ISSN:
1572-8862
Keywords:
252Cf-PDMS
;
metal cluster
;
metal carbonyl
;
mass spectrometry
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract 252Cf-Plasma Desorption Mass Spectrometry (252Cf-PDMS) has been used to investigate the [(Ph3PCH2C5H4)Fe(C5H5)]+ salt of the prototype dianionic, platinum carbonyl cluster, [Pt3(CO)3(μ2-CO)3] 3 2− . An envelope of singly charged [Pt9(CO) x ]− ions with the principal peak centered atx=8 was observed in the negative ion mass spectrum as a result of successive losses of the carbonyl ligands from the intact platinum core. Another feature of the negative ion spectrum was the prominent occurrence of other envelopes of multiple peaks which conform to Pt12, Pt15, Pt18, Pt21, and Pt24 singly charged metal cores. An unexpected observation was the presence of singly charged positive ions of the dianionic cluster which were formed without incorporation of the counterion. A similar but, largely unresolvable, broad envelope of singly charged ions containing the Pt9 core resulted with a peak maximum corresponding closely to the completely carbonylated cluster. The peak distribution extended from the fully decarbonylated cluster to well beyond the mass of the fully carbonylated cluster. Analogous peaks attributable to singly charged positive ions of the Pt12, Pt15, and Pt18 clusters were also evident. Very little fragmentation was observed below the molecular ion in either the positive or negative ion mass spectra except for ions associated with the counterion. A detailed analysis of the mass spectra, including the types of ions observed and correlations with the molecular architecture are described.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00703737
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