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SOLVED:The FEMO theory (Problem 9.12 ) of conjugated molecules is crude and marginally better results are obtained with simple Hückel theory. (a) For a linear conjugated polyene with each of N carbon atoms contributing an electron in a 2 p orbital, the energies Ek of the resulting πmolecular orbitals are given by: Ek=α 2 βcos(k π)/(N 1) k=1,2,3, … N Use this expression to estimate the resonance integral βfor the series consisting of ethene, butadiene, hexatriene, and octatetraene given tha

SOLVED:The FEMO theory (Problem 9.12 ) of conjugated molecules is crude and marginally better results are obtained with simple Hückel theory. (a) For a linear conjugated polyene with each of N carbon atoms contributing an electron in a 2 p orbital, the energies Ek of the resulting πmolecular orbitals are given by: Ek=α 2 βcos(k π)/(N 1) k=1,2,3, … N Use this expression to estimate the resonance integral βfor the series consisting of ethene, butadiene, hexatriene, and octatetraene given tha

2020年6月12日

SOLVED: A particle in a box crude model of the distribution and energy of electrons in conjugated molecules, such as carotene. Carotene has 22 single and double bonds (11 of each) alternating along the chain of carbon atoms. Take each C-C bond length to be about 140 pm and suppose that the first possible upward transition is from n = 11 to n = 12. Estimate the wavelength of this transition. For L, the box length, remember to multiply 140 pm by 22, which equals 3080 pm or 3.08 nm. The actual leng

SOLVED: A particle in a box crude model of the distribution and energy of electrons in conjugated molecules, such as carotene. Carotene has 22 single and double bonds (11 of each) alternating along the chain of carbon atoms. Take each C-C bond length to be about 140 pm and suppose that the first possible upward transition is from n = 11 to n = 12. Estimate the wavelength of this transition. For L, the box length, remember to multiply 140 pm by 22, which equals 3080 pm or 3.08 nm. The actual leng

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When β-carotene is oxidized in vivo, it breaks in half and forms two molecules of retinal (vitamin A), which is a precursor to the pigment in the retina responsible for vision (Impact 114. I). The conjugated system of retinal consists of 11 C atoms and one O atom. In the ground state of retinal, each level up to n=6 is occupied by two electrons. Assuming an average internuclear distance of 140 pm, calculate (a) the separation in energy between the ground state and the first excited state in whic

When β-carotene is oxidized in vivo, it breaks in half and forms two molecules of retinal (vitamin A), which is a precursor to the pigment in the retina responsible for vision (Impact 114. I). The conjugated system of retinal consists of 11 C atoms and one O atom. In the ground state of retinal, each level up to n=6 is occupied by two electrons. Assuming an average internuclear distance of 140 pm, calculate (a) the separation in energy between the ground state and the first excited state in whic

2021年6月20日

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