Mononuclear Coordination Compounds Research Articles

(Tnmethylphosphine)(triphenylsilyl)gold(I) and Related Compounds

Mononuclear coordination compounds of the type (R3P)AuSiR′3 with R = R’ = Ph and R = Me, R′ = Ph have been obtained from reactions of the corresponding halide complexes (R3P)AuCl with the silyllithium reagent LiSiPh3. The fully phenylated species undergoes ligand redistribution in solution to give homoleptic ionic species. (Me3P)AuSiPh3 is less susceptible to this process and crystallizes from solutions as the heteroleptic complex. The crystal structure of this compound has been determined by X-ray diffraction. In the crystal lattice the molecules are not associated.

Trivalent mononuclear mer-trichlorotris (pyridine) tantalum (III): preparation and structure in three crystalline forms

A convenient method of preparation of scarcely known mononuclear coordination compounds of trivalent tantalum was achieved by reduction of TaCl5 with KC8 in the presence of pyridine. Three crystalline forms of mer-trichlorotris(pyridine) tantalum (III) have been prepared and characterized. TaCl3(py)3 (1) crystallizes in the monoclinic space group P21n, with a = 9.242(1), b = 12.596(2), c = 15.689(5) A, β=91.70(2)°, V=1825.6(7) A3, Z=4. The pyridine solvate TaCl3(py)3·py (1·py) has an orthorhombic cell with space group C2221, a=8.7914(7), b=17.042(1), c=14.474(3) A, V=2168.6(4) A3, Z=4. The pyridine and toluene solvate, TaCl3(py)3·py·(C7H8) (1·py·tol) also crystallizes in space group P21n, with a=8.624(5), b=18.750(4), c=14.916(5) A, β=93.96(2)°, V=2406(2) A3, Z=4. The three pyridine and three chloride ligands coordinate to the tantalum (111) center with a meridional octahedral configuration.

Syntheses and Structures of Three Mononuclear Coordination Compounds Containing Six- and Seven-Coordinated Manganese(II) Ions

The reactions of Mn(CF3COO)2 (1) with Ν,Ν,N′,N′-tetramethylethylenediamine (tmen), 2,2′-bipyridine (bipy) and triethanolamine (tea) yield three new mononuclear coordination compounds: trans-[Mn(tmen)2(CF3COO)2] (2), cis-[Mn(bipy)2(CF3COO)2] (3), and [Mn(tea)2](CF3COO)2 (4). The X-ray structures of the compounds 2, 3, and 4 are described. The seven-coordination of the manganese(II) ion in 4, as well as the inequivalency of the two tea molecules coordinated to Mn(II) make this compound unique.

Non-isothermal decomposition kinetics of a mononuclear coordination compound of Fe(II)

Non-isothermal decomposition kinetics of a mononuclear coordination compound of Fe(II)

On the thermal stability of some coordination compounds generating mixed oxides with perovskitic structure II

Abstract Following our research concerning the thermal stability of coordination compounds generating mixed oxides [1], this paper deals with the non-isothermal kinetics of solid-state decompositions of some mononuclear coordination compounds (MCC) of La and Co, and a polynuclear coordination compound (PCC) of the pair La-Co with salicylic acid. The paper is part of a research series looking to obtain some mixed oxides with general formula ABO 3 , specific to perovskitic structure, where A is a rare earth ion, and B is a transition metal ion, by thermal decomposition of some polynuclear coordination compounds. The importance of mixed oxides of La with perovskitic structure [2–4] is due to their catalytic properties for oxidation-reduction reactions [5], dehydrogenation [6] and depollution processes, which are similar to those exhibited by platinum catalysts.

On the thermal stability of some coordination compounds generating mixed oxides with perovskitic structure

Following our research concerning the thermal stability of coordination compounds generating mixed oxides [1], this paper deals with the non-isothermal kinetics of solid-state decompositions of some mononuclear coordination compounds (MCC) of La and Co, and a polynuclear coordination compound (PCC) of the pair La-Co with salicylic acid. The paper is part of a research series looking to obtain some mixed oxides with general formula ABO 3, specific to perovskitic structure, where A is a rare earth ion, and B is a transition metal ion, by thermal decomposition of some polynuclear coordination compounds. The importance of mixed oxides of La with perovskitic structure [2–4] is due to their catalytic properties for oxidation-reduction reactions [5], dehydrogenation [6] and depollution processes, which are similar to those exhibited by platinum catalysts.

Halogenonitrosylmolybdates—Simple, Monomeric MoII Complexes

The first mononuclear coordination compounds of MoII with simple ligands have the formulas (1) to (4). The diamagnetic complexes, which are stable at room temperature, can be used for the synthesis of further MoII compounds. equation image