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Effect of overcrowding in mass spectra for six violanthrenes
Author(s) -
Ueda Toyotoshi,
Ohno Mitsuru,
Harada Hisashi,
Iwashima Satoshi,
Aoki Junji,
Kan Teruo
Publication year - 1983
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210180304
Subject(s) - mass spectrum , chemistry , ion , molecule , divalent , stereochemistry , organic chemistry
Abstract The mass spectra of six highly purified violanthrene samples of class A—(benzo[ rst ]anthro[10,1,2‐ cde ]pentaphen, benzo[ rst ]phenanthro[10,1,2‐ cde ]pentaphene), class B—(benzo[ rst ]phenanthro[1,10,9‐ cde ]pentaphene, dibenzo[ a,rst ]naphtho[8,1,2‐ cde ]pentaphene) and class T—(tetrabenzo[ a,cd,j,lm ]perylene, tetrabenzo[ de,hi,op,st ]pentacene) were measured. The dependence of relative ion instensities for monovalent, divalent and trivalent ions [M] i + , [M – 2 n ] i + and [M – 15] i + ( i = 1, 2, 3) showed clearly the effect of overcrowding in condensed aromatic rings, i.e. the number of H 2 molecules which are readily eliminated from the molecular ions is zero for class A, one for class B, and two for class T. These numbers are the same as the number of overcrowded hydrogen atom pairs for each class.