Moduli of abelian varieties and Dieudonné modules of finite by Aise Johan de Jong

By Aise Johan de Jong

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H g . CBr 3 -> C 6 H 5 . CF2-CF2-*CF2 ecu tungsten/carbon CF 3 I Pt ► cci 2 ► CF2 1100°C hv, 14°K N C N 3 + C1 2 AT or N2 matrix ► CC1 2 Properties. The emission spectrum of difluorocarbene in the region 2400-3250 Ä was observed by Venkateswarlu who suggested that it indicated that difluorocarbene was a non-linear molecule. Subsequent work confirmed that the vibrational frequencies found were consistent with a bent molecule. This suggests that difluorocarbene is in the singlet state (whereas CH 2 is a triplet).

1 and 2, Macmillan, New York (1964). E. K. Storms, The Refractory Carbides, Academic Press, New York (1967). 167 G. physik. Chem. (Leipzig), 11B (1931) 433. 1211 INTERSTITIAL CARBIDES the structure corresponds to the sodium chloride lattice with the metal atoms occupying the chloride ion positions and the carbon atoms the sodium ion positions. Filling of only half the octahedral holes leads to structures of the type M 2 C The metals Cr, Mn, Fe, Co and Ni all have atomic radii <0·13 nm and the distortion of the lattice arising from the accommodation of carbon atoms leads to greater reactivity.

207 E . Ott, Ber. 58 (1925) 772. 208 w . J. Lafferty, A . G . M a k i a n d E . K . Plyler, / . Chem. Phys. 40 (1964) 224. 209 D . A . L o n g , F . S. Murfin a n d R . L . Williams, Proc. Roy. Soc. {London), A223 (1954) 2 5 1 . 210 L. B . Dashkevich, Russ. Chem. Rev. 35 (1967) 3 9 1 . ni have studied the photolysis of carbon suboxide in ethylene. Products were allene, methyl acetylene and carbon monoxide. The suggested mechanism of photolysis is: This mechanism was also proposed for thermal decomposition of carbon suboxide, the species C2O decomposing further to carbon monoxide and solid carbon.

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