کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1193358 | 1492367 | 2007 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Substituent effects on the second ionization energies of hydroxy- and methoxy benzenes
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
The second ionization energies of phenol and the isomeric dihydroxybenzenes as well as their methyl ethers are determined by means of charge-stripping mass spectrometry. Compared to the parent molecule benzene, introduction of a hydroxy substituent lowers the second ionization energy by ca. 0.6Â eV, whereas a methoxy substituent exerts a much more pronounced effect of about 1.6Â eV. With regard to disubstitution, the effects behave almost completely additive for the para-derivatives, whereas the ortho-compounds are stabilized only about half that much by the second substituent, and for the meta-derivatives the influence of a second donor substituent is even smaller. The trends observed highlight the role of quinoid resonance structures for the stabilization of the dicationic compounds.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Mass Spectrometry - Volume 267, Issues 1â3, 1 November 2007, Pages 134-138
Journal: International Journal of Mass Spectrometry - Volume 267, Issues 1â3, 1 November 2007, Pages 134-138
نویسندگان
Jana Roithová, Detlef Schröder,