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101.
Konstantin Karaghiosoff Thomas M. Klaptke Alexej Michailovski Gerhard Holl 《Acta Crystallographica. Section C, Structural Chemistry》2002,58(9):o580-o581
The title compound (systematic name: 4,10‐dinitro‐2,6,8,12‐tetraoxa‐4,10‐diazatetracyclo[5.5.0.03,11.05,9]dodecane), C6H6N4O8, exhibits the highest density among known N‐nitramines, due to its close‐packed crystal structure. It may be regarded as consisting of a distorted hexagonal close‐packed lattice formed by the isowurtzitane cages, with the nitro groups occupying the free space between the cages. 相似文献
102.
A. M. Meeks J. M. Giaquinto J. M. Keller 《Journal of Radioanalytical and Nuclear Chemistry》1998,233(1-2):131-136
Germanium spectrometers must be operated at liquid nitrogen temperatures. Other detectors operate better when cooled. Many
applications, because of hostile environments, inaccessibility, remote location, long duration, etc., are compromised, or
totally precluded, by the requirement for liquid nitrogen. A Stirling cycle refrigerator based on a linear motor design, which
is acoustically and vibrationally quiet, does not require secondary cooling, and operates unattended for years, is under development.
System design and specifications are presented. Applications to cooled laser monitoring equipment. SQUID-based detection systems,
environmental cleanup and monitoring, medical diagnostics, non-destructive testing systems, communication equipment, computer
electronics, and imaging systems are discussed. 相似文献
103.
G. H. Guthöhrlein H. P. Keller 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1990,17(3):181-193
Performing Doppler-free laserspectroscopic investigations in the red wavelength region (640–670 nm) we were able to determine 10A-factors and 9B-factors of atomic cobalt levels. Now precise values of 18A-factors and 16B-factors of levels belonging to the configurations (3d+4s)9 are known. Fitting of the one-electron radial parameters to introduce agreement between experimental and theoretical hfs constants allows the prediction of hfs constants of not yet investigated fine structure levels. Values of the electric quadrupole moment of the Co59 nucleus are determined in two electron configurations. The resulting mean value of the spectroscopic quadrupole moment isQ=0.35(3) barn. 相似文献
104.
Gerhard Buchbauer Waltraud Pernold Dorothea Rassl Brigitte Blach 《Monatshefte für Chemie / Chemical Monthly》1981,112(4):517-527
The synthesis of some new potentially, nitrogenefree spasmolytics is described. Formally the benzene nucleus in some mandelic acid esters, known by their mild spasmolytic activity, is substituted for the isocamphane bicyclus by a) SeO2 oxidation of 1-(3,3-Dimethyl-2-exo-norbornyl)-ethanone (5) to the corresponding ketoaldehyde6, b) oxidation of6 to the isocamphane analogous mandelic acid4 and c) esterification of derivatives of4 with isoamylalcohol and benzylalcohol. Attemps to dehydrate the methylester7 to camphenylideneacetic acid methylester (12) by various methods failed, probably because of the ring strain.
Teil der Diplomarbeit vonB. Blach, Universität Wien 1981. 相似文献
105.
106.
Timothy B. Hutson Ming J. W. Chang Joseph T. Keller David J. Long 《Mikrochimica acta》1988,94(1-6):339-341
Fourier transform infrared techniques were used to monitor mammalian cell growth plated on attenuated total reflection (ATR) crystals. Consistently, the growth kinetics plots generated from the obtained spectra demonstrated a sigmoidal curve representing a sequence of slow, rapid, then tapering cell growth which correlated well with non-spectral cell growth determinations. Significant advantages over traditional methods of measuring cell growth kinetics are demonstrated. The technique has promising potential to be used to study events in areas such as toxicology and cell biology. 相似文献
107.
Reactions of the extremely labile molybdenocene olefin complexe Mo(η5-C5H5)2[(Z)-C6H5CH=CHC6H5] with heteroallenes X=C=Y (X=C=Y = CS2, (p-tolyl)NCN(p-tolyl), (C6H5)2CCO) gives the corresponding heteroallene complexes of molybdenocene Mo(η5-C5H5)2(X=C=Y) in high yields. Spectroscopic data clearly indicate a dihapto-coordination of the heteroallenes via the C=X bond (X = O, S, N). 相似文献
108.
Trigonal Planar CuX3-Groups in Cu2Mo6X14, X = Cl, Br, I Cu2Mo6Cl14 (I), Cu2Mo6Br14 (II) and Cu2Mo6I14 (III) were synthesized by thermal treatment of corresponding mixtures of copper(I) and molybdenum(II) halides. The crystal structures were determined by single crystal X-ray analyses. I and II show isotypism, cubic, Pn3 (no. 201, sec. setting), Z = 4, I: a = 12.772(3) Å, II: a = 13.350(2) Å. III shows a new structural type, orthorhombic, Pbca (No. 61), Z = 4, a = 16.058(3) Å, b = 10.643(2) Å, c = 16.963(3) Å. Trigonal planar CuX3 units were found in I? III. Structural behaviour relations are discussed, especially with regard to ionic conductivity. 相似文献
109.
Reaction of (η-C5H4CH3)2TiCl2 with CH3OCH2MgCl yielded (η-C5H4-CH3)2Ti(Cl)CH2OCH3 (2a). Complex 2a crystallizes in space group P21/n with cell constants a 8.162(1), b 11.004(2), c 15.297(2) Å, β 96.40(1)°. In contrast to the three-membered metallacyclic zirconium compound of analogous composition (η-C5H5)2Zr(Cl)CH2OCH3 (1), the titanocenyl-substituted ether 2a has an open-chain (η1-O“-outside”) type structure. 相似文献
110.
The sorption of solvent vapours onto dried cellulose has been investigated. The time-dependence and the effect of the solvent-water ratio is discussed. The studies concerned the properties of methanol, ethanol, propanol and butanol. 相似文献