Luminescence, chemical-triggered

The resulting "dark" luminescence, can be measured with the simple experimental set-up previously described (15). A typical recording of chemical triggered luminescence is shown in Figure 2. 

Fig. 4.8.4 Effect of pH on the light intensity of the Ca2+-triggered luminescence of mnemiopsin-1 (o), mnemiopsin-2 ( ), and berovin (A). From Ward and Seliger, 1974b, with permission from the American Chemical Society.

Figure 3.77. Two-channel mechanism of chemically initiated luminescence triggered from a spiroadamantyl-substituted dioxetane (from Ref. 228). Here we discuss only the right branch (CIEEL channel) of the reaction 2 - 5 - 4 hv.

Figure 16.4 Principle of the PCT (photoinduced charge transfer), chemically driven, luminescent molecular sensor based on the donor-spacer-acceptor architecture, (a) Binding of analyte trigger to the donor (green) moiety results in hypsochromic shift of absorption (emission) band (b) binding of the same analyte to the acceptor moiety (red) results in bathochro-mic shift of corresponding transition...

Fig. 4.2.1 Luminescence spectra of the Ca2+-triggered light emission of recombinant obelins (dotted lines), and the fluorescence emission spectra of their spent solution after luminescence (solid lines). Left obelin derived from O. geniculata right obelin derived from O. longissima. Reproduced from Markova etal., 2002, with permission from the American Chemical Society.

Fig. 37 (a) QD-based sensing of cocaine by the formation of a cocaine-aptamer supramolecular structure that triggers FRET and (b) time-dependent luminescence spectra of the system in the presence of cocaine. The inset shows a calibration curve for variable concentrations of cocaine and a fixed so observation time of 15 min. (c) Schematic of the FRET-based TNT sensor and (d) increase of the QD luminescence upon addition of TNT in the competitive assay format. (Reprinted with permission from [220, 221], Copyright 2009 Royal Society of Chemistry and 2005 American Chemical Society)... 

Adam W, Bronstein I, Trofimov AV, VasiTev RE. Solvent-cage effect (viscosity dependence) as a diagnostic probe for the mechanism of the intramolecular chemically initiated electron-exchange luminescence (CIEEL) triggered from a spiroadamantyl-substituted dioxetane. J Am Chem Soc 1999 121 958-61. 

This was further elaborated upon by Schuster and co-workers (K21, S23, S24) and by Schaap s group at Wayne State University (S6, S8, SIO, Sll, Z2, Z3). Thus, the observation that some hydroxy-substituted aromatic dioxetanes show high chemiluminescent efficiencies at alkaline pH (phenolic anionic form) led to the formulation of a third mechanism for chemiluminescent decomposition of dioxetanes. This mechanism, known initially as intramolecular electron transfer (Ml9, Z2) and subsequently as chemically initiated electron exchange luminescence, or CIEEL (FI, K20), can be best illustrated by reference to the dioxetane shown in Fig. 37, where the chemiluminescence is triggered by the addition of fluoride ions. 

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