A bright combination: a new type of donor-acceptor dyad, carbazolylaryl-substituted ortho-carboranes, which are conveniently prepared from the corresponding acetylenes and decaborane pathways, showed unique excited-state behavior associated with electron transfer unlike meta- para-counterparts.

Hoop-shaped π-conjugated molecules such as cycloparaphenylene (CPP) have attracted the attention of many chemists because they exhibit interesting properties due to distorted π-electron system. To gain a systematic understanding that result from systems, it is important know precisely how these depend on hoop size. In present study, we investigated size dependence fluorescence CPPs. The spectra smaller CPPs showed red-shifted peaks, quantum yields, and longer lifetimes, when compared those...

We have explored the electronic natures of representative expanded porphyrins, [26]- and [28]hexaphyrins, to investigate interplay between aromaticity antiaromaticity that is brought by two electron oxidation/reduction processes. The excited singlet triplet states [26]hexaphyrin in solution exhibit lifetimes 125 ps 1.8 μs, respectively, as revealed various time-resolved spectroscopic measurements. On other hand, [28]hexaphyrin shows faster than those [26]hexaphyrin, which largely accordance...

The effects of α- and β-cyclodextrins (CDs) on the twisted intramolecular charge transfer (TICT) emission p-(N,N-diethylamino)benzoic acid (DEABA) in aqueous solution have been investigated by using steady-state time-resolved fluorescence techniques. ratio TICT to normal increases as β-CD concentration increases, while it decreases significantly upon addition α-CD. This behavior is accordance with CD dependent decay times emissions, indicating formation different 1:1 DEABA/CD inclusion...

Under the sun! A new low-molecular-weight and multiple-functional coadsorbent (HC-A) for highly efficient dye-sensitized solar cells has been developed. The NKX2677/HC-A-sensitized cell exhibited remarkably enhanced conversion efficiency by a factor of 1.33 compared to NKX2677 under standard test conditions. Detailed facts importance specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted...

Electron donor-acceptor (D-A) systems with a triphenylamino moiety (D) and ortho-carborane (A) show three kinds of intriguing emissions that can be attributed to the local excited state, intramolecular charge-transfer aggregation-induced emission state. The behaviors depend on which positions carborane are substituted.

Carborane-based donor-π-acceptor triads (D-π-A-π-D) bearing triarylamine moieties were synthesised. All the monomeric showed a blue-green emission in dilute solution, which was assigned as an intramolecular charge-transfer (CT) emission. The CT large Stokes shifts at higher solvent polarity. further shifted to longer wavelength with increase π-conjugation. Interestingly, strong red observed highly concentrated solutions or solid state, aggregation-induced (AIE). Moreover, AIE strongly...

1,8-Naphtalimdes showed aggregation induced emission in both extremely polar or nonpolar solvents, which is attributed to the intermolecular-excimer and intramolecular-exciplex formation.

Eine einleuchtende Verbindung: neue Klasse von Donor-Akzeptor- Systemen – Carbazolylaryl-substituierte ortho-Carborane wurde aus den entsprechenden Acetylenen und Decaboran hergestellt. Sie zeigen ein ungewöhnliches Verhalten der angeregten Zustände, indem sie, anders als die para- meta-Verbindungen, Elektronentransfers eingehen (siehe Bild). Detailed facts of importance to specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or...

On the basis of results frontier orbital considerations, 4-substituted-2′-pyridyltriazoles were designed to serve as ancillary ligands in 2-phenylpyridine main ligand containing heteroleptic iridium(III) complexes that display deep blue phosphorescence emission. The complexes, Ir1–Ir7, prepared using new ligands, found structured, highly quantum efficient (Φp = 0.20–0.42) with emission maxima 448–456 nm at room temperature. In accord predictions based on observed have properties are...

Clonorchis sinensis is currently the most important parasite affecting public health problems in Republic of Korea. We investigated prevalence C. infection among residents living along 5 major rivers A total 42,562 individual stool samples were collected from 37 localities and examined using formalin-ether sedimentation technique. Helminth eggs detected 4,052 (9.5%) 3,586 (8.4%) infected with sinensis. The egg positive rate Nakdong, Seomjin, Geum, Yeongsan, Han River was 11.7%, 9.9%, 6.5%,...

The influence of π-conjugation structural changes on photoinduced electron transfer (PET) and intramolecular charge (ICT) processes in π-conjugated donor (D)-acceptor (A) dyads (D-π-A) was investigated. Three types D-π-A were prepared through the modification structure their linker, including (1) D-πtw-A (2) having a twisted π-conjugation, D-π-Si-π-A (3) with severed by Si-atom. In these dyads, carbazole (Cz) oxadiazole (Oz) moieties act as an acceptor, respectively. emission maxima 1 3...

A series of cationic Ir(III) complexes ([Ir(btp)2(bpy-X2)]+ (Ir-X+: btp = (2-pyridyl)benzo[b]thiophen-3-yl; bpy-X2 4,4'-X2-2,2'-bipyridine (X OMe, tBu, Me, H, and CN)) were applied as visible-light photosensitizer to the CO2 reduction CO using a hybrid catalyst (TiO2/ReP) prepared by anchoring Re(4,4'-Y2-bpy)(CO)3Cl (ReP; Y CH2PO(OH)2) on TiO2 particles. Irradiation solution containing Ir-X+, TiO2/ReP particles, an electron donor (1,3-dimethyl-2-phenyl-1,3-dihydrobenzimidazole) in...

