MASS SPECTRA OF ORGANOMETALLIC COMPOUNDS .9. COMPOUNDS WITH METAL-METAL BONDS

The mass spectra of the following compounds have been investigated: (i) The organotin derivatives (CH3)3SnMo(CO)3C5H5 and (CH3)3SnNCW(CO)5; (ii) The mercury derivatives Hg[Mn(CO)5]2, Hg[Co(CO)4]2, Hg[Mo(CO)3C5H5]2 and ClHgMo(CO)3C5H5; (iii) The polynuclear cyclopentadienyl metal derivatives [C5H5Ru(CO)2]2, [C5H5Cr(CO)3]2, [C5H5Cr(NO)2]2 and [C5H5Fe‐CO]4; (iv) The trinuclear cobalt carbonyl derivatives YCCo3(CO)9 (Y = Cl and CH3); (v) The binuclear triene‐iron carbonyl derivatives C4H4Fe2(CO)6 and C8H10Fe2(CO)6. The mass spectra of the trimethyltin derivatives exhibited stepwise loss of methyl groups as well as of carbonyl groups. The mass spectra of the mercury derivatives exhibited the facile loss of mercury. The mass spectrum of [C5H5Cr(CO)3]2 indicated a very weak chromium‐chromium bond since it exhibited no ion containing two chromium atoms. The mass spectrum of the nitrosyl derivative [C5H5Cr(NO)2]2 exhibited the stepwise loss of its four nitrosyl groups. The mass spectrum of [C5H5FeCO]4 was rather complex and exhibited a variety of unusual processes including eliminations of neutral Fe and C5H5Fe fragments. Unusual ions observed in the mass spectrum of CH3CCo3(CO)9 include the bare polymetallic ions [Con]+ (n = 3 and 2). Many examples of the elimination of neutral CO, C2H2 and H2 fragments were noted in this work. Copyright © 1969 John Wiley & Sons, Ltd.