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Analytical Pyrolysis. Techniques and Applications by Kent J. Voorhees

By Kent J. Voorhees

1984 (this quantity is the results of lectures offered on the 5th overseas Symposium on Analytical Pyrolysis, held at Vail, Colorado), hardcover variation, Butterworths, London, U.K. Hardcover name, 486 pages

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Negative LMS of o-Dinitrobenzene The formation of (M+15)~ most likely results from a nucleophilic substitution reaction on the aromatic ring, induced by the laser. The net process is substitution of an oxygen atom and an elimination of hydrogen; the peak can be written as (MfO-H)". It 28 is not immediately obvious what chemical reaction is responsible for the (MH-15)" peak· Several possibili­ ties are shown below· These correspond to substitu­ tion by 0""·, 02~ # and NO2": ArH + 0 — > Ar(T + H· ArH + O2"· — > ArH + N0 2 ~ (3) ArO" + OH· (4) > ArO" + HNO (5) Nevertheless, it is quite interesting that this kind of chemistry can occur with high probability in the laser plasma· The intensity of the (MH)-H)" peak is negligible in the case of m- and p-dinitrobenzene· Obviously some interaction between the two nitro groups of the ortho compound and the other isomers is necessary for the formation of the (M+15)~ peak.

However, the negative ion spectrum has as base peak m/z 93 corresponding to the phenoxide ion. Thus, the key chemical information for this polymer is shown by the negative-ion spectrum. An interesting characteristic of the negative ion spectra of most hydrocarbon polymers is that they contain the C n ~, C^H"" species similarly to aromatic hydrocarbons. It is of particular interest to note 38 Poly ( phenylmelhocrylote ) (o) Positive Ion Spectrum (b) Negative Ion Spectrum -°-® CH, I T * · o=c- CM,—C- Z S C4H0" cò2- "— V * / -C,HO 9o > It, I 20 Fig.

Ion Phys. 1969, _2, 500-503. Mcfariane, R. ; McNeal, C. ; Hunt, J. , Adv. Mass Spectrom. 1980, 8A, 349-54. , Appi· Phys. 1976, _U, 35-39. ; Bordoli, R. ; Sedgwick, R. ; Tyler, A. , J. Chem. Soc. Chem. Comm. 1981, 325-27. Honig, R. ; Woolston, J. , Appi. Phys. Letters 1963, 2_, 138. Conzemius, R. ; Capellen, J. , Int. J. Mass Spectrom. Ion Phys. 1980, _34-, 197-271. , Israel J. Chem. 1978, 17, 181-84. 40 9. 10. 11· 12. 13. 14. 15. 16. 17. 18. 19. ; Natusch, D. F. , Anal. Chem. 1982, J54, 26Α. Hercules, D.

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