An adamantane-linked tetracene dyad (Tc-Ad-Tc) undergoes exergonic intramolecular singlet fission (SF), producing long-lived (τ = 175 μs) and high-energy (2 × 1.03 eV) multiexciton. Time-resolved absorption, fluorescence decay, electron paramagnetic resonance (EPR) spectroscopic analysis revealed that the triplet species is generated in this system via a correlated pair having quintet characteristics. EPR formation of syn anti conformers quintet, i.e., 5(3Tc-Ad-3Tc)*. The generation requires...

A series of liquid crystals have been synthesized and studied based upon mononuclear ortho-platinated rod-like heteroaromatic 1,3-diketonate ligands. The crystalline properties these molecules were investigated using polarized light optical microscopy, differential scanning calorimetry, single crystal X-ray diffraction, powder diffraction. Increasing the number alkyl chains attached to units resulted in a transition from lamellar (SmA) hexagonal columnar phases (Colh). 2-thienylpyridine...

A novel class of near-infrared absorbing squarylium sensitizers with linearly extended π-conjugated structures, which were obtained by Pd-catalyzed cross-coupling reactions stannylcyclobutenediones, has been developed for dye-sensitized solar cells. The cells based on these dyes exhibited a significant spectral response in the region over 750 nm addition to visible region.

To clarify the ancillary ligand effect on excimer formation of heteroleptic cyclometalated platinum(II) complexes, we investigated photo- and electroluminescence behavior for green-phosphorescent [(dibenzo[b,d]furan-4-yl)pyridinato-N,C3′]platinum(II) 1,3-diketonates Pt-1 Pt-2 (1,3-diketonate ligands; 1,3-bis(3,4-dibutoxyphenyl)propane-1,3-dionate (bdbp) dipivaloylmethanate (dpm) Pt-2, respectively). The X-ray crystallographic study reveals that both form dimeric pairs in solid states,...

Diels-Alder photocycloaddition of 9-phenylethynylanthracene results in multiple [4 + 2] and 4] cycloaddition products solution, which can be controlled to form specific under a restricted environment. We have exploited the gel phase 9-phenylethynylanthracence derivative as confined medium specifically yield cycloadduct >90% yield. The photocycloadduct ( anti-form) exhibited blue emission with CIE chromaticity x = 0.16/ y 0.16. Construction an organic light emitting device photocycloadduct,...

Numerous fluorescent dye-based optical sensors have been developed to detect water in organic solvents. However, only a few such can polar solvents as methanol or dimethyl sulfoxide, and their detection range is generally narrow. Therefore, this study, copolymer membrane incorporated with pyridinium betaine dye (denoted PB1), which exhibited intramolecular charge transfer (ICT) characteristics, was realise simple The structure, comprising hydrogen bonds between the oxygen maleimide moiety...

Dendrimers are unique polymers with globular shapes and well-defined structures. We previously prepared poly(amidoamine) (PAMAM) dendrimers having phenylalanine (Phe) residues at every chain end of the dendrimer as efficient gene carriers. In this study, we found that Phe-derivatized PAMAM change their water solubility depending on temperature. The were soluble in aqueous solutions low temperatures, but they became water-insoluble temperatures above a specific threshold, which is termed...

Unsymmetrical squaraine dyes bearing pyrylium or thiopyrylium components were synthesized, and their light-absorbing properties performance as sensitizer in dye-sensitized solar cells investigated. Condensations of 2,6-di-tert-butyl-4-methylpyrylium salt with butyl squarate afforded corresponding semisquaryliums. The semisquaryliums reacted indolenium carboxyl group to give target unsymmetrical dyes. They exhibited intense absorption the far-red near-infrared region solution on TiO2 surface....

V-shaped squaraine dyes with carbazole cores in the center and indolenine groups at end were designed to broaden light-harvesting range of dye-sensitized solar cells (DSSCs) by taking advantage intramolecular exciton coupling. squaraines containing carboxy group on moiety 4-phenyl-2-cyanoacrylic acid as anchoring for chemical adsorption onto TiO2 synthesized utilization Stille cross-coupling a key reaction. Although conventional show typically narrow absorption bands, exhibited split bands...

