The far ultra-violet spectra of some branched chain iodo-alkanes, iodo-cyclo-alkanes, fluoro-iodo-alkanes and iodo-alkenes
The far ultra-violet spectra of some branched chain iodo-alkanes, iodo-cyclo-alkanes, fluoro-iodo-alkanes and iodo-alkenes
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DOI：
10.1080/00268977200101871
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发表时间：
1972-10
影响因子：
1.7
通讯作者：
R. Boschi;D. Salahub
中科院分区：
文献类型：
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作者：
R. Boschi;D. Salahub
远紫外光谱范围为：1-碘-2-甲基丙烷、1-碘-3-甲基丁烷、2-碘丙烷、碘-环戊烷、碘-环己烷、2-碘-2-甲基丙烷、1,1,1-三氟-2-碘乙烷、1,1,1,2,2,3,3-七氟-3-碘丙烷、碘乙烯基和碘烯基。大多数光谱与1-碘烷烃的光谱相当相似。证明了碘环己烷存在轴向构象和平伏构象。氟取代了部分或全部的氢，导致光谱向高能区转移，但最低能带除外。由于电离势也转移到更高的能量，在A能带的情况下，激发态σ*能级也必须稳定。对于碘化乙烯基和碘化烯丙基，出现了新的带，暂定为π*←n和π*←π跃迁。
The far-ultra-violet spectra between 30 000 and 90 000 cm-1 are presented for: 1-iodo-2-methylpropane, 1-iodo-3-methylbutane, 2-iodopropane, iodo-cyclopentane, iodocyclohexane, 2-iodo-2-methylpropane, 1,1,1-trifluoro-2-iodoethane, 1,1,1,2,2,3,3-heptafluoro-3-iodopropane, vinyl iodide, and allyl iodide. Most of the spectra are reasonably similar to those of the 1-iodoalkanes. The existence of axial and equatorial conformers of iodocyclohexane is shown. The substitution of fluorine for some or all of the hydrogens causes a shift to higher energy of the spectra, with the exception of the lowest energy bands. Since the ionization potentials are also shifted to higher energy, the excited σ* level must also be stabilized in the case of the A bands. For vinyl iodide and allyl iodide new bands appear which are tentatively assigned to π* ←n and π* ←π transitions.