Luminescent switches

Extended linear chain inorganic compounds have special chemical and physical properties [60,61], This has led to new developments in fields such as supramolecular chemistry, acid-base chemistry, luminescent materials, and various optoelectronic applications. Among recent examples are the developments of a vapochromic light emitting diode from linear chain Pt(II)/Pd(II) complexes [62], a luminescent switch consisting of an Au(I) dithiocarbamate complex that possesses a luminescent linear... 

Mansour, M.A., Connick, W.B., Lachicotte, R.J., Gysling, H.J. and Eisenberg, R. (1998) Linear chain Au(I) dimer compounds as environmental sensors A luminescent switch for the detection of volatile organic... 

The anthraquinone exhibits a similar redox behavior as benzoquinone. Thus, redox luminescence switch can also be constructed with fluorophore linked to anthraquinone. For example, the luminescence of molecule 22, a ruthenium complex with an appended anthraquinone moiety, can be reversibly tuned through the interconversion between the anthraquinone and the corresponding hydroquinone.32... 

Fig. 2 Redox luminescence switching in trisbipyridyl metal complexes.

Interestingly, the photoisomerizing styrylpyridine and l,2-di(4-pyridyl)-ethylene (dpe) rhenium complexes behave as luminescence switches [123-125], This phenomenon originates in the different nature of the lowest excited state of the trans and cis isomers, TI.(F) and MLCT, respectively. Near-UV irradiation converts the nonemissive trans isomer to the cis form, which shows strong phosphorescence from its 3MLCT state. Emission can be switched off by UV (254 rnn) light that induces a reverse cis—>trans isomerization. 

Fig. 26. Pt(II) complex displaying reversible color and luminescence switching after exposure to MeOH vapor, as described by Eisenberg et al. Reproduced with the permission of the American Chemical Society 240).

Up-Conversion Luminescent Switch Based on the Combination of DTE and Rare-Earth Nanophosphors... 

Figure 33 Principle and confocal luminescence images of the up-conversion luminescent switch consisting of l/LaF3 Yb,Ho-loaded PMMA film. Before (left), and after (right) irradiation with 365 nm light for 30 min, A-ex = 980 nm. (Reproduced by permission of The Royal Society of Chemistry from Ref. 77. http //dx.doi.org/10.1039/B809021A)...

Li Q, Yam VWW (2007) Redox luminescence switch based on energy transfer in CeP04 Tb nanowtres. Angew Chem Int Ed 46 3556-3559... 

Tropiano M., N. L. Kilah, M. Morten, H. Rahman, J. J. Davis, P. D. Beer, S. Faulkner, Reversible Luminescence Switching of a Redox-Active Ferrocene-Europium Dyad. J. Am. Chem. Soc. 133,... 

In view of the ability to alter the luminescence properties of Au(I) complexes through a change in the Au- Au interactions, the design of luminescence switches or sensors employing aurophilic... 

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