Photophysical property

Bis- and tris-polypyridine complexes of Ru are the best known and most useful photo-redox active coordination compounds. The possibility to vary the structure and number of polypyridine ligands and of the ancillary ligands in mono- and bis-polypyridine complexes gives rise to a virtually endless number of photoactive species and provides many opportunities for controlling their properties. Photophysical,... 

The present work Illustrates the wide range of phenomena that are exhibited by amphiphilic alternating copolymers. It remains to be seen how large a range of chromophores can be polymerized in this manner and what kind of solution properties - photophysical behavior relations will be found. 

Charge transport/optical properties, photophysics (electrical engineering, physics, materials science)... 

Guldi D M and Asmus K-D 1997 Photophysical properties of mono- and multiply-functionalized fullerene derivatives J. Phys. Chem. A 101 1472-81... 

Williams R M, Zwier J M and Verhoeven J W 1995 Photoinduced intramolecular electron transfer in a bridged Cgg (acceptor)-aniline (donor) system. Photophysical properties of the first active fullerene diad J. Am. Chem. See. 117 4093-9... 

Imahori H, Hagiwara K, Akiyama T, Taniguchi S, Okada T and Sakata Y 1995 Synthesis and photophysical property of porphyrin-linked fullerene Chem. Lett. 265-6... 

This section will outline the simplest models for the spectra of both metal and semiconductor nanocrystals. The work described here has illustrated that, in order to achieve quantitative agreement between theory and experiment, a more detailed view of the molecular character of clusters must be incoriDorated. The nature and bonding of the surface, in particular, is often of crucial importance in modelling nanocrystal optical properties. Wlrile this section addresses the linear optical properties of nanocrystals, both nonlinear optical properties and the photophysics of these systems are also of great interest. The reader is referred to the many excellent review articles for more in-depth discussions of these and other aspects of nanocrystal optical properties [147, 148, 149, 150, 151, 152, 153 and 1541. 

There have been approximately 60 references to thiazine dyes in the past 15 years of Chemical Jibstracts. Although most of these references are to titration indicators, photophysical evaluation, and spectral properties, a few refer to stmctures for use as dyes (13). 

Synthesis and photophysical properties of electro- and photoactive fulleropyr-rolidines 97G779. 

Unusual photophysical properties of polyazaanthracenes and polyazapentacenes having low values of calculated singlet-triplet energy gap 99PAC295. 

Photochemistry, photophysical properties and photosensitization of 7 were investigated (99MI37, 99MI42, 99MI64, 01MI23). Preparation and usage of nitrate salt of 7 were patented (01MIP14). 

The photochemistry of transition metal 1,3-diketone chelate complexes has been known for some time [30,31], and their photophysical and photochemical properties and photocatalytic activity in different chemical reactions were reviewed in 1990 by Marciniak and Buono—Core [32]. Further discussion on the photochemistry of meta] chelate will not take place here since this subject is out of the scope of this chapter. 

The reduced symmetry of the chromophore, which still contains 187t-electrons and is therefore an aromatic system, influences the electronic spectrum which shows a bathochromic shift and a higher molar extinction coefficient of the long-wavelength absorption bands compared to the porphyrin, so that the photophysical properties of the chlorins resulting from this structural alteration render them naturally suitable as pigments for photosynthesis and also make them of interest in medical applications, e.g. photodynamic tumor therapy (PDT).2... 

The photophysical properties of porphycenes make these structures potential sensitizers for an application in Photodynamic Tumor Therapy (PDT). To improve the photophysical properties and to modify possible biological activity it is necessary to have porphycenes with an extended chromophore and/or with additional functional groups for further modifications. The Diels-Alder reaction of a vinyl porphycene allows for the preparation of benzoporphycenes with an extended chromophore9 and additional functional groups (cf. Section 1.1.2.4.). 

C.A. Schalley and F. Vogtle (eds), Dendrimers Functional and Hyperbranched Building Blocks, Photophysical Properties, Applications in Materials and Life Sciences, Vol 5, Springer-Verlag GmbH, Berlin and Heidelberg, 2003. 

Yersin H, Donges D (2001) Low-Lying Electronic States and Photophysical Properties of Organometallic Pd(II) and Pt(II) Compounds. Modern Research Trends Presented in Detailed Case Studies. 214 81-186 Yeung LK, see Crooks RM (2001) 212 81-135... 

Table 4. Chemical structure and spectroscopical and photophysical properties of riboflavin (RF) in aqueous phosphate buffer pH 7.4 (Valle et al, 2011).

Valle, L. Moran Vieyra, F.E. Borsarelli, C.D. (2011). Microenvironmental modulation of photophysical properties of flavins. Submitted to Photophysical and Photochemical Sciences. 

As just mentioned, phosphorus porphyrins have unique photochemical properties. Their photophysics is also interesting. Emitter-quencher assemblies based on porphyrin building blocks have attracted attention due to their potential to serve as models in photosynthetic research (see [90] for an example) or for the development of photoswitches that could be used for the fabrication of molecular electronic/optical devices. In this context, Maiya and coworkers constructed a P(VI) porphyrin system 59b with two switchable azobenzene groups positioned in the apical positions of the pseudo-octahedral phosphorus atom [92]. Photoswitch ability (luminescence on/off) was demonstrated as... 

In a series of remarkable papers, K. Tamao and S. Yamaguchi have shown that the physical properties of triarylboranes and triarylsilanes can be modified using structural changes induced by increasing coordination numbers [74]. In the same way, the tuning of the photophysical properties of PAr3 systems (96-99) (Scheme 27) according to the coordination number of the P-atom has been achieved [75]. 

Hauser A, von Arx ME, Langford VS, Oetliker U, Kairouani S, Pillonnet A (2004) Photophysical Properties of Three-Dimensional Transition Metal Tris-Oxalate Network Structures. 241 65-96... 

Gygax R, Wirz J, Sprague JT, Allinger NL. Electronic structure and photophysical properties of planar conjugated hydrocarbons with a 4n-membered ring. Part III. Conjugative stabilization in an antiaromatic system The conformational mobility of l,5-bisdehydro[12]annulene. Helv Chim Acta 1977 60 2522-9. 

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