The series of carbonyl nitro monoanions [M(CO)5(NO2)]–(M = Cr, Mo or W) has been isolated as their N(PPh3)2+ salts from the reaction of the parent hexacarbonyl, M(CO)6, with Me3NO in CH2Cl2 in the presence of [N(PPh3)2][NO2] and has been fully characterised in solution by IR spectroscopy and by single-crystal X-ray diffraction studies in the solid for M = Cr or W as the PPh4+ salt.
A. Sieker, A. J. Blake, S. Parsons and B. F. G. Johnson, J. Chem. Soc., Dalton Trans., 1995, 1391 DOI: 10.1039/DT9950001391
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