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  • Articles  (2)
  • 1995-1999  (1)
  • 1990-1994  (1)
  • 1
    ISSN: 0749-1581
    Keywords: Multinuclear NMR; ; Platinum-Amine complexes ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction of the platinum complex K[PtCl3(NH3)] with NH3 or NH2(CH2)nNH2 in the presence of I- gives the mixed chloroiodoamine complexes cis-[PtCl3(NH3)2] and [{cis-Pt(Cl)3(I)(NH3)2}2μNH2(CH2)nNH2], respectively. These findings prompted an examination of the nature of the reaction of K[PtCl3(NH3)] with I- in detail. Rapid displacement of two chlorides to give the trans-[Pt(I)2Cl(NH3)]- anion is observed with a subsequent slow displacement of the third chloride to give the [PtI3(NH3)]- anion. Concomitant with the formation of the triiodo anion, dimerization occurs, giving the iodo-bridged compound [PtI2(NH3)]2. Correlation of δ(195Pt) and δ(15N) chemical shifts and 1J(195Pt,15N) coupling constants was made with literature values, allowing a complete set of data for the series [PtXn(NH3)4 - n](2 - n)+ with systematic variation of X (Cl,I) to be presented.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The 8-amino-7-oxopelargonate synthase (AOPS) cloned from Bacillus sphaericus, overproduced in Escherichia coli, has been crystallized in the pyridoxal 5′-phosphate (PLP)-bound form at pH 7.5, using polyethylene glycol as the precipitant. One crystal form corresponds to a tetragonal space group, with unit-cell dimensions a = b = 66, c = 181 Å. These crystals do not diffract beyond 5 Å, with conventional X-ray sources and cannot be used in the structure elucidation. A second crystal form is obtained when crystallization conditions are varied slightly by the addition of 0.2 M ammonium sulfate. The space group is P212121, with unit-cell dimensions a = 68.9, b = 85.5, c = 125.9 Å, indicating the presence of two molecules in the asymmetric unit (Vm = 2.26 Å3 Da−1; 46% water). These crystals diffract X-rays up to 3.2 Å using in-house facilities and a preliminary data set has been collected. A second data set using the synchrotron radiation source W32 at LURE (Paris) has shown the crystals to diffract to at least 3 Å, resolution, with good statistics. The structure determination of AOPS will provide a structural framework for the other α-amino ketone synthases for which no three-dimensional structure is yet available.
    Type of Medium: Electronic Resource
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