Field ionisation/field desorption mass spectrometry of polynuclear metal carbonyls

Abstract

Field ionisation/field desorption mass spectra are reported for Mn2(CO)10, Cd[Co(CO)4]2 and some adducts, In[Co(CO)4]3, bipy•Zn[Co(CO)4]2, and bipy•M[Mn(CO)5]2 (M = Zn, Cd). The spectra are extremely simple, and the small number of easily identified species includes the molecular ion in some cases. The relative abundance of the fragments is discussed in terms of known stabilising factors in such compounds. No spectra could be obtained from Co2(CO)8 or Fe2(CO)9, which may be the result of their carbonyl-bridged structures.

Indium(III) compounds with the 2-[(dimethylamino)methyl]phenyl ligand

“…Weak molecular ions were detected for L2InCH3' and LzInC6Hst, and LInCH,' and LlnC6Hst ions are also present in low but significant abundance. The formation of such singly charged MX2+ ions is usual for indium(II1) compounds (16,17). The FD spectrum of L21nCl is quite different from those just discussed.…”

Zinc(II) and cadmium(II) compounds with the 2-[(dimethylamino)methyl]phenyl ligand

“…No C d t ions were detected, and m/e values up to -800 were recorded. Such ions, which result from ionisation of aggregates, are not uncommon in F D mass spectrometry (22). More importantly, a series of ions at m/e = 378-386 clearly arise from the various isotopic forms of c~L:.…”