Excimers of organic molecules

Barashkov, N. N.; Сахно, Т. В.; Nurmukhametov, R. N.; Khakhel, O. A.

doi:10.1070/rc1993v062n06abeh000032

Cited by 65 publications

(40 citation statements)

References 179 publications

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“…, (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17) where k rad E and k rad M are the rate constants for the radiative decay of the excimer and the excited monomer. In practice, an upper integration limit t ∞ ≈ 10/(k S ) min will be virtually equivalent to infinity.…”

Section: Evolution Of the 1 M * · · · 1 M Pair Distribution Functionmentioning

confidence: 99%

“…First, for each discrete time t the corresponding mean radii R E (t) and R M (t) are calculated, (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18) with an analogous expression for R M (t). First, for each discrete time t the corresponding mean radii R E (t) and R M (t) are calculated, (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18) with an analogous expression for R M (t).…”

Section: Evolution Of the 1 M * · · · 1 M Pair Distribution Functionmentioning

confidence: 99%

“…In the literature on excimers of aromatic compounds prevails the idea that the spectrum of an excimer fluorescence is always structureless and differs completely from the spectrum of a monomer fluorescence [1][2][3][4][5][6][7][8]. This idea is based on a potential energy diagram, in which the interaction potential between two molecules in their electronic ground states is completely repulsive [1,2].…”

Section: Introductionmentioning

confidence: 99%

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Delayed Excimer Fluorescence of Fluoranthene Due to Triplet-Triplet Annihilation: Systematic Study of the Fluorescence from a Weakly Bound Excimer

Gehring¹,

Nickel²

2001

Zeitschrift Für Physikalische Chemie

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Section: Evolution Of the 1 M * · · · 1 M Pair Distribution Functionmentioning

confidence: 99%

Section: Evolution Of the 1 M * · · · 1 M Pair Distribution Functionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Delayed Excimer Fluorescence of Fluoranthene Due to Triplet-Triplet Annihilation: Systematic Study of the Fluorescence from a Weakly Bound Excimer

Gehring¹,

Nickel²

2001

Zeitschrift Für Physikalische Chemie

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“…The class of compounds under study is characterized by the formation of structured organic systems, including dimers, trimers and aggregates of conjugated molecules, whose supramolecular architecture produces a unique complex of intermolecular interactions comprised from dipole-dipole, dimer (excimer) and stacking interactions [8,9].…”

Section: Introductionmentioning

confidence: 99%

Luminescence and crystal structure of 2,2-difluoro-4-(9-anthracyl)-6-methyl-1,3,2-dioxaborine

Федоренко

Буквецкий

Мирочник

et al. 2010

Journal of Luminescence

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“…It can be assumed that these centers are weakly bound associates of chromophoric groups. Excitation of them produces a new emission at longer wavelength [21]. Then it was found that the solution fluorescence spectrum of the oligomer excited by light with λ = 260-300 nm was similar to that of TDB (Fig.…”

mentioning

confidence: 96%

Analysis of branched oligophenylene by absorption and fluorescence spectra

et al. 2011

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A branched oligophenylene has been synthesized based on 1,3,5-tri(4′-bromophenyl)benzene. Absorption and fluorescence spectra were studied and fluorescence quantum yields and lifetimes were measured for the compound in solution. It is demonstrated that the absorption spectrum is a superposition of p-quaterphenyl, p-terphenyl, and biphenyl chromophore absorption bands in a 1:2:1 ratio. The oligomer fluorescence spectrum is found to depend on the excitation wavelength. It is shown that the oligomer fluorescence is determined by two fluorochromic groups, namely fragments with branched p-terphenyl and p-quaterphenyl units. The main fluorescence maxima for these fluorochromic groups coincide with each other and lie in the vicinity of λ = 360 nm. A very weak fluorescence band found in the region 380-440 nm is excited by light with a wavelength lying beyond the oligomer self-absorption region. The reasons for a decrease in fluorescence quantum yields of branched models and the studied oligophenylene as compared with those of linear p-polyphenylene chromophores are discussed.Introduction. Branched oligomers have become very interesting in the last decade in connection with the search for novel materials with combinations of practically useful properties [1-3]. A promising area for application of branched oligomers containing luminophores is the development of new active additives to plastic scintillators [4], dye lasers [5,6], and light-emitting diodes in semiconducting photodiodes [7][8][9]. The preparation of branched oligomers and polymers with luminophores is a relatively new area. Comparatively few systems of this type have been prepared. Furthermore, their photophysical properties and their property-structure relationships are almost uninvestigated. One of the reasons for this situation is the difficulty of determining their molecular structures because the process for forming branched oligomers is random in nature [10,11].Herein a synthesized branched polymer (the Experimental section describes the synthetic method) is analyzed using spectrophotometry and fluorescence. According to the putative reaction, the produced macromolecule should have p-quaterphenyl (PQP) units at the branches and diphenyl (DP) and p-terphenyl (PTP) chromophores as the terminal groups. Issues with the determination of the ratio of these three chromophores in the produced macromolecule are examined. The units responsible for the fluorescence of the oligomer and the interactions between them are identified. These problems are resolved using a comparison of spectral data for the oligophenylene and the model low-molecularweight compounds PTP, PQP, and their branched analogs containing three PTP and PQP moieties.Experimental. The monomer 1,3,5-tri(4′-bromophenyl)benzene was prepared via the trimerization of 4-bromoacetophenone in benzene in the presence of triethylorthoformate and dry gaseous HCl by the standard method [12]. The oligophenylene was produced by Ni-catalyzed polycondensation of 1,3,5-tri(4′-bromophenyl)benzene by the literature me...

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Excimers of organic molecules

Cited by 65 publications

References 179 publications

Delayed Excimer Fluorescence of Fluoranthene Due to Triplet-Triplet Annihilation: Systematic Study of the Fluorescence from a Weakly Bound Excimer

Delayed Excimer Fluorescence of Fluoranthene Due to Triplet-Triplet Annihilation: Systematic Study of the Fluorescence from a Weakly Bound Excimer

Luminescence and crystal structure of 2,2-difluoro-4-(9-anthracyl)-6-methyl-1,3,2-dioxaborine

Analysis of branched oligophenylene by absorption and fluorescence spectra

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