Materials photoinduced electron transfer

The scientists from Hong Kong reported83 on a sol-gel derived molecular imprinted polymers (MIPs) based luminescent sensing material that made use of a photoinduced electron transfer (PET) mechanism for a sensing of a non-fluorescent herbicide - 2,4-dichlorophenoxyacetic acid. A new organosilane, 3 - [N,V-bis(9-anthrylmethyl)amino]propyltriethoxysilane, was synthesized and use as the PET sensor monomer. The sensing MIPs material was fabricated by a conventional sol-gel process. 

The chapters in this Supplement F2 generally contain references up to the middle of 1995. Of the planned contents of this book, only three chapters failed to materialize. These were on NQR and ESR, on pyrolysis, and on photoinduced electron transfer reactions. I hope that these missing subjects will be dealt with in a later forthcoming supplementary volume of the series. 

Figure 3.32. Energy level scheme of the device in Figure 3.31. Photoinduced electron transfer takes place from the photoexcited ruthenium dye into the Ti02 conduction band. The recombination directly back to the dye has to be suppressed. Instead, the current is directed through the circuit to the counterelectrode and the hole conductor that brings the electrons back via hopping transport. HTM hole transport material.

Since most organic compounds, in particular n acceptors, have small reorganization energies, the change of redox potentials by the interaction of the corresponding radical anions with M may be the main factor to accelerate the rates of photoinduced electron transfer. Thus, any material M that can stabilize the radical anions by complexation may act as an efficient... 

Appleton B, Gibson TD. Detection of total sugar concentration using photoinduced electron transfer materials development of operationally stable, reusable optical sensors. 

X-ray analysis reveals a sandwich structure for these semi-conducting materials of formula [M(dmb)2]TCNQ TCNQ° (N= 1, 1.5), the polymeric chains of M(dmb)2 + are separated by layers of TCNQ- and neutral TCNQ (i.e., mixed-valence TCNQ- layers). The latter layer is responsible for the conductivity. Since TCNQ is an electron acceptor, electron transfer from the polymer to the mixed valence TCNQ layer is also possible from the Cu(I) center to the TCNQ- TCNQ° layer. This photoinduced electron transfer from... 

Novel hybrid materials have been realized in which fullerenes participate in composite films with 7r-conjugated-polymer electron donors such as oligothio-phenes. Established studies have already shown that the photoinduced electron transfer is rather enhanced between 7r-conjugated polymers and fullerenes, while back electron transfer is considerably slower [145,149,171,172].Electrosynthe-sized polythiophene with pendant fullerene substituents was recently obtained from the corresponding biothiophene-fulleropyrrolidine dyad [173]. The novel material described has the potential of a double-cable polymer, heavily loaded with fullerene electron-conducting moieties. 

In principle, thermal and photoinduced electron transfers should exhibit the same dependencies on bridge nature and length, as well as electrode materials. Many of the studies on electrochemically stimulated heterogeneous electron transfers on... 

Molecular Recognition and Chemistry in Restricted Reaction Spaces. Photophysics and Photoinduced Electron Transfer on the Surfaces of Micelles, Dendrimers and DNA [N. J. Turro, J. K. Barton, D. A. Tomalia, Acc. Chem. Res. 1991, 24, 332], Self-Assembly in Synthetic Routes to Molecular Devices. Biological Principles and Chemical Perspectives A Review [J. S. Lindsey, New J. Chem. 1991,15, 153], Amorphous molecular materials synthesis and properties of a novel starburst molecule, 4,4, 4 -tri(N-phenothiazinyl)triphenylamine [A. Higuchi, H. Inada, T. Kobata, Y. Shirota, Adv. Mat. (Weinheim, Ger.) 1991, 3(11), 549-550],... 

Photochemical behaviour of coordination compounds described in previous chapters results mainly from electronic interactions between the central metal atom or ion and ligands in the hrst coordination sphere. An increased size of molecular systems to clusters and nanosized crystals expands the possibility of photoinduced electron transfer between the discrete electronic states to excitation within bands. Furthermore, interactions of nanoparticles with molecules yield unique materials, combining structural versatility of molecular species with collective properties of solids. 

Wasielewski s research interests comprise photoinduced electron transfer and charge transport in organic molecules and materials, artificial and natural photosynthesis, self-assembly of nanoscale materials, spin dynamics of multispin organic molecules, materials for molecule-based optoelectronics and spintronics, and time-resolved optical and magnetic resonance spectroscopy. His research has resulted in over 300 publications. Dr. Wasielewski was elected a fellow of the American Association for the Advancement of Science in 1995, and has held numerous distinguished lectureships and fellowships. Among Wasielewski s recent awards are the 2004 Photochemistry Research Award of the Inter-American Photochemical Society and the 2006 James Flack Norris Award in Physical Organic Chemistry of the American Chemical Society. 

Hi h-performance optical materials 1-d Nonlinear optical phenomena Photoinduced electron transfer Photovoltaic devices Tunable NLO properties... 

Coinitiators according to route A are electron-deficient materials. Representative examples are onium compounds and triazines [269, 563], The free energy of photoinduced electron transfer (AGei) between a photosensitizer and a coinitiator is described by Eq. (64), in which /i, /2 is the half-wave oxidation potential (route A e J2 is representative for the sensitizer route B Fox" stands for the coinitiator), is the half-wave reduction potential (route A red is representative for the coinitiator route B stands for the sensitizer), and oo is the... 

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