A fundamental understanding of hot electron transport is critical for developing efficient hot-carrier-based solar cells. There have been significant efforts to enhance flux, and it has found that a key factor affecting the flux lifetime electrons. Here, we report combined study carriers using perovskite-modified plasmonic nanodiode. We perovskite deposition on nanodiode can considerably improve generation induced by photon absorption. The consists MAPbI3 layers covering plasmonic-Au/TiO2...

Panchromatic 1,6-bis(N-phenyl-p-(R)-phenylamino)pyrenes, 2R, were obtained from Buchwald-Hartwig coupling reactions between N-phenyl-p-(R)-phenylamines and 1,6-dibromopyrene. The photophysical properties of 2R corresponded well to the electron-withdrawing -donating nature diarylamine substituents, exhibiting a full color visible range 454 620 nm. In particular, deep blue 2CN showed high radiative rate constant 2.85 x 10(8) s(-1) with emission quantum efficiency 79%. Further applications as...

Photoinduced processes of a series phosphorus tetraphenylporphyrin (PTPP) derivatives ([PTPP-(NHC6H4X)2]+Cl-, X = OCH3, CH3, H, Cl, CF3, and CN) have been investigated by using femtosecond laser flash photolysis mainly. PTPP with OH as an axial ligand showed S2 fluorescence upon excitation the Soret band. The lifetime was estimated to be 1.5 ps. On other hand, both S1 bands PTPP-(NHC6H4X)2 were difficult observe, indicating existence additional deactivation process such charge separation...

A series of dyes were synthesized to examine the roles hydrophilic characteristics R in sensitized hydrogen generation by dye-grafted Pt/TiO(2) under visible light irradiation. The hydrogen-generation efficiencies and optimum amounts grafted affected substantially steric effects R; moderately DEO1 DEO2 showed higher sensitization activity at a lower loading than hydrophobic D-H.

Improvement of the stability blue phosphorescent dopant material is one key factors for real application organic light-emitting diodes (OLEDs). In this study, we found that intramolecular hydrogen bonding in an ancillary ligand from a heteroleptic Ir(III) complex can play important role phosphorescence. To rationalize bonding, series complexes designed and prepared: Ir(dfppy)2(pic-OH) (1a), Ir(dfppy)2(pic-OMe) (1b), Ir(ppy)2(pic-OH) (2a), Ir(ppy)2(pic-OMe) (2b). The emission lifetime (1a)...

The adsorption mechanism for the N719 dye on a TiO2 electrode was examined by kinetic and diffusion models (pseudo-first order, pseudo-second intra-particle models). Among these methods, observed kinetics are well-described using order model. Moreover, film process main controlling step of adsorption, which analysed diffusion-based photodynamic properties in dye-sensitized solar cells (DSSCs) were investigated time-resolved transient absorption techniques. photodynamics oxidized species...

To gain new insights into ligand-to-ligand charge-transfer (LLCT) dynamics, we synthesised two heteroleptic Ir(3+) complexes: (Ir(dfppy)2(tpphz)) and (Ir(dfppy)2(dpq)), where dfppy, tpphz, dpq are 2-(4,6-difluorophenyl)pyridine, tetrapyrido[3,2-a:2',3'-c:3'',2''-h:2''',3'''-j]phenazine, 2,3-bis-(2-pyridyl)-quinoxaline, respectively. The tpphz ligands have longer π-conjugation than dfppy. Therefore, the excited ligand-centred (LC) state metal-to-ligand charge transfer (MLCT) of dfppy higher...

Photoinduced electron transfer (PET) processes of 1,8-naphthalimide-linker-phenothiazine (NI-L-PTZ) dyads have been investigated using the nanosecond- and picosecond-transient absorption measurements. Two kinds linker were introduced, i.e., polymethylene-linked dyad (NI-C8-PTZ NI-C11-PTZ) a poly(ethyl ether)-linked one (NI-O-PTZ). The 355 nm pulsed laser excitation NI-C8-PTZ, NI-C11-PTZ, NI-O-PTZ in acetonitrile produced NI radical anion (NI•-) PTZ cation (PTZ•+) with bands around 420 520...

Novel boron dipyrromethene (BODIPY) derivatives having significant absorption and emission in the longer wavelength region were synthesized. BODIPY showed anomalous S2 from second excited (S2) state at shorter wavelength. The photodynamics of was investigated by fluorescence up-conversion transient spectroscopic measurements. decay time dependent on internal conversion intersystem crossing process. assignments transitions supported a theoretical calculation based time-dependent density...

Intramolecular charge transfer (ICT) in a multibranched push–pull chromophore is key photophysical process which attracting attention due to its relevance the development of highly efficient organic light-emitting diodes, but excited-state dynamics chromophores still unclear. Here, using femtosecond transient absorption spectroscopy and singular value decomposition analysis, we studied excited state 2,6-bis(diphenylamino)anthraquinone (DPA-AQ-DPA), contains two diphenylamino (DPA) groups as...