| Abstrakt: |
The mass spectra of the compounds Rh2 (RCOO)4[R=C(CH3)3 (I), CH(CH3)2 (II), CF3 (III)], Pd3(RCOO)6 [R=C(CH3)3 (IV), CH(CH3)2 (V), CF3 (VI)], Os2(RCOO)4Cl2 [R=C(CH3)3 (VII)], and Ru2(RCOO)4 [R=C(CH3)3 (VIII)] have been investigated. It has been shown that in the gaseous state compounds I–III, VII, and VIII have a dimeric structure, while compounds IV–VI have a trimeric structure. The mass spectra of compounds I–VIII show peaks of the molecular ions [M]+; and the fragmentation of the molecular ions takes place mainly with the elimination of the RCOO groups. Rearrangements with the elimination of F2O have been discovered for compounds III and VI, and rearrangements with the elimination of O=C--OH have been discovered for IV and V. The migration of a fluorine atom to the metal in compound III and its absence in compound V have been explained in the framework of the principle of hard and soft acids and bases. A scheme for the fragmentation of [M]+. under the action of electron impact has been proposed. |
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