Electronic absorption spectrum of the cyclopentadienyl radical (C5H5) and its deuterated derivatives

1970 ◽  
Vol 48 (8) ◽  
pp. 964-969 ◽  
Author(s):  
R. Engleman Jr. ◽  
D. A. Ramsay
Keyword(s):  
Absorption Spectrum ◽  
Electronic Absorption Spectrum ◽  
Electronic Absorption ◽  
Flash Photolysis ◽  
Hydrogen Atoms ◽  
Isotope Shifts ◽  
Isotopic Species ◽  
Cyclopentadienyl Radical

The spectrum first observed by Thrush during the flash photolysis of cyclopentadiene has been reinvestigated using deuterated compounds. Eight different spectra have been observed and have been assigned to the isotopic species: cyclopentadienyl-d0, -d1, -1,2-d2, -1,3-d2, -1,2,3-d3, -1,2,4-d3, -d4 and –d5. The isotope shifts and the absence of further deuterated species establish unequivocally the assignment of the carrier, and show furthermore that the five hydrogen atoms and five carbon atoms are effectively equivalent.

The electronic spectra of phenyl radicals

1965 ◽  
Vol 287 (1411) ◽  
pp. 457-470 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Electronic Absorption Spectrum ◽  
Electronic Absorption ◽  
Ground State ◽  
Electronic Spectra ◽  
Flash Photolysis ◽  
Visible Region ◽  
Electronic Configuration ◽  
Vibrational Structure ◽  
Fundamental Frequencies

An electronic absorption spectrum, attributed to phenyl, has been observed in the visible region with origin at 18 908 cm -1 after flash photolysis of benzene and halogenobenzenes. Similar spectra of fluoro, chloro and bromo phenyl are observed after flash photolysis of disubstituted benzenes. The vibrational structure of the phenyl spectrum has been analysed in terms of two fundamental frequencies at 571 and 896 cm -1 which correspond to the e 2 g and a 1 g frequencies of the B 2 u state of benzene. The ground state of phenyl has a π 6 n electronic configuration and the observed transition is interpreted as 2 A 1 → 2 B 1 resulting from a π → n excitation.

THE 1Πu ← 1Δg ELECTRONIC SPECTRUM OF NCN

1967 ◽  
Vol 45 (4) ◽  
pp. 1439-1450 ◽  
Author(s):  
H. W. Kroto
Keyword(s):  
Absorption Spectrum ◽  
Electronic Absorption Spectrum ◽  
Electronic Spectrum ◽  
Electronic Absorption ◽  
Ground State ◽  
Flash Photolysis ◽  
Bond Distance ◽  
Splitting Parameter

The analysis of a new electronic absorption spectrum observed during the flash photolysis of cyanogen azide, NCN3, in the region 3 327 Å indicates that the spectrum belongs to a 1Πu–1Δg transition of NCN. The 1Δg state is metastable with respect to the [Formula: see text] ground state. The bond distance in the 1Δg state is 1.228 5 Å. The value of the Renner splitting parameter, εω2, for the 1Πu state has been determined as −84.2 cm−1.

Ortho effects on the change in electronic absorption spectrum of pyridinium salts of saturated bromohydrocarbon

2009 ◽  
Vol 74 (5) ◽  
pp. 1084-1089 ◽  
Author(s):  
Jin-Ling Song ◽  
Li-Ming Gong ◽  
Shou-Ai Feng ◽  
Jiang-Hong Zhao ◽  
Jian-Feng Zheng ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
Electronic Absorption Spectrum ◽  
Electronic Absorption ◽  
Pyridinium Salts

The nature of the electronic absorption spectrum of 1, 3, 5-triphenylpyrazoline-?2

1971 ◽  
Vol 14 (2) ◽  
pp. 221-224 ◽  
Author(s):  
O. G. Korneeva ◽  
L. M. Kutsyna ◽  
V. G. Tishchenko
Keyword(s):  
Absorption Spectrum ◽  
Electronic Absorption Spectrum ◽  
Electronic Absorption
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