Photophysics properties

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... 

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 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. 

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. 

Fullerenes possess electronic and photophysical properties which make them natural candidates for the preparation of functional dendrimers. The attachment of a controlled number of dendrons on a core provides a compact insulating layer around the carbon sphere, and the... 

Keywords. Dendrimers, Fullerenes, Optical limitation. Photophysical properties, Thin films... 

The photophysical properties of 1-8 have been studied in different solvents (PhMe, CH2CI2, and CH3CN). The lifetimes of the lowest triplet excited states are summarized in Table 1. 

More recently, we have succeeded in the preparation of the next generation compound 15 (Fig. 7) for which the molar absorptivity is approximately 450,000 M cm b The photophysical properties of 15 have not been yet investi-... 

In a recent study, poly(aryl ether) dendritic branches terminated with triethyleneglycol chains were attached to Cgg [66] dendrimer 32 represents the fourth generation. The photophysical properties of these fullerodendrimers have been systematically investigated in three solvents, namely toluene, dichloromethane, and acetonitrile. On increasing dendrimer generation, it has been found that in each solvent (i) the maximum of the fullerene fluorescence band is red-shifted... 

Dendritic hosts can be used in aqueous solution to encapsulate water-soluble fluorescent probes. Changes in the photophysical properties of these encapsulated probes are useful to understand the properties of the microenvironment created by the dendritic interior. For example, adamantyl-terminated poly(pro-pylene amine) dendrimers from the first to the fifth generation (36 represents the third generation) can be dissolved in water at pH<7 in the presence of -cyclodextrin because of encapsulation of the hydrophobic adamantyl residue inside the /1-cyclodextrin cavity and the presence of protonated tertiary amine units inside the dendrimer [72]. Under these experimental conditions, 8-anifi-... 

PBE dendrons bearing a focal bipyridine moiety have been demonstrated to coordinate to Ru + cations, exhibiting luminescence from the metal cation core by the excitation of the dendron subunits [28-30]. The terminal peripheral unit was examined (e.g., phenyl, naphthyl, 4-f-butylphenyl) to control the luminescence. The Ru +-cored dendrimer complexes are thought to be photo/redox-active, and photophysical properties, electrochemical behavior, and excited-state electron-transfer reactions are reported. 

Khopde, S.M. et ah. Effect of solveut ou the excited-state photophysical properties of curcumin, Photochem. Photobiol., 72, 625, 2000. 

The validity of the above conclusions rests on the reliability of theoretical predictions on excited state barriers as low as 1-2 kcal mol . Of course, this required as accurate an experimental check as possible with reference to both the solvent viscosity effects, completely disregarded by theory, and the dielectric solvent effects. As for the photoisomerization dynamics, the needed information was derived from measurements of fluorescence lifetimes (x) and quantum yields (dielectric constant, where extensive formation of ion pairs may occur [60], the observed photophysical properties are confidently referable to the unperturbed BMPC cation. Figure 6 shows the temperature dependence of the... 

When the reaction of [AujCgFsjjtht)] is carried out with C6F4NCSPPh2 the complex [56] shovm in Figure 3.5 was obtained and its structure was determined by X-ray diffraction. The benzothiazole ligands are known to display photophysical properties vdth an improvement of the photostability and emission intensity in conjugated systems as well as in the complexes that contain them, and the presence of... 

Fernandez, E.J., Laguna, A., Lopez-de-Luzuriaga, J.M., Monge, M., Montiel, M., Olmos, M.E. and Rodriguez-Castillo, M. (2006) Synthesis, coordination to Au(I) and photophysical properties of a novel polyfiuorinated benzothiazolephosphine ligand. Dalton Transactions, (30), 3672-3677. 

The discriminatory emission properties between two-coordinate d ° gold(I) complexes and their respective three-coordinate counterparts have been demonstrated in the literature [6, 10-13]. As discussed in the later sections, Che and coworkers have rationalized that the extraordinarily large Stokes shift of the visible emission of [Au2(diphosphine)2] from the [5da 6pa] transition is due to the exciplex formation ofthe excited state with solvent or counterions [6]. Fackler [14—16] reported the photophysical properties of monomeric [AUL3] complexes, which show visible luminescence with large Stokes shifts (typically lOOOOcm ), suggesting significant excited-state distortion. Gray et al. [10] examined the spectroscopic properties of... 

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