Fragmentation patterns of organic

Common Mass Spectral Fragmentation Patterns of Organic Compound Families.8-69... 

COMMON MASS SPECTRAL FRAGMENTATION PATTERNS OF ORGANIC... 

In addition to forming molecular ions, organic molecules decompose into fragment ions in a mass spectrometer. As a result, a host of ions form that have a m/z less than that of the molecular ion. These ions give rise to the characteristic mass spectrum of the molecule. The fragmentation pattern of a molecule is characteristic of the molecule, and an unknown compound may be identified by comparison with a catalog of standard spectra. 

The main fragmentation patterns of a series of metallocene carbinols have been elucidated by means of deuterium labeling (92). Elimination of water occurred by several mechanisms, some of which have not been observed in the purely organic counterparts, indicating involvement of the central metal atom. Stereoisomeric cyclic carbinols have been distinguished on the basis of intensity ratios of the ions P+, (P — H20)+, and (P —2H20)+ (93) or of FeCp+ and CpFeOH+ (178). 

Common Fragmentation Patterns of Families of Organic Compounds Common Fragments Lost... 

COMMON FRAGMENTATION PATTERNS OF FAMILIES OF ORGANIC COMPOUNDS... 

Mass spectrometry of organic molecules has become well established in recent years and both the recording of spectra and the fragmentation patterns of functional groups have been comprehensively discussed (14, 19, 33, 126, 142). In the last 2 3 years the study of the behavior of organometallic compounds in the mass spectrometer, previously a neglected... 

Table 3 Fragmentation Patterns of Selected Organic Moleculesa,b,c... 

Ablation, which is fragmentation or dissociation, is involved in every proeess, i.e., monomer to reaetive speeies, plasma polymer to reaetive speeies, wall surface to reactive speeies, and eseape of fragmented speeies from the system. Fragmentation of moleeules is the primary effeet of plasma exposure to a material. The importanee of ablation can be visualized in the well-established fragmentation patterns of many organic materials, whieh eonstitute the foundation of seeondary ion mass spectroscopy (SIMS). 

The decay-induced fragmentation pattern of a number of representative organic molecules has been determined with appropriate mass spectrometric techniques (7), showing that, in most cases, the daughter organic cation escapes further dissociation, for example, the methyl cation from Equation 1 is obtained with a 82% yield, being formed in its ground electronic state with little or no vibrational excitation. 

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