Analytical Chemistry and Spectroscopy
Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
The main fragmentation of the compounds MX3-noxn (oxH=8-quinolinol. n = 3; M=AL, Ga, In, Sc, Cr or Fe. n = 2; M=In or Fe; X=Cl or Br. InIox2. n = 1; M=AL, In or Fe; X= Cl or Br) involves loss of X and intact ox. radicals. The comparative abundances of the fragments are primarily related to the common oxidation states of the metals. For example, all the Mox3 compounds show the ions [Mox3]+ and [Mox2]+. The ions [Mox]+ and [M]+ are present when M=Ga, In, Cr or Fe but for the elements with only one oxidation state (Al or Sc) [M]+ is absent and [Mox]+ has only very low abundance. When M= Cr or Fe metal-containing ions arising from loss of species such as CO, H2O, HX, C2H2, H and OH by fragmentation of the ox ligand are also present; this behaviour is rationalised in terms of the ability of these metals to undergo a unit change in oxidation state. When n=1 the ions [MXox2]+ and [Mox2]+ and when n= 2 the ions [MX2ox]+ and [Mox3]+ are present; these ions arise by ionization and fragmentation of species formed by redistribution reactions in the mass spectrometer.
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