14023-10-0Relevant academic research and scientific papers
Thermodynamic properties of trans-tetrachlorodi-μ-carboxylate dirhenium(iii) complexes
Iziumskyi, Maksym,Baskevich, Alexander,Melnyk, Stanislav,Shtemenko, Alexander
, p. 10012 - 10015 (2016/12/07)
In order to obtain unknown thermodynamic properties, such as enthalpy of formation, of trans-tetrachlorodi-μ-carboxylate dirhenium(iii) (trans-[Re2Cl4(RCOO)2] (R = C2H5; C3H7; (CH3)2CH; (CH3)3C)) exothermic reactions of burning in oxygen were investigated. The products of burning were studied by chemical analysis. The experimental enthalpy changes of the burning reactions of the complexes were obtained from DTA curves. The standard enthalpies of formation for trans-[Re2Cl4(RCOO)2] (R = C2H5; C3H7; (CH3)2CH; (CH3)3C) were found to be 36966, 63531, 48701 and 66350 kJ mol1 according to the second law of thermochemistry (Hesss law). The enthalpies of formation for the trans-carboxylates of dirhenium(iii) were calculated by a semiempirical method. A series of thermal stabilities for trans-tetrachlorodi-μ-carboxylate dirhenium(iii) complexes was built by considering their thermodynamic properties.
Metal carbonyl syntheses XXII. Low-pressure carbonylation of - and -. The technetium(I) and rhenium(I) complexes 2
Alberto, Roger,Schibli, Roger,Egli, Andre,Schubiger, P. August,Herrmann, Wolfgang A.,et al.
, p. 217 - 224 (2007/10/02)
Low pressure carbonylation (1 atm) of - or - in the presence of BH3/THF and halides X- results in the clean formation of 2 containing monovalent rhenium or technetium (M = Re, Tc, X = Cl, Br).In the case of the radioactive element technetium this low pressure synthesis is an important progress since the potential hazards of traditional high-pressure carbonylations are thus avoided.The complex 2 crystallizes in the space group P-1 with a = 10.166(2), b = 16.393(4), c = 17.243(5) Angstroem, and α = 69.27(2), β = 86.42(2), γ = 88.61(2) deg, Z = 4, and V = 2682(1) Angstroem3. 2 is a versatile precursor compound of other Re(I) and Tc(I) complexes: substitution of the halide ligands by a variety of ?-donor ligands is facile even under mild conditions.Examples include reactions with CN-tBu to yield quantitatively TcCl(CN-tBu)2(CO)3 and with a tetradentate phosphine ligand to yield the dinuclear complex .The X-ray structures of both compounds were determined.Dissolution of 2 in water under aerobic conditions results in the unusual organometallic aqua cation +, which species is stable in water for days (IR spectroscopy).Keywords: Rhenium; Technetium; Low-pressure Carbonylation; Metal Carbonyls; Structure
Metal carbonyl syntheses. XXII. Low pressure carbonylation of - and -: the technetium(I) and rhenium(I) complexes 2
Alberto, Roger,Schibli, Roger,Egli, Andre,Schubiger, P. August,Herrmann, Wolfgang A.,et al.
, p. 119 - 128 (2007/10/02)
Low pressure carbonylation (1 atm) of - or - in the presence of BH3-tetrahydrofuran and halides X- results in the clean formation of 2 containing monovalent rhenium or technetium (M = Re or Tc; X = Cl or Br).In the case of the radioactive element technetium this low pressure synthesis is an important progress since potential hazards of traditional high pressure carbonylations are thus avoided.The complex 2 crystallizes in the space group P with a = 10.166(2), b = 16.393(4), c = 17.243(5) Angstroem, and α = 69.27(2), β = 86.42(2), γ = 88.61(2) deg, Z = 4 and V = 2682(1) Angstroem3. 2 is a versatile precursor compound of other Re(I) and Tc(I) complexes; substitution of the halide ligands by a variety of ?-donor ligands is facile even under mild conditions.Examples include reactions with CN-tBu to yield quantitatively TcCl(CN-tBu)2(CO)3 and with a tetradentate phosphine ligand to yield the dinuclear complex .The x-ray structures of both compounds were determined.Dissolution of 2 in water under aerobic conditions results in the unusual organometallic aqua cation +; this species is stable in water for days (IR spectroscopy). Keywords: Rhenium; Technetium; Low-pressure carbonylation; Metal carbonyls; X-ray structure
