83 research outputs found

    Crystal Structure and Infrared Spectra of Anhydrous (Adeninato)methylmercury(II)

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    The title compound, C6H7HgN5, belongs to the orthorhombic space group Pbcn, a == 14.658(8), b == 8.407(5), c == 13.006(9) A, Deal = 2.898 g cm-3, Z == 8 molecules per cell. The structure was refinedon 1132 unique nonzero reflections to R == 0.026. The crystal containsthe same type of 1 : 1 monomeric molecule as the monohydrat in which the CH3Hg group is bonded to the N(9) position of deprotonated adenine. These molecules are associated into infinite ribbons by means of two pairs of complementary N-H ... N bonds involvingboth amino protons and the lone pairs on N(l) and N(7) of each molecule. The infrared spectra of this material and of the monohydrate differ almost exclusively in the regions related to NH2 vibrations. This simply results from differences in hydrogen- bonding patterns and no direct metal-amino interaction is taking place in any case. The spectral changes already identified as characteristicof N(9)-complexation for the monohydrate are also observed for the anhydrous compou nd

    Le syndicalisme chez les cordonniers de Québec: 1900-1930

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    Québec Université Laval, Bibliothèque 201
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