“…In the example of Figure , this gives a value of I = 5.74 eV. The lowest electronic excitation energy ( E ex ) was deduced from the energy of the peak or shoulder in the UV−visible absorption spectrum of each polymer solution. ,,− The observed values of E ex are listed in Table together with the solvent used. 2 UPS spectrum of poly[3-(trimethylsilyl)-1-octyne] ( 6 ).…”
Section: Methodsmentioning
confidence: 99%
“…The lowest electronic excitation energy (E ex ) was deduced from the energy of the peak or shoulder in the UVvisible absorption spectrum of each polymer solution. 2,3,[13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] The observed values of E ex are listed in Table 1 together with the solvent used.…”
Ionization threshold energies of 26 substituted polyacetylenes
were determined by ultraviolet photoelectron
spectroscopy. Examination of the data obtained, along with data
for other polymers, and the energy of the
lowest energy electronic excitation revealed that the threshold
energies correspond to the photoemission from
the highest occupied orbitals in the π-conjugated main chains.
For the majority of the polymers, the main
origin of the significant variation of threshold energy and electronic
excitation energy is ascribed to the change
of the degree of π-conjugation due to steric hindrance of
substituents. Calculations with Hückel theory
gave
semiquantitative agreement with the observed results. Polymers
with Cl substituents at the main chain also
showed a large inductive effect by the electron-withdrawing Cl atom.
The HOMO of these polymers was
found to be derived from the π-conjugated main chain.
“…In the example of Figure , this gives a value of I = 5.74 eV. The lowest electronic excitation energy ( E ex ) was deduced from the energy of the peak or shoulder in the UV−visible absorption spectrum of each polymer solution. ,,− The observed values of E ex are listed in Table together with the solvent used. 2 UPS spectrum of poly[3-(trimethylsilyl)-1-octyne] ( 6 ).…”
Section: Methodsmentioning
confidence: 99%
“…The lowest electronic excitation energy (E ex ) was deduced from the energy of the peak or shoulder in the UVvisible absorption spectrum of each polymer solution. 2,3,[13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] The observed values of E ex are listed in Table 1 together with the solvent used.…”
Ionization threshold energies of 26 substituted polyacetylenes
were determined by ultraviolet photoelectron
spectroscopy. Examination of the data obtained, along with data
for other polymers, and the energy of the
lowest energy electronic excitation revealed that the threshold
energies correspond to the photoemission from
the highest occupied orbitals in the π-conjugated main chains.
For the majority of the polymers, the main
origin of the significant variation of threshold energy and electronic
excitation energy is ascribed to the change
of the degree of π-conjugation due to steric hindrance of
substituents. Calculations with Hückel theory
gave
semiquantitative agreement with the observed results. Polymers
with Cl substituents at the main chain also
showed a large inductive effect by the electron-withdrawing Cl atom.
The HOMO of these polymers was
found to be derived from the π-conjugated main chain.
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