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The oxoplatinates Na2PtO2, Na2PtO3, ?K2PtO3”? and ?Rb2PtO3”?. Hitherto unknown Na2PtO2 (greyish black) was prepared. Na2PtO2 (orthorhombic, D—Immm; a = 4.585, b = 3.119, c = 9.588 Å) is isotypic with Li2CuO2. α-Na2PtO3 (darkyellow; red as single-crystals) is monoclinic, C—C2/c (a = 5.419, b = 9.385, c = 10.752 Å, β = 99.67°), Li2SnO3-type. According to 3-dimensional single crystal data hitherto unknown β-Na2PtO3 (red crystals) is an orthorhombic variant of the Li2SnO3-type (a = 18.838, b = 6.282, c = 9.062 Å, Z = 16, D—Fddd; parameters see text); R = 0.0809, R' = 0.0948 [256 reflexes (hk0—hk6)]. The Madelung part of the lattice energy (MAPLE) is calculated and discussed for α-, β-Na2PtO3, α- and β-PtO2. For the first time we got K2PtO3 and Rb2PtO3. 相似文献
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The Crystal Structure of Thallium Dichloride, TlCl2 Thallium dichloride, TlCl2, crystallizes tetragonal in the I41/a space group with cell constants a = 696.45(8) pm and c = 1 552.8(3) pm. The structure is of the CaWO4 type so that the compound must be formulated as thallium(I)-tetrachlorothallate(III). 相似文献
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Mordechai L. Kremer 《国际化学动力学杂志》1985,17(12):1299-1314
Kinetic and spectrophotometric measurements made during the Fe3+ ion catalyzed decomposition of H2O2 have been analyzed using the computer simulation method. Improved values of the rate constants of the “complex scheme” and of the molar absorptivities ofthe intermediates were obtained: k3/KM = 4.94 M?1 min?1, k4 = 193 M?1 min?1, εI/KM = 52.3 M?2 cm?1, εII = 25.7 M?1 cm?1. The simulation revealed details of the reaction which were unavailable by other means and which explained several features of its kinetics. The total amount of O2 evolved in the reaction using [H2O2] ~ 10?2 M has been calculated and found to be nearly stoichiometric. O2 evolution experiments in this region cannot, thus, distinguish between the “complex mechanism” predicting nearly stoichiometric evolution of O2 and the “free radical mechanism” predicting exactly stoichiometricamounts of O2. There are discrepancies within the “free radical scheme” with regard to the correct values of the rate constants to fit the reactions of H2O2 both with Fe2+ and Fe3+ ions, as well as other reactions assumed to proceed via free radicals. 相似文献
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Helmut Keck Wilhelm Kuchen Heike Renneberg Johan K. Terlouw Herman C. Visser 《无机化学与普通化学杂志》1990,580(1):181-187
Gaseous “H3PS2” – Generation and Characterization Double alkene elimination from molecular ions (El: 70 eV) of dialkyldithiophosphinic acids R2P(S)SH (R: Et, nPr, nBu) leads to radical cations of composition [H3PS2]+. (m/z 98). By analysis of the collisional activation (CA) mass spectrum and using thermochemical data it was shown that [H3PS2]+. exists as a mixture of structures [H? P(SH)2]+. and [HSP? SH2]+. containing tri- or dicoordinated phosphorus, respectively. No structure corresponding to ionized dithiophosphinic acid H2P(S)SH was observed. Via neutralization reionization mass spectrometry (NRMS) neutral molecules ?H3PS2”? were obtained which proved to be stable in the dilute gas phase and most probably are of structure H? P(SH)2. Experimental findings are in accordance with the results of semiempirical MO-calculations (MNDO). 相似文献
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