We designed a stepwise approach for co-sensitization of zinc porphyrin sensitizer (LD12) with spirally configured organic dye (CD5) dye-sensitized solar cells. The co-sensitized LD12 + CD5 device showed significantly enhanced VOC and JSC relative to its individual single-dye sensitized devices. Upon optimization, the made system yielded JSC/mA cm−2 = 16.7, VOC/V 0.74, FF 0.73 η 9.0%; this performance is superior that either from (η 7.5%) 5.7%) under same conditions fabrication. To understand...

Co-sensitization of two or more dyes with complementary absorption spectra on a semiconductor film is an effective approach to enhance the performance dye-sensitized solar cell (DSSC). Porphyrin sensitizer YD2-oC8 showed outstanding photovoltaic co-sensitized organic dye cover entire visible spectral region, 400–700 nm. To promote light-harvesting capability beyond 700 nm, porphyrin dimer (YDD6) was synthesized for system. We report systematic engineering molecular co-sensitization TiO2...

A series of chiral oxovanadium(IV) complexes derived from tridentate N-3,5-substituted and N-3,4-benzo- N-5,6-benzo-salicylidene-alpha-amino acids can serve as efficient catalysts for the enantioselective oxidative couplings various 3-, 6-, 7-substituted 2-naphthols under O(2). The best scenario involves use a vanadyl complex arising 2-hydroxy-1-naphthaldehyde valine (or phenylalanine) in CCl(4), leading to BINOLs good yields (75-100%) with enantioselectivities up 68%.

A series of oxovanadium(IV) complexes derived from tridentate N-ketopinidene-α-amino acids were synthesized. They serve as efficient catalysts for the enantioselective oxidative couplings various 3-, 6-, or 7-substituted 2-naphthols. The best scenario involves use a vanadyl complex arising l-tert-leucine in CCl4. asymmetric 2-naphthols can be conducted smoothly at 40−45 °C under stream gaseous oxygen, leading to 2,2'-dihydroxy-1,1'-binaphthyls good yields (61−99%) and with...

The titled dipolar hybrids bearing a central quinoxaline-fused dibenzosuberene optoelectronic unit with functional C5 and C8 appendages spiro-fluorene junction act as fluorescent bipolar OLED chameleons. emission colors can be tuned from blue, green, yellow, to red operation brightness of 205, 1268, 1542, 1102 cd/m2, respectively, at 20 mA/cm2.

An unprecedented vanadyl(V) methoxide complex 4 derived from 3,5-dibromo-N-salicylidene-l-tert-leucinate enables highly enantioselective aerobic oxidations of α-hydroxyphosphonates at ambient temperature with selectivity factors ranging 3 to >99.

Abstract Compared to monovalent carbohydrates, multivalent carbohydrate ligands exhibit significantly enhanced binding affinities their interacting proteins. Here, we report globotriose (P k ligand)‐functionalized gold nanoparticle (AuNP) probes for the investigation of interactions with B 5 subunit Shiga‐like toxin I (B‐Slt). Six P ‐ligand‐encapsulated AuNPs ‐AuNPs) varying particle size and linker length were synthesized evaluated potential as affinity by using a surface plasmon resonance...

Abstract The fluorescent dye Cy3 and galactose derivatives are covalently assembled with different ratios on the surfaces of magnetic nanoparticles (MNPs) to produce multifunctional HepG2 cancer cell–targeting agents effect ligand spatial orientation MNP surface is investigated targeting specificity. By using a mixture bis‐ N ‐hydroxysuccinimide ester (a bifunctional linker) OSu‐activated (w/w = 30:1), stable quantifiable MNPs (Cy3@MNPs) synthesized that could be subsequently loaded...

Yellow emission is crucial in RGBY display technology and fabricating physiologically friendly, low color‐temperature lighting sources. Emitters with both wet‐ dry‐process feasibility are highly desirable to fabricate, respectively, high‐quality devices via vapor deposition cost‐effective, large‐area roll‐to‐roll fabrication. Here, high‐efficiency organic light‐emitting diodes a novel feasible yellow‐emitting iridium complex, bis[5‐methyl‐7‐fluoro‐5H‐benzo(c)(1,5) naphthyridin‐6‐one]iridium...

Chirality-switchable, 4-aminopyridine-based, pseudo-enantiomeric helicenes can catalyze enantiodivergent Steglich rearrangement in up to 91% ee (<italic>R</italic>) and 94% (<italic>S</italic>), respectively.

The titled hybrids bearing a central dibenzosuberene optoelectronic unit with functional C3 and C7, N,N-diarylamino appendages, spiro-fluorene junction act as blue fluorescent OLED materials. Sharp (464 nm, Δλfwhm = 47−60 nm) devices can thus be furnished high ηext of 7.9%, L20 2689 cd/m2, ηc 13.6 (cd/A), ηp 8.2 (lm/W) at 20 mA/cm2.

A series of chiral vanadyl carboxylates derived from N -salicylidene- l -α-amino acids and sulfate has been developed. These configurationally well defined complexes were examined for the kinetic resolution double- mono-activated 2° alcohols. The best templates involve combination - tert -leucine 3,5-di- t -butyl-, 3,5-diphenyl-, or 3,4-dibromo-salicylaldehyde. resulting vanadyl(V)-methoxide after recrystallization air-saturated methanol serve as highly enantioselective catalysts asymmetric...

