Abstract Through the incorporation of various halogen‐substituted chiral organic cations, effects molecules on chiroptical properties hybrid organic–inorganic perovskites (HOIPs) are investigated. Among them, HOIP having a Cl‐substituted cation exhibits highest circular dichroism (CD) and polarized luminescence (CPL) intensities, indicating existence largest rotatory strength, whereas F‐substituted HIOP shows weakest intensities. The observed modulation can be correlated to varied magnetic...

White electroluminescent (EL) emission from single-layered solid-state light-emitting electrochemical cells (LECs) based on host−guest cationic iridium complexes has been successfully demonstrated. The devices show white EL spectra (Commission Internationale de l'Eclairage coordinates ranging (x, y) = (0.45, 0.40) to (0.35, 0.39) at 2.9−3.3 V with high color rendering indices up 80. Peak external quantum efficiency and peak power of the LEC reach 4% 7.8 lm/W, respectively. These results...

We report here, for the first time, experimental observation on excited-state intramolecular proton transfer (ESIPT) reaction of thiol in room-temperature solution. This phenomenon is demonstrated by a derivative 3-thiolflavone (3TF), namely, 2-(4-(diethylamino)phenyl)-3-mercapto-4H-chromen-4-one (3NTF), which possesses an -S-H···O═ H-bond (denoted dashed line) and has S1 absorption at 383 nm. Upon photoexcitation, 3NTF exhibits distinctly red emission maximized 710 nm cyclohexane with...

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%.

Vying for urea: The translational isomerism of a neutral [2]rotaxane can be controlled in solution through the addition and removal acetate anions. In absence ions, macrocyclic host recognizes diphenylurea derivative; recognition ions by urea-based station causes relocation macrocycle to another binding site (see picture). Supporting information this article is available on WWW under http://www.wiley-vch.de/contents/jc_2002/2007/z702197_s.pdf or from author. Please note: publisher not...

We report herein a new ditopic calix[4]arene receptor 25,27-bis-{[4-amino-4-(1-naphthyl)-2-oxo-3-butenyl]oxy}-26,28-dihydroxycalix[4]arene (2) for the simultaneous complexation of anionic and cationic species. The host molecule 25,27-bis{[3-(1-naphthyl)-5-isoxazolyl]methoxy}-26,28-dihydroxycalix[4]arene (1) was synthesised first followed by [Mo(CO)6]-mediated ring-opening reaction to give target 2. binding properties ligands 1 2 towards metal ions in CH3CN were investigated UV/Vis...

Support vector data description (SVDD) has become a very attractive kernel method due to its good results in many novelty detection problems. However, the decision function of SVDD is expressed terms expansion, which run-time complexity linear number support vectors. For applications where fast real-time response needed, how speed up crucial. This paper aims at dealing with issue reducing testing time SVDD. A called (F-SVDD) proposed. Unlike traditional methods all try compress expansion...

We report a molecular [2]rotaxane which comprises cage and dumbbell-shaped component, in translational isomerism can be performed reversibly through an situ anion exchange process, that is, sequential addition of Bu4NCl/AgPF6 reagent pairs. The incorporates two pyridinium dialkylammonium centers functions as triply operable switch, controlled altering the polarity solvent, adding acidic basic reagents (TFA/Et3N), varying nature counteranions (Cl- vs PF6-).

Small is beautiful: The [2]pseudorotaxane formed from dipropargylammonium tetrafluoroborate and the crown ether [21]crown-7 on SiO2 was stoppered with 1,2,4,5-tetrazine in a ball-milling process (see X-ray structure). This new efficient solvent-free reaction led to isolation high yield (81 %) of smallest [2]rotaxane reported date. Supporting information for this article available WWW under http://www.wiley-vch.de/contents/jc_2002/2008/z803056_s.pdf or author. Please note: publisher not...

Factual scenario analysis of a judgement is critical to judges during sentencing. With the increasing number legal cases, professionals typically endure heavy workloads on daily basis. Although few previous studies have applied information technology according our research, no prior predicted pending using documents. In this article, we introduce an innovative solution predict relevant rulings. The proposed approach employs text mining methods extract features from precedents and applies...

The LiPF 6 /LiTFSI dual-salt gel polymer electrolyte possesses a well-distributed framework which benefits lithium ion transport pathway and further enhances its compatibility with metal electrochemical performance of batteries.

2-Isocyanobiphenyl·BX 3 adducts (X = I, Br, Cl) undergo unexpected C–H bond-functionalizing cyclizations upon heating, yielding polycyclic heteroaromatics via C–C bond forming reactions.

A series of cylcopalladated complexes containing a six-membered chelating ring with the general formula [Pd(Cl)(k2N,C-CH2C6H2(Me)2CHNAr)]2 [where Ar = 2,6-(Me)2C6H3− (3a); 2,6-(iPr)2C6H3− (3b)] and related phosphine-substituted species [PdCl(k2N,C-CH2C6H2(Me)2CHNAr)(PR3)] [Ar 2,6-(Me)2C6H3−, R Cy (5a); 2,6-(iPr)2C6H3, (5b); Ph (5c); 2,6-(iPr)2C6H3−, (5d)] have been synthesized. In addition, an ortho-metalated complex [PdCl(k2N,C-C6H4CHN(2,6-iPr2C6H3))(PCy3)] (7) was prepared by similar...

Take five: Two dialdehydes, two diamines, one Na+ ion have been used to generate a [2]catenane. This simple and efficient synthesis makes use of as template align in an orthogonal manner diethylene glycol chains between the amine groups (see scheme, TFPB−=tetrakis(3,5-trifluoromethylphenyl)borate). As service our authors readers, this journal provides supporting information supplied by authors. Such materials are peer reviewed may be re-organized for online delivery, but not copy-edited or...

Give me a B: A stepwise chloride abstraction of [Cp*BCl2(IMes)] resulted in the linear di-substituted boron dication [Cp*B(IMes)]2+. The hypercoordinated dication, stabilized pentagonal pyramidal [C5B]2+ cluster, reacts with superhydride to yield N-heterocyclic carbene-stabilized borabenzene, [C5Me5B(IMes)] (see scheme). As service our authors and readers, this journal provides supporting information supplied by authors. Such materials are peer reviewed may be re-organized for online...

We have prepared [2]rotaxanes, the behavior of which as switchable catalysts depends on their pirouetting motion, can be controlled through addition and removal Na+ ions. At least three sequential on/off cycles a Michael reaction performed in situ when using NaTFPB/[2.2.2]cryptand reagent pair to switch "on" "off" catalytic ability [2]rotaxanes.

Konkurrenz um Harnstoff: Die Translationsisomerie eines neutralen [2]Rotaxans lässt sich in Lösung durch Zugeben und Entfernen von Acetationen steuern. In Abwesenheit erkennt der makrocyclische Wirt ein Diphenylharnstoff-Derivat; bei Erkennung die Harnstoff-Einheit wird Makrocyclus zu einer anderen Bindungsstelle verschoben (siehe Bild).

Cationic iridium complexes incorporated 4,5-diaza-9,9'-spirobifluorene as N(∧)N ancillary ligands, in which one (2) or two (3) phenyl groups were introduced onto 4,5-diazafluorene to afford intraligand π-π interactions. The X-ray crystal structures of 2 and 3 show that the pendant ring forms strong intramolecular face-to-face π-stacking with difluorophenyl cyclometalated ligand distances 3.38 Å for complex 3.40 3.46 3. This stacking interaction minimizes expansion metal-ligand bonds excited...