FAB-MS study on a series of heterotrinuclear carboxylato complexes of Cr, Mn and Fe

A series of heterotrinuclear carboxylato complexes [M2M'O (O2CR)(6)Py-3]X(M , M' = Cr, Fe, Mn; R=H, CH3, C2H5; Py = pyridine; X = O2CEt, Cl, ClO4,) are studied by the Fast Atom Bombardment Mass Spectra (FAB-MS), and the result s are reported in this paper. It has been found that there exist two kinds of recombination reaction of the trinuclear metals: the first forms two fra gmentation ions [M-3] and [M2M'], and the second forms four fragmentation i ons, [M-3], [M3M'], [MM'(2)] and [M'(3)]. The reason of the formation of th is two kinds of recombination reaction as well as their regularity were dis cussed and the sequence of the reaction rate of metals has been concluded a s: Cr > Fe > Mn.