malonate salt commences at a lower temperature than the corresponding...
Structure and thermolysis of NiC2O4·2H2O (I) and Ni(HCO2)2·2H2O (II) were studied for the precipitated powders from the water solutions of precursors. The compound (I) has a disordered structure (C2/c, a=11.7916(5), b= 5.31798(14), c= 9.7806(7) Å, β = 127.014(6)°, V= 489.73(4)Å3) which is de...
A conductivity method was utilized to study the kinetics of the successive replacement of chloride ligands by ammonia in methanol solvent for the three complexes. For t-Pt(P(C2H5)3)2Cl2 there was an induction period and complete description of the kinetics was not achieved. The second ammonation...
Photolyses of the cis and trans square planar complexes of dichlorobis(triethylphosphine)platinum(II) in methanol have been studied using incident light at 254, 313 and 365 nm. The quantum yield of trans to cis conversion (ΦT→C) is unity for degassed solutions and 0.13 in the presence of oxyge...
This study was designed to the elucidate sensitising effects of the intracellular histamine antagonist, N,N-diethyl-2-[4-(phenylmethyl)phenoxy] ethanamine· HCl (DPPE) on the antitumour activity of cis-diamminedichloroplatinum (II) (CDDP) using human ovarian cancer cell lines with different sens...
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