Fluorescence lifetimes and radiative rate constants of alkanes at 25°C

Ralf Hermann, Reiner Mehnert, L. Wojnárovits

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Fluorescence lifetimes of 33 alkanes were measured at 25°C using a 0.7 ns pulse radiolysis system and the relationship between molecular structure, fluorescence lifetime (τ), quantum yield (Φf) and radiative rate constant (R = Φf τ) is discussed. The τ's showed a large dependence on the molecular structure, however, the R-values were approximately constant for groups of alkanes: R = 1.3×106 s-1 for n-alkanes, R ≈ 4×106 s-1 for aliphatic vicinally substituted dimethyl alkanes, R = 7×106 s-1 for cyclohexane and alkylcyclohexanes, and R = 10×106 s-1 for di- and trimethylcyclohexanes. The excited state lifetimes of some non-fluorescing alkanes were also determined from steady-state photolytic quenching data and found to be very low (≤ 0.3 ns).

Original languageEnglish
Pages (from-to)69-78
Number of pages10
JournalJournal of Luminescence
Volume33
Issue number1
DOIs
Publication statusPublished - 1985

Fingerprint

Alkanes
alkanes
Rate constants
Fluorescence
life (durability)
fluorescence
Molecular Structure
Molecular structure
molecular structure
Pulse Radiolysis
Radiolysis
Quantum yield
radiolysis
Excited states
cyclohexane
Quenching
quenching
pulses
excitation

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Atomic and Molecular Physics, and Optics

Cite this

Fluorescence lifetimes and radiative rate constants of alkanes at 25°C. / Hermann, Ralf; Mehnert, Reiner; Wojnárovits, L.

In: Journal of Luminescence, Vol. 33, No. 1, 1985, p. 69-78.

Research output: Contribution to journalArticle

@article{975cc33002e244d7b0bcaa980ee97a8d,
title = "Fluorescence lifetimes and radiative rate constants of alkanes at 25°C",
abstract = "Fluorescence lifetimes of 33 alkanes were measured at 25°C using a 0.7 ns pulse radiolysis system and the relationship between molecular structure, fluorescence lifetime (τ), quantum yield (Φf) and radiative rate constant (R = Φf τ) is discussed. The τ's showed a large dependence on the molecular structure, however, the R-values were approximately constant for groups of alkanes: R = 1.3×106 s-1 for n-alkanes, R ≈ 4×106 s-1 for aliphatic vicinally substituted dimethyl alkanes, R = 7×106 s-1 for cyclohexane and alkylcyclohexanes, and R = 10×106 s-1 for di- and trimethylcyclohexanes. The excited state lifetimes of some non-fluorescing alkanes were also determined from steady-state photolytic quenching data and found to be very low (≤ 0.3 ns).",
author = "Ralf Hermann and Reiner Mehnert and L. Wojn{\'a}rovits",
year = "1985",
doi = "10.1016/0022-2313(85)90030-4",
language = "English",
volume = "33",
pages = "69--78",
journal = "Journal of Luminescence",
issn = "0022-2313",
publisher = "Elsevier",
number = "1",

}

TY - JOUR

T1 - Fluorescence lifetimes and radiative rate constants of alkanes at 25°C

AU - Hermann, Ralf

AU - Mehnert, Reiner

AU - Wojnárovits, L.

PY - 1985

Y1 - 1985

N2 - Fluorescence lifetimes of 33 alkanes were measured at 25°C using a 0.7 ns pulse radiolysis system and the relationship between molecular structure, fluorescence lifetime (τ), quantum yield (Φf) and radiative rate constant (R = Φf τ) is discussed. The τ's showed a large dependence on the molecular structure, however, the R-values were approximately constant for groups of alkanes: R = 1.3×106 s-1 for n-alkanes, R ≈ 4×106 s-1 for aliphatic vicinally substituted dimethyl alkanes, R = 7×106 s-1 for cyclohexane and alkylcyclohexanes, and R = 10×106 s-1 for di- and trimethylcyclohexanes. The excited state lifetimes of some non-fluorescing alkanes were also determined from steady-state photolytic quenching data and found to be very low (≤ 0.3 ns).

AB - Fluorescence lifetimes of 33 alkanes were measured at 25°C using a 0.7 ns pulse radiolysis system and the relationship between molecular structure, fluorescence lifetime (τ), quantum yield (Φf) and radiative rate constant (R = Φf τ) is discussed. The τ's showed a large dependence on the molecular structure, however, the R-values were approximately constant for groups of alkanes: R = 1.3×106 s-1 for n-alkanes, R ≈ 4×106 s-1 for aliphatic vicinally substituted dimethyl alkanes, R = 7×106 s-1 for cyclohexane and alkylcyclohexanes, and R = 10×106 s-1 for di- and trimethylcyclohexanes. The excited state lifetimes of some non-fluorescing alkanes were also determined from steady-state photolytic quenching data and found to be very low (≤ 0.3 ns).

UR - http://www.scopus.com/inward/record.url?scp=0022024766&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0022024766&partnerID=8YFLogxK

U2 - 10.1016/0022-2313(85)90030-4

DO - 10.1016/0022-2313(85)90030-4

M3 - Article

VL - 33

SP - 69

EP - 78

JO - Journal of Luminescence

JF - Journal of Luminescence

SN - 0022-2313

IS - 1

ER -