Three different kinds of mixed self-assembled monolayers have been prepared to mimic photosynthetic energy and electron transfer on a gold surface. Pyrene boron-dipyrrin were chosen as light-harvesting model. The pyrene (or boron-dipyrrin) porphyrin (energy acceptor model) reveal photoinduced singlet-singlet from the has also combined with reaction center model, ferrocene-porphyrin-fullerene triad, construct integrated artificial assemblies electrode using respective unit. established...

A systematic series of ITO electrodes modified chemically with self-assembled monolayers (SAMs) porphyrins and porphyrin−fullerene dyads have been designed to provide valuable insight into the development artificial photosynthetic devices. First gold SAMs a spacer same number atoms were prepared compare effects energy transfer (EN) quenching porphyrin excited singlet states by two electrodes. Less EN was observed on electrode as compared corresponding electrode, leading remarkable...

Self-assembled monolayers of ferrocene−porphyrin−C60 triads on gold electrodes were prepared to mimic photosynthetic electron transfer events where efficient conversion light chemical energy takes place via the long-lived, charge-separated state with a high quantum yield. Adsorbed amounts electrodes, estimated from charge anodic peak ferrocene, are comparable those well-ordered porphyrin−alkanethiols and C60−alkanethiols electrodes. The results, together blocking experiments using redox...

Up to 14 porphyrin rings are present in the title compounds 1, which readily available with high regioselectivity from linear nickel–zinc porphyrins. Upon irradiation light a rapid energy transfer peripheral diporphyrin core takes place.

Intramolecularly hydrogen-bonded organic compounds often exhibit fluorescence emission at considerably longer wavelengths than typical as a result of excited-state intramolecular proton transfer (ESIPT). The structure-property relationship such ESIPT molecules, however, remains obscure. present article reports the dynamics new family 2-(2'-hydroxynaphthyl)benzazoles 1-3, based on steady-state and time-resolved spectroscopy measurements. In comparison with parent compound HBO, all three 1-3...

Disulfides, with a systematic series of alkyl spacers containing porphyrins at both terminals, were prepared to investigate the effect spacer length on structure and photoelectrochemical properties self-assembled monolayers (SAMs) gold electrode. The SAMs was studied using ultraviolet (UV)−visible absorption spectroscopy in transmission mode, cyclic voltammetry, UV−visible ellipsometry, fluorescence spectroscopy. These measurements showed that as increases, tend form highly ordered...

The laser fluorescence excitation spectra and single vibronic level have been measured for jet-cooled tropolone (–OH) (–OD). ν′11(a1), ν12(a1), ν′19(a2), modes newly identified in the spectrum of (–OH), addition to previously observed ν13(a1), ν′14(a1), ν25(b1), ν′26(b1) modes. tunneling doublet splittings these à 1B2 state determined investigate effect vibrational on proton dynamics. splitting is highly mode specific. ν13(a1) ν′14(a1) skeletal deformation are strongly coupled transfer...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT1,2-Phenylene-bridged diporphyrin linked with porphyrin monomer and pyromellitimide as a model for photosynthetic reaction center: synthesis photoinduced charge separationAtsuhiro Osuka, Satoshi Nakajima, Kazuhiro Maruyama, Noboru Mataga, Tsuyoshi Asahi, Iwao Yamazaki, Yoshinobu Nishimura, Takeshi Ohno, Koichi NozakiCite this: J. Am. Chem. Soc. 1993, 115, 11, 4577–4589Publication Date (Print):June 1, 1993Publication History Published online1 May...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Intramolecular Electron- Energy-Transfer Reactions of Polyyne- or Polyene-Bridged DiporphyrinsAtsuhiro Osuka, Nobuhiro Tanabe, Shigeki Kawabata, Iwao Yamazaki, Yoshinobu NishimuraCite this: J. Org. Chem. 1995, 60, 22, 7177–7185Publication Date (Print):November 1, 1995Publication History Published online1 May 2002Published inissue 1 November 1995https://doi.org/10.1021/jo00127a024RIGHTS & PERMISSIONSArticle...

