Mechanism of photodissociation of polyatomic molecules through the polarized fluorescence of fragments

Gelin, Maxim F.; Polubisok, S. A.; Tolkachev, V. A.; Блохин, А. П.

doi:10.1016/s0022-2860(96)09524-5

Journal of Molecular Structure

1997

DOI: 10.1016/s0022-2860(96)09524-5

|View full text |Cite

Mechanism of photodissociation of polyatomic molecules through the polarized fluorescence of fragments

Maxim F. Gelin¹,

S. A. Polubisok²,

V. A. Tolkachev³

et al.

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...

Citation Types

Supporting

Mentioning

Contrasting

Year Published

1998

2006

Publication Types

Select...

Article5

Relationship

Self Cite0

Independent5

Authors

Journals

Cited by 6 publications

(2 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In [13], P fl = 8.3% was obtained for excitation of POPOP vapor heated to 643 K. The constancy of the measured values of the degree of polarization for the fluorescence of the vapor over a broad temperature interval (10-643 K) is supported by the theoretical model in [12], but the experimental values of P fl are ≈2% lower than the theoretically predicted values. In a 5:5:2 diethyl ether:petroleum ether:isopropyl alcohol glassy matrix (EPIP) at 77 K, the value of P fl for POPOP is also lower than the lim- iting value: 42.4% [13].…”

mentioning

confidence: 87%

“…The expected values of the degree of polarization (calculated in the rigid top approximation [12]) are 10.4% for the cis form and 11.6% for the trans form of the POPOP molecules. In [13], P fl = 8.3% was obtained for excitation of POPOP vapor heated to 643 K. The constancy of the measured values of the degree of polarization for the fluorescence of the vapor over a broad temperature interval (10-643 K) is supported by the theoretical model in [12], but the experimental values of P fl are ≈2% lower than the theoretically predicted values.…”

mentioning

confidence: 89%

See 1 more Smart Citation

Spectral characteristics of heterocyclic compounds with a chain structure, cooled in an ultrasonic jet

Поведайло

Yakovlev

2006

J Appl Spectrosc

View full text Add to dashboard Cite

the fluorescence spectra of POPOP, under conditions where the molecules were cooled in an ultrasonic helium jet. A line structure is observed in the spectra of POPOP and TOPOT; for the BPO molecules, whose configuration changes considerably during electronic excitation, vibrational structure is apparent only in the low-frequency region of the excitation spectrum, and a diffuse spectrum is recorded starting from ν 0 0 + 200 cm -1 . For all the compounds, in the spectra we recorded vibrations with frequencies up to 100 cm -1 , arising due to the flexibility of the molecular structure. The rotational contours of the lines for the electronic and vibronic transitions of the POPOP molecules (T rot = 10.5 K) and TOPOT molecules (T rot = 15 K) are structureless and bell-shaped. The degree of polarization of the fluorescence P fl for the jet-cooled POPOP molecules for excitation of vibrations along the absorption band up to 2000 cm -1 above ν 0 0 is practically constant (,8.4%) and matches P fl for high-temperature vapors.Introduction. In complex organic molecules with a chain structure, consisting of phenyl and oxazole rings linked by >C-C< single bonds, in the ground state these rings may be rotated relative to each other under the influence of electrostatic repulsion of adjacent nuclei of the ring hydrogen atoms. During electronic excitation, in such molecules substantial conformational rearrangements may occur which are manifested in the fluorescence excitation spectra as low-frequency vibrations of a phenyl group relative to the rest of the molecule. Such flexibility should affect the inertial characteristics of the molecule and consequently the shape of the rotational contour of the vibronic transition lines.Studies to date on the low-frequency vibrations and their potential energy surfaces have been conducted for a number of molecules under jet-cooling conditions: biphenyl [1], 9,9′-bianthryl [2], 9-phenylanthracene [3], 2-phenylindole [4], etc., for which the equilibrium configuration is nonplanar in the ground state while generally electronic excitation leads to a more planar structure.In this work, we have studied the effect of the flexibility of heterocyclic molecules with a chain structure on the fluorescence excitation spectra, the fluorescence spectra, the rotational contours of the bands for purely electronic and vibronic transitions, and the polarization of fluorescence for such molecules cooled in an ultrasonic jet. We have also carried out quantum chemical calculations for the structure of the molecules. As the objects of investigation, we selected 2-phenyl-5-(4-diphenylyl)oxazole (BPO), 1,4-di[2-(5-phenyloxazolyl)]benzene (POPOP), and 1,4-di[2-(5-n-tolyloxazolyl)]benzene (TOPOT), which are known as scintillators and are active media of lasers in gas and condensed phases [5].Experimental procedure. The fluorescence excitation and fluorescence spectra were measured using the spectrometric system described in [6]. The ultrasonic jet was formed by discharge of a mixture of vapor of the organic

show abstract

mentioning

confidence: 87%

mentioning

confidence: 89%

Spectral characteristics of heterocyclic compounds with a chain structure, cooled in an ultrasonic jet

Поведайло

Yakovlev

2006

J Appl Spectrosc

View full text Add to dashboard Cite

show abstract

Polarized fluorescence of radicals in photodissociation of disulfides in the gas phase

Блохин¹,

Gelin²,

Kalosha³

et al. 1999

J Appl Spectrosc

View full text Add to dashboard Cite

Fluorescence of free complex molecules

Tolkachev¹

1998

J Appl Spectrosc

View full text Add to dashboard Cite

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

customersupport@researchsolutions.com

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Mechanism of photodissociation of polyatomic molecules through the polarized fluorescence of fragments

Cited by 6 publications

References 9 publications

Spectral characteristics of heterocyclic compounds with a chain structure, cooled in an ultrasonic jet

Spectral characteristics of heterocyclic compounds with a chain structure, cooled in an ultrasonic jet

Polarized fluorescence of radicals in photodissociation of disulfides in the gas phase

Fluorescence of free complex molecules

Contact Info

Product

Resources

About