共查询到20条相似文献，搜索用时 15 毫秒
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G. Schöber 《Fresenius' Journal of Analytical Chemistry》1964,206(2):120-121
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P. T. Cleve und O. M. Höglund 《Fresenius' Journal of Analytical Chemistry》1874,13(1):111-112
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Oxidefluorides of Niobium and Tantalum The reaction of NbF5 with SiO2 (silica glass ampules) at 310°C or with SiO2 (Aerosil) at 180°C always leads to NbO2F. To the contrary the reaction with laboratory glass (Jenaer Geräteglas) at 130°C leads to NbOF3. TaF5 reacts in silica glass ampules at 400°C by formation of TaO2F, however at 300°C or 260°C by formation of TaOF3. Silica glass did not react with NbF5 at 130°C, however Nb2O5 and NbF5 gave at 130°C in silica glass ampoules NbOF3. Similarly, TaF5 and Ta2O5 or TaO2F formed at 260°C in nickel ampoules TaOF3. The chemical and the thermochemical behaviour of oxidefluorides have been investigated. The compounds NbOF3 and TaOF3 are isomorphic. Lattice constants are mentioned. 相似文献
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The electronic structure of phosphols and arsols has been investigated using an extended CNDO/2 approach. Conformational problems, orbital energies and sequence, orbital density and total density plots and substituent effects are considered. In all cases comparison is made between arsols, phosphols and pyrrols. 相似文献
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Clemens Winkler 《Fresenius' Journal of Analytical Chemistry》1895,34(1):258-262
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Ed. Donath und A. Lang 《Fresenius' Journal of Analytical Chemistry》1915,54(9):480-483
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Dimethyltin Dithiosquarate: The Crystal Structure of the Benzene Solvate and of the Dimethylsulfoxide Adduct (CH3)2SnS2C4O2 · 1/3 C6H6 ( I ) crystallizes in the orthorhombic space group Pnma. a = 14.393(2), b = 21.668(3), c = 10.424(1) Å, Z = 12. (CH3)2SnS2C4O2 · (CH3)2SO ( II ) is monoclinic, space group P21/n, a = 9.918(5), b = 12.028(6), c = 12.223(6) Å, β = 108.82(3)°, Z = 4. In I there are two independent dimethyltin dithiosquarate molecules. But in both molecules the Sn atoms display weak coordinative bonds to two O atoms of adjacent dithiosquarate groups. The distances amount 2.873 Å (2×), resp. 2.678 and 2.831 Å. The coordination number of tin becomes 6 and the structure gets connected in three dimensions. In II dimethylsulfoxide is bound with the O atom to Sn (2.345 Å) and the result is a distorted trigonal bipyramid. There a more distant O atom (2.944 Å) leads to a connection of the molecules to a ribbon. The changes of the geometrical parameters are described, which result from the progressive approach of the one O atom. 相似文献
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H. Braun K. Bohland E. Pflüger K. Bodland und W. Camerer 《Fresenius' Journal of Analytical Chemistry》1885,24(1):297-300
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