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Electron affinities and C 60 anion clusters of certain bowl‐shaped polycyclic aromatic hydrocarbons
Author(s) -
Chen Guodong,
Ma Shuguang,
Cooks R. Graham,
Bronstein Hindy E.,
Best Michael D.,
Scott Lawrence T.
Publication year - 1997
Publication title -
journal of mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 1076-5174
DOI - 10.1002/(sici)1096-9888(199712)32:12<1305::aid-jms590>3.0.co;2-w
Subject(s) - chemistry , electron affinity (data page) , electron ionization , dimer , mass spectrometry , dissociation (chemistry) , ion , desorption , analytical chemistry (journal) , ionization , crystallography , molecule , organic chemistry , adsorption , chromatography
The kinetic method is applied to the determination of the electron affinities (EAs) of the bowl‐shaped polycyclic aromatic hydrocarbons (PAHs) dibenzo[ a , g ]corannulene (C 28 H 14 ) 1 and diindenochrysene (C 26 H 12 ) 2 using electron attachment desorption chemical ionization mass spectrometry (DCI‐MS) and triple‐quadrupole tandem mass spectrometry. The estimated EAs of 1 and 2 are 1.00±0.20 and 1.16±0.20 eV respectively. In an analogous experiment, loosely bound dimeric radical anions comprising C 60 with 1 and C 60 with 2 were generated in the gas phase by electron attachment desorption chemical ionization. The collision‐induced dissociation of each of these cluster ions yields both the monomeric radical anions as products and yields calculated electron affinities of C 60 of 1.20±0.20 eV (C 60 /1 dimer) and 1.24±0.20 eV (C 60 /2 dimer). These values are significantly different from the known electron affinity of C 60 (2.65 eV) and support previous studies on electron‐bound dimers comprising C 6O and coronene [G. Chen, R. G. Cooks, E. Corpuz and L. T. Scott, J . Am . Soc . Mass Spectrom . 7, 619 (1996)] in showing that the dissociation of electron‐bound dimers comprising C 60 and reference PAHs is controlled by the electron affinity of a portion of the C 60 surface, i.e. that a ‘local’ electron affinity of C 60 is measured. The ‘local’ electron affinity value corresponds approximately to the electron affinity of the reference PAHs, C 60 exhibiting an affinity for the ‘extra’ electron in the cluster which approximately matches that of its PAH partner. © 1997 by John Wiley & Sons, Ltd.