The effect of sample environment on the room-temperature phosphorescence of several polynuclear aromatic hydrocarbons

Bower, Esther Lue-Yen; Winefordner, J. D.

doi:10.1016/s0003-2670(01)93456-7

Cited by 69 publications

(17 citation statements)

References 36 publications

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“…The heavy-atom effect is an invaluable aid to phosphorimetric analysis since it is able to enhance the triplet emission of weakly phosphorescent compounds. In the past, this effect has been applied to conventional low-temperature phosphorescence (15,16) and to RTP analyses (4,5,7,11,17,18) of individual compounds. In this study the usefulness of the external heavy-atom effect is extended to improve both sensitivity and selectivity of the phosphorescence analysis of complex mixtures.…”

mentioning

confidence: 99%

Selective heavy-atom perturbation for analysis of complex mixtures by room-temperature phosphorimetry

Vo‐Dinh¹,

Hooyman²

1979

Anal. Chem.

110

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The price paid for this decrease in analysis time is a modest increase in the total error of analysis.Zief and Mitchell (22), among others, have clearly stated the need for an analytical laboratory handling a diversity of analytical problems to have available highly accurate, in addition to fast (less accurate) analysis methods. Depending on the requirements of the analytical problem at hand, speed or accuracy may be of greater importance. We feel that the general method of slurry-injection atomic absorption, because it uses relatively inexpensive and widely available commercial instrumentation, is a viable analytical alternative when speed

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mentioning

confidence: 99%

Selective heavy-atom perturbation for analysis of complex mixtures by room-temperature phosphorimetry

Vo‐Dinh¹,

Hooyman²

1979

Anal. Chem.

110

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“…In group one, the resulting IÁ Á ÁC distances are 3.502, 3.596, 3.556, and 3.607 Å, with bonding angles of 168.8, 162.3, 172.6, and 160. 4 , respectively. In group two, the bonding distances are 3.411, 3.655, 3.613, 3.487, and 3.536 Å, with bonding angles of 170.…”

Section: Cocrystals By Fluorene and Its Heterocyclic Analogues And Hamentioning

confidence: 97%

“…The extrinsic heavy atom effect is a pure physically spin-orbital coupling occurring in a simple mixture of metal cations or iodide anions and organic molecules with uncertain stoichiometry in solution/vitreous media, on solid supports, or in cyclodextrin inclusion complexes of halogenated alkanes with organic molecule [3]. When metal ions coordinate luminescent organic ligands, the extrinsic heavy atom effect may become more efficient, e.g., when Ag(I) interacts with polyaromatic hydrocarbons by Ag-π complexation or Hg(II) with N-heterocyclic aromatic hydrocarbons by Hg-N bonding [4,5]. Metal ions can sometimes act as intrinsic or a special heavy atom effect between extrinsic and intrinsic by complexation or coordination with phosphor as chelator with exact stoichiometry, corresponding to directly or indirectly acting on a luminescent central group of organic molecules [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Halogen Bonding in the Design of Organic Phosphors

Pang

Jin

2014

Topics in Current Chemistry

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Halogen bonding as a new strategy for introducing heavy atom perturbers in defined stoichiometry in the design of organic phosphors is reviewed. Considering ten novel cocrystals assembled by polyaromatic hydrocarbons (PAHs) and their heterocyclic analogues and haloperfluorobenzenes using the new strategy, apart from biphenyl cocrystals they all phosphoresce strongly, showing that the new methodology can induce phosphorescence by a heavy atom effect. More interesting, the phosphorescence properties, including excitation/emission wavelengths and decay dynamics, show dependence on the structure of the PAHs and interaction patterns, which is very important and valuable in modulation of the expected colors of luminescent materials.

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“…The de is very low for silica gel, a surface lacking cations and decreased significantly on Before closing this section we like to point out that RTP has been observed on silica surfaces and papers impregnated with heavy metal salts such as thalium nitrate. [273][274][275][276] Thus the heavy cation and its proximity to the emitter are the key factors that lead to enhancement of phosphorescence and the confined container prevents quenching by oxygen and by itself (self-quenching; see below).…”

Section: Distinct Differences Exist Between the Rigidly Organized Strmentioning

confidence: 99%

Supramolecular photochemistry concepts highlighted with select examples

Ramamurthy

Mondal

2015

Journal of Photochemistry and Photobiology C: Photochemistry Re

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‗Supramolecular Photochemistry' (SP) deals with a study of the properties of molecules in their excited states where the medium plays a significant role. While ‗Molecular Photochemistry' (MP) deals with studies in isotropic solution, the SP deals with reactant molecules that interact weakly with their surroundings. The surroundings in general are highly organized assemblies such as crystals, liquid crystals, micelles, hostguest structures etc. The behavior of exited molecules in SP unlike in isotropic solution is controlled not only by their inherent electronic and steric properties but also by the immediate surroundings. The weak interactions that control the chemistry include van der Walls, hydrophobic, C-H-, - and several types of hydrogen bonds. In this review the uniqueness of SP compared to MP is highlighted with examples chosen from reactions in crystals, micelles and host-guest assemblies. In spite of distinctly different structures (crystals, micelles etc.) the influence of the medium could be understood on the basis of a model developed by G. M. J. Schmidt for photoreactions in crystals. The principles of reaction cavity model are briefly outlined in this review. There are a few important features that are specific to SP. For example, highly reactive molecules and intermediates could be stabilized in a confined environment; they enable phosphorescence to be observed at room temperature and favor chiral induction in photochemical reactions. Using such examples the uniqueness of SP is highlighted. The future of SP depends on developing efficient and unique catalytic photoreactions using easily available reaction ‗containers'. In addition, their value in artificial photosynthesis should be established for SP to occupy a center stage in the future.

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The effect of sample environment on the room-temperature phosphorescence of several polynuclear aromatic hydrocarbons

Cited by 69 publications

References 36 publications

Selective heavy-atom perturbation for analysis of complex mixtures by room-temperature phosphorimetry

Selective heavy-atom perturbation for analysis of complex mixtures by room-temperature phosphorimetry

Halogen Bonding in the Design of Organic Phosphors

Supramolecular photochemistry concepts highlighted with select examples

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