The synthesis and excited-state dynamics are described for zinc-methylenechlorin−porphyrin−pyromellitimide triads, ZC−HP−I ZC−ZP−I, related dyads ZC−HP, ZC−ZP, HP−I, ZP−I, where ZC, HP, ZP, I indicate a zinc-methylenechlorin, free-base porphyrin, zinc-porphyrin, pyromellitimide, respectively. In the steady-state fluorescence spectra of ZC−HP−I, only emission from ZC is commonly observed, indicating efficient intramolecular singlet−singlet excitation energy transfer HP or ZP to ZC. undergoes...

Three-dimensional porphyrin-monolayer-protected gold clusters with different chain lengths (MPCs) have been prepared to examine the structure and photophysical properties, in comparison self-assembled monolayers (SAMs) of porphyrins on a flat surface. The three-dimensional porphyrin MPCs exhibit electrochemical properties that are much closer those reference compound solution than two-dimensional SAMs architectures large surface area improved light-harvesting efficiency relative...

Abstract A pincer Pt(II) complex with amide groups was investigated respect to the change in their luminescence color solid state. The exhibited mechanochromic behavior, changing from green orange upon grinding. In addition, changed yellow via vapochromism.

The dynamics of photosensitized singlet oxygen generation in a DNA microenvironment were examined using the DNA-binding photosensitizers berberine and palmatine. These generate only under interaction with because excited state deactivates rapidly nonbinding environment. A kinetic study demonstrated reaction process whereby is generated through energy transfer from triplet (or palmatine) to molecular oxygen. guanine-containing sequence slightly deactivated photosensitizers, resulting decrease...

The receptor tyrosine kinase epidermal growth factor (EGFR) and its ligand (EGF) are known to play important roles in malignant tumor cells, the EGFR signaling pathway is one of most targets various tumors, including non-small cell lung cancer (NSCLC). We reported recently that an aberration certain steps EGF-stimulated phosphorylated (pEGFR) endocytic trafficking from early endosomes late occurs gefitinib-resistant NSCLC which large amounts sorting nexin 1 (SNX1) colocalized with aggregated...

The architecture of windmill hexameric zinc(II) -porphyrin array 1 is attractive as a light-harvesting functional unit in view its three-dimensionally extended geometry that favorable for large cross-section incident light well suitable energy gradient from the peripheral porphyrins to meso-meso-linked diporphyrin core. Three core-modified porphyrin arrays 2-4 were prepared purpose enhancing intramolecular energy-transfer rate and coupling these with charge-separation unit....

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational mode-specific tunneling splittings in the A states of deuterated tropolonesHiroshi Sekiya, Yusuke Nagashima, Takeshi Tsuji, Yukio Nishimura, Akira Mori, and Hitoshi TakeshitaCite this: J. Phys. Chem. 1991, 95, 25, 10311–10317Publication Date (Print):December 1, 1991Publication History Published online1 May 2002Published inissue 1 December 1991https://doi.org/10.1021/j100178a015RIGHTS & PERMISSIONSArticle...

Advanced integrated circuits require eight or more levels of wiring to transmit electrical signal and power among devices external circuitry. Each level connects the above below it through via layers. The dual damascene approach fabricating these interconnected structures creates a simultaneously, thereby reducing total number processing steps. However, strategy (of which there are several variations) still requires around 20 process steps per layer. In this work, an that is based on...

Systematic series of indium tin oxide (ITO) electrodes modified covalently with self-assembled monolayers (SAMs) ferrocene-porphyrin-fullerene triads and porphyrin-fullerene dyads were designed to gain valuable insight into the development molecular photovoltaic devices. The structures SAMs on ITO have been investigated by UV/Vis absorption spectroscopy, atomic force microscopy, cyclic voltammetry. photoelectrochemical photophysical (fluorescence lifetime time-resolved transient absorption)...