A diverse array of oxometallic species were examined as catalysts for a test direct condensation benzoic acid and 2-phenylethanol in 1:1 stoichiometry. Besides group IVB MOCl2−xH2O TiOX2−xH2O, VB VOCl2−xTHF TiO(acac)2 found to be the most efficient water-tolerant reaction. The new neutral catalytic protocol with optimal tolerates many stereo/electronic structural variations both (di)acid (1°−3° alkyl aryl) (di)alcohol (1°, 2° alkyl, components high chemoselectivity.

A highly efficient and mild method for azido glycosylation of glycosyl β-peracetates to 1,2-trans azides was developed by using inexpensive FeCl(3) as the catalyst. In addition, we demonstrated, first time, that in combination with copper powder can promote 1,3-dipolar cycloaddition (click chemistry) glycosides terminal alkynes. Good excellent yields were obtained exclusive formation a single isomer both azidation subsequent processes.

A series of oxometallic species and metal acetylacetonates (acac) was examined as catalysts for oxidative carbonylation styrene with benzaldehyde using t-butylhydroperoxide the co-oxidant in warm acetonitrile. Among them, VO((acac)2 vanadyl(IV) chloride were found to be only catalyst class achieve cross-coupling processes by judiciously tuning ligand electronic attributes, leading β-hydroxylation- β-peroxidation-carbonylation styrene, respectively, a complementary manner. Mechanistic studies...

[reaction: see text] Among six different group VIb oxometallic species examined, dioxomolybdenum dichloride and oxomolybdenum tetrachloride were the most efficient catalysts to facilitate nucleophilic acyl substitution (NAS) of anhydrides with a myriad array alcohols, amines, thiols in high yields chemoselectivity. In contrast well-recognized redox chemical behaviors associated oxomolybdenum(VI) species, catalytic NAS was unprecedented tolerates virtually all kinds functional groups. By...

Chiral oxidovanadium(V) methoxides prepared from 3,5-disubstituted-N-salicylidene-l-tert-butylglycines and vanadyl sulfate in air-saturated MeOH serve as highly enantioselective catalysts for asymmetric aerobic oxidations kinetic resolution of alkyl, aryl, heteroaryl α-hydroxy-ketones with differed α-substituents at ambient temperature toluene or TBME (tert-butyl methyl ether). The best scenarios involve the use complexes which bear tridendate templates derived 3,5-diphenyl-...

A gallamide-containing pseudoenantiomeric helicene pair bearing a (10R,11R)-dimethoxymethyldibenzosuberane core can self-assemble by intermolecular amide H-bonding and π-π stacking into bundled helical fibers with tunnels of complementary helicity in CH2Cl2. The helicenes undergo excellent photoswitchings ternary logic at 280, 318, 343 nm through (-)-gel-sol-(+)-gel interconversion.

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTChiral Triarylcarbenium Ions in Asymmetric Mukaiyama Aldol AdditionsChien-Tien Chen, Shi-Deh Chao, Kuao-Chung Yen, Chung-Horng Iy-Chen Chou, and Sang-Weng HonView Author Information Department of Chemistry, National Taiwan Normal University, Taipei, 117 Cite this: J. Am. Chem. Soc. 1997, 119, 46, 11341–11342Publication Date (Web):November 19, 1997Publication History Received18 March 1997Published online19 November inissue 1...

[reaction--see text] Among four vanadyl species examined, triflate was the most efficient catalyst to facilitate nucleophilic acyl substitution of anhydrides with a myriad array alcohols, amines, and thiols in high yields chemoselectivity. By using mixed-anhydride technique, one can achieve oleate peptide syntheses. In marked contrast common metal triflates, amphoteric character V=O unit proven be responsible for catalytic profile this process.

Among 18 oxometallic species, MoO2Cl2 was found to be the most reactive in catalytic thioglycosylation of O-acetylated glycosides with functionalized thiols CH2Cl2, leading cleanly 1,2-trans-thioglycosides exclusive diastereocontrol. The new protocol is applicable a monoglycoside building block and beta-(1-->6)-S-linked-thiodisaccharide synthesis. [reaction: see text].

Abstract A new tri‐antennary, galactoside‐capped gallamide dendritic anchor with thiolate focal group is synthesized via click chemistry. The highly hydrophilic dendron was efficiently anchored onto the surface of CdSe/ZnS core/shell nanoparticles in a covalent fashion, as evidenced by 1 H NMR spectrum resultant nanohybrid intact core fluorescent property. water‐soluble nano‐hybrid found smoothly and selectively uptaken lung cancer cells enriched membrane‐bound asialoprotein receptors 2–3 h,...

An unprecedented dual-mode optical switch by combining helicene and bis-azobenzene moieties in proximity allows for cooperative, highly diastereoselective chirochromic (92/8 to 3/97) photochromic (>99/<1 19/81) switchings both solution nematic LC with tunable pitches handedness permutation of four different metastable states.

High efficiency green emission is crucial to the designs of energy‐saving display and lighting. Efficient electroluminescent emitters with both wet‐ dry‐process feasibility highly desirable in order realize, respectively, cost‐effective large roll‐to‐roll manufacturing high performance products. In this study, high‐efficiency, phosphorescent, organic light emitting diodes a novel iridium complex, bis[5‐methyl‐8‐trifluoromethyl‐5H‐benzo(c)(1,5)naphthyridin‐6‐one] (acetylacetonate), are...

We demonstrate the feasibility of bringing sunset hue indoors via a dusk-light-style organic light emitting diode that exhibits color temperature ranging between 1500 and 3000 K, covering within last 30 min before sunset. Like sunset, device chromaticity changes from yellowish white to reddish orange, with illuminance decreasing by 60-fold as decreases 2900 2100 K. The artificial dusk at 2745 for example, shows 92 rendering index an 87% luminance spectrum resemblance hue. very high character...