Abstract
Electrospray mass spectra have been observed for a number of ionic inorganic and organometallic compounds in dichloromethane/methanol (1:10) solutions. Intact principal ions were observed directly for [PPh 3Bz] +, NBu 4PF 6 (positive and negative), [Fe(C 5H 5)2] + and trans-[Cr(CO) 2(dpe) 2] + (dpe=Ph 2PCH 2CH 2PPh 2). The non-ionic compound Re(CO) 2Br(η 1-dpm)(η 2-dpm)(dpm=Ph 2PCH 2PPh 2) was reacted with MeI to convert the pendant phosphorus to a phosphonium salt to give [Re(CO) 2Br(η 1-dpmMe)(η 2-dpm)]I whose principal ion was observed. The heteropolymolybdate (NEt 4) 4[S 2Mo 18O 62] in acetonitrile solution gave the intact [S 2Mo 18O 62] 4− ion. These systems show that electrospray mass spectrometry has great promise for investigating ionic compounds, particularly those that are not amenable to mass spectrometric studies via other ionization techniques.
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