Multiplet structure of the emission bands of coronene and perylene in n-heptane single crystal

Lamotte, Michel; Merle, A. M.; Joussot‐Dubien, Jacques; Dupuy, François

doi:10.1016/0009-2614(75)85632-6

Cited by 44 publications

(8 citation statements)

References 13 publications

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“…However, as a direct result of its unique disk-like planar symmetry (D6h), the in-plane principal transition probabilities are equal (Jablonski, 1950;Zimmerman and Joop, 1961) and thus are averaged over the plane of the molecule (Michl and Thulstrup, 1986). As a consequence, in-plane rotational motions are not possible to detect in the fluorescence polarizaton experiment, and consequently only out-of-plane motions will be observed, as discussed previously for coronene dispersed in long-chain alkane matrices (Lamotte and Joussot-Dubien, 1974;Lamotte et al, 1975). This results in a limiting anisotropy value of rO = 0.1.…”

Section: Introductionmentioning

confidence: 92%

“…2). Vibrational peaks were relatively insensitive to temperature effects, change in the lipid phase, or lipid type, although some thermal quenching (see below) was observed with increasing temperature (Lamotte et al, 1975). Because the fluorescence emissions of coronene are exquisitely sensitive to the presence of oxygen, the thermally associated intensity quenching might be attributed to altered membrane oxygen concentration; the solubility of dissolved oxygen in the membrane is decreased with increasing temperature (Husain et al, 1982;Tan and Ramsey, 1993).…”

Section: Steady-state Fluorescence Studiesmentioning

confidence: 99%

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Submicrosecond phospholipid dynamics using a long-lived fluorescence emission anisotropy probe

Davenport¹,

Targowski²

1996

Biophysical Journal

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The use of the long-lived fluorescence probe coronene (mean value of tau(FL) approximately 200 ns) is described for investigating submicrosecond lipid dynamics in DPPC model bilayer systems occurring below the lipid phase transition. Time-resolved fluorescence emission anisotropy decay profiles, measures as a function of increasing temperature toward the lipid-phase transition temperature (T(C)), for coronene-labeled DPPC small unilamellar vesicles (SUVs), are best described in most cases by three rotational decay components (phi(i = 3)). We have interpreted these data using two dynamic lipid bilayer models. In the first, a compartmental model, the long correlation time (phi(N)) is assigned to immobilized coronene molecules located in "gel-like" or highly ordered lipid phases (S-->1) of the bilayer, whereas a second fast rotational time (phi(F) approximately 2-5 ns) is associated with probes residing in more "fluid-like" regions (with corresponding lower ordering, S-->0). Interests here have focused on the origins of an intermediate correlation time (50-100 ns), the associated amplitude (beta(G)) of which increases with increasing temperature. Such behavior suggests a changing rotational environment surrounding the coronene molecules, arising from fluidization of gel lipid. The observed effective correlation time (phi(EFF)) thus reflects a discrete gel-fluid lipid exchange rate (k(FG)). A refinement of the compartmental model invokes a distribution of gel-fluid exchange rates (d(S,T)) corresponding to a distribution of lipid order parameters and is based on an adapted Landau expression for describing "gated" packing fluctuations. A total of seven parameters (five thermodynamic quantities, defined by the free energy versus temperature expansion; one gating parameter (gamma) defining a cooperative "melting" requirement; one limiting diffusion rate (or frequency factor: d(infinity))) suffice to predict complete anisotropy decay curves measured for coronene at several temperatures below the phospholipid T(C). The thermodynamic quantities are associated with the particular lipid of interest (in this case DPPC) and have been determined previously from ultrasound studies, thus representing fixed constants. Hence resolved variables are r(O), temperature-dependent gate parameters (gamma), and limiting diffusion rates (d(infinity)). This alternative distribution model is attractive because it provides a general probe-independent expression for distributed lipid fluctuation-induced probe rotational rates occurring within bilayer membranes below the phospholipid phase transition on the submicrosecond time scale.

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Section: Introductionmentioning

confidence: 92%

Section: Steady-state Fluorescence Studiesmentioning

confidence: 99%

Submicrosecond phospholipid dynamics using a long-lived fluorescence emission anisotropy probe

Davenport¹,

Targowski²

1996

Biophysical Journal

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“…13,21 Several authors compared the spectra of samples obtained with different cooling rates. [22][23][24] With faster cooling, the complexity of the multiplet structure increases. Obviously, the spectral properties of shock-frozen n-alkane solutions can only partly be understood on the basis of single-crystal studies.…”

Section: Introductionmentioning

confidence: 99%

Single molecules as nanoprobes. A study of the Shpol’skii effect

Matsushita

Bloeß

Durand

et al. 2002

The Journal of Chemical Physics

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Low temperature single molecule spectroscopy using vibronic excitation and dispersed fluorescence detection The Shpol'skii system perylene in n-hexane: A computational study of inclusion sites Inhomogeneous and single molecule line broadening of terrylene in a series of crystalline n -alkanes J. Chem. Phys. 106, 8324 (1997); 10.1063/1.473895 Shpol'skii effect and vibronic spectra of the phthalocyaninesWe present a comparative study, down to the single-molecule level, of the linewidth and multiplet structure of the optical transitions of 2.3,8.9-dibenzanthanthrene ͑DBATT͒ in shock-frozen solutions of n-decane, n-undecane, and n-tetradecane. The n-alkane matrices show weak structural ordering and distinct incorporations of the DBATT molecules have been recognized. The order does not increase, nor does the ensemble optical linewidth decrease going from bulk to sub-volumes of less than 1 m 3 . The relation between lateral position, orientation of the transition moment, and transition frequency has been investigated using single-molecule fluorescence-excitation and polarization spectroscopy. The distribution of the orientation is found not to depend on frequency and vice versa. Structural ordering on a microscopic scale is found not to be decisive as regards the linewidth and multiplet structure.

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“…Спектры этих центров идентичны, но немного смещены по шкале длин волн. Поляризация люминесценции компонентов мультиплетов отличается друг от друга, что указывает на различную ориентацию примесных молекул, ответственных за эти центры, в кристалле [6][7][8]. Этот механизм образования мультиплетов также подтверждают влияние скорости замораживания раствора [9] и спектрального состава возбуждающего света [10] на распределение интенсивности между компонентами мультиплета.…”

Section: Introductionunclassified

Влияние Тяжелых Атомов На Компоненты Дублета Спектра Фосфоресценции Трифенилена В Четыреххлористом Углероде

Дерябин¹,

Erina²,

Валюхов³

2021

Оптика И Спектроскопия

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Исследованы распределение интенсивности и кинетика компонентов дублета спектра фосфоресценции трифенилена в замороженном растворе четыреххлористого углерода. Установлена различная зависимость влияния тяжелых атомов (хлора) от ориентации молекул трифенилена в кристаллической решетке четыреххлористого углерода для запрещенных по спину и запрещенных по симметрии переходов. Ключевые слова: трифенилен, четыреххлористый углерод, спектр фосфоресценции, мультиплеты, тяжелые атомы.

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Multiplet structure of the emission bands of coronene and perylene in n-heptane single crystal

Cited by 44 publications

References 13 publications

Submicrosecond phospholipid dynamics using a long-lived fluorescence emission anisotropy probe

Submicrosecond phospholipid dynamics using a long-lived fluorescence emission anisotropy probe

Single molecules as nanoprobes. A study of the Shpol’skii effect

Влияние Тяжелых Атомов На Компоненты Дублета Спектра Фосфоресценции Трифенилена В Четыреххлористом Углероде

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