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Electronically Excited States of Methylenecycloalkanes

机译:亚甲基环烷烃的电子激发态

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摘要

The vacuum UV spectra of methylenecyclopropane,methylenecyclobutane,methylenecyclopentane,and methylenecyclohexane have been obtained from 45000 to 70000 cm~(-1).The transitions for methylenecyclopropane have been calculated at the EOM-CCSD/6-311(2+,2+)G~** level.Using the equilibrium C=C bond lengths,the calculated transition energies are uniformly larger than observed,but increasing the bond length a small amount led to quite good agreement.Here,the transitions are found to originate from the two higher energy occupied cyclopropane ring orbitals in addition to the pi orbital.The transitions for methylenecyclohexane are found to be linearly related to those for isobutene.CIS calculations for all of the methylenecycloalkanes using somewhat lengthened C=C bonds reproduced the lower energy transition energies fairly well.
机译:在45000至70000 cm〜(-1)处获得了亚甲基环丙烷,亚甲基环丁烷,亚甲基环戊烷和亚甲基环己烷的真空紫外光谱。在EOM-CCSD / 6-311(2 +,2 +)处计算了亚甲基环丙烷的跃迁。 G〜**级。使用平衡C = C键长,计算得出的跃迁能量均匀地大于观察到的跃迁能量,但增加键长会导致相当好的一致性。在这里,发现跃迁起源于两者除π轨道外,还存在较高能量占据的环丙烷环轨道。发现亚甲基环己烷的跃迁与异丁烯的跃迁线性相关。使用稍微加长的C = C键对所有亚甲基环烷烃进行CIS计算可很好地再现出较低的能量跃迁能。

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