The synthesis and optical properties of several phosphorescent conjugated poly(phenylene)s containing cyclometalated square-planar platinum (II) complexes are reported. These electronic polymers were synthesized via Suzuki cross-coupling a dibromophenylpyridine-ligated Pt(II) complex with fluorene diboronic ester. Their characterized by relatively strong orange room-temperature phosphorescence well-resolved vibronic structure in both frozen 2-methyltetrahydrofuran glass fluid solution....

A novel porphyrinic receptor 1 in which two zinc porphyrins are bridged by diarylurea linkers was developed for recognition of a viologen derivative (hexyl viologen, HV). The electronic absorption spectra as well the 1H NMR experiments revealed that HV molecule bound to cleft mainly through carbonyl dipole-charge interactions afford 1:1 complex. From steady-state fluorescence spectroscopic study, photoinduced electron transfer (PET) from extremely facilitated receptor−substrate complexation....

A symmetrical squaraine dye altered to possess dicyanovinylene functionality on a carbonyl group of the cyclobutene core (SQM1a) was synthesized elucidate effects conformationally locked-in cis-like form ensured by steric repulsion dicyanovinylenes performance dye-sensitized solar cells (DSSCs) through comparison with an unsymmetrical analogue bearing one carboxy (SQM1b) and standard (MSQ). The FT-IR spectrum TiO2 thin film immersed in solution suggested that linkages between were formed...

Squarylium dyes with linearly π-extended structures involving three cyclobutene cores and four heterocyclic components were designed as metal-free sensitizing that can enhance spectral responses in the range over 800 nm successfully synthesized through combination of Pd-catalyzed cross-coupling using stannylcyclobutenediones condensation reactions. The exhibited intense absorption NIR region maxima at around 850 onsets 950 nm. Although HOMO levels remained same corresponding standard...

Red-MCPEL could be emitted from an MCP-OLED containing achiral PtOEP under a 1.7-T EMF. The degree of light rotation and luminance this CP-OLED can amplified through the synergistic effects reflection reversal

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTInterconversion between Point Chirality and Helical Driven by Shape-Sensitive InteractionsTadashi Mizutani, Shigeyuki Yagi, Atsushi Honmaru, Hisanobu OgoshiView Author Information Department of Synthetic Chemistry Biological Faculty Engineering, Kyoto University Yoshida, Sakyo-ku, Kyoto, 606−01 Japan Cite this: J. Am. Chem. Soc. 1996, 118, 22, 5318–5319Publication Date (Web):June 5, 1996Publication History Received27 November 1995Published...

Abstract π‐Conjugated copolymers consisting of squaraine dyes as light‐harvesting components and phenylene linkers ( PSQ ) are presented. They show intense absorption in visible (Vis) near‐infrared (NIR) region, originating with the intramolecular charge transfer dye. Although their optical electrochemical properties dominantly derived from dye components, affect aggregation solid state phase segregation /PCBM composites. Bulk heterojunction solar cells exhibit spectral response Vis–NIR they...

Novel blue phosphorescent bis- and tris-cyclometalated iridium(<sc>iii</sc>) complexes with excellent PL quantum yields were developed, using fluorinated 2-(5-benzoylphenyl)pyridinate ligands.

Abstract The magnetic circularly polarized luminescence (MCPL) and photoluminescence (PL) spectra of achiral (2,3,7,8,12,13,17,18‐octaethylporphyrinato)platinum(II), PtOEP , [2‐(4′,6′‐difluorophenyl)pyridinato‐ N C 2′ ]platinum(II) acetylacetonate‐ O F 2 ‐ppyPt(acac) in toluene dichloromethane solutions were recorded under an external field 1.6 T with N‐up S‐up Faraday geometries. MCPL signs controlled solely by changing the MCPL/PL wavelengths varied ratio monomeric excimeric species.

Oxocarbon derivatives consisting of 4- and 5-membered rings, referred to as croconaine squaraine dyes regarded closed-shell molecules, are found have an intermediate open-shell character from the experimental results 1H-NMR, ESR spectroscopy, SQUID magnetometric analysis, X-ray crystallography. We employed two chalcogenopyrylium moieties with O S chalcogen atoms substitutions on oxocarbons. The singlet-triplet energy gaps (ΔES-T) associated degree diradical nature smaller for croconaines...