摘要:

AbstractElectroluminescent devices with PVK film doped with Eu(DBM)3(phen) and PBD were fabricated. The device structure of glass substrate/indium‐tin‐oxide/PPV/PVK:Eu(DBM)3(phen):PBD/Alq3/Al was employed. The emissive layer was formed by spin‐casting method. A sharply red electroluminescence with a maximum luminance of 114.4 cd/m2was achieved at

ISSN:1001-604X    

DOI:10.1002/cjoc.19980160102

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1998

数据来源: WILEY

摘要:

AbstractIn this paper, the interaction between squarylium cyanine and porphyrin in chloroform is investigated by absorption and fluorescence spectroscopy. Emphasis has been put on the mechanism of intermolecular energy transfer. The overlap integralJbetween the absorption spectrum of squarylium cyanine and the fluorescence spectrum of porphyrin was calculated, which reveals that the singlet‐singlet energy transfer may occur&om porphyrin to squarylium cyanine in solution. In comparison of the observed rate constant [k11q=6.1×1013(mol/L)−1·s−l] for fluorescence quenching of porphyrin by squarylium cyanine with the diffusion rate constant in chloroform [kdif=1.1×1010(mol/L)−1·s−1] and the rate of energy transfer [ket≤6.7×104(mol/L)−1·s−1in the experimentally dilute solutions] estimated from Forster formula, the possibility of energy transfer by electron exchange or/and coulombic mechanism could be excluded. So it has been definitely convinced that the intermolecular energy transfer between them is performed through long‐distance radiative mechanism which is in good agreement with the results in experimentally dilute concentration (<10−4mol/L). Meanwhile, the fluorescence of squarylium cyanine can also be quenched by porphyrin, which suggests that photoinduced charge transfer with other process may occur. In the contrast, the results can be partly contributed to understand the reason why the energy transfer efficiencies of porphyrin ø11/et are always lower than its fluorescence

ISSN:1001-604X    

DOI:10.1002/cjoc.19980160103

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1998

数据来源: WILEY

摘要:

AbstractThe crystal structure of a Ni(II) complex with 1,7‐diaminoethyl‐4,10‐dimethyl,4,7,10‐tetraazacyclododecane has been determined by X‐ray diffraction method. Crystal data for NiC14H36Br2N6O: monoclinic, space group P21/n, a=0.8848(3), b=1.4656(3), c=1.5828(3) nm, β=90.47(3)°, V=2.0525 nm3, Z=4. The two pendant primary amino groups are located incispositions in the complex, their nitrogen atoms and the four nitrogen donors of the fold tetraaza‐macrocycle coordinate Ni(II) ion, forming a distorted octahe

ISSN:1001-604X    

DOI:10.1002/cjoc.19980160104

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1998

数据来源: WILEY

摘要:

Abstract(E)‐[(2‐Cyclohexenyl)vinyl]triaryitin (aryl=phenyl,p‐tolyl) were synthesized and characterized by elemental analysis, IR,1H NMR spectroscopy. The crystal structure of (E‐)[(2 cyclohexenyl)vinyl]triphenyltin was also determined by the X‐ray diffraction. Experiments show that this compound has the conjugated system, which makes it have possible bioactivity and antitumor

ISSN:1001-604X    

DOI:10.1002/cjoc.19980160105

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1998

数据来源: WILEY

摘要:

AbstractThe synthesis of monodisperse dendrimers triggers a great challenge to the synthetic chemistry. Here, we reported a facile convergent approach to the synthesis of the first generation, six‐directional ether‐bond polyols with better controlled structures and ease of purificat

ISSN:1001-604X    

DOI:10.1002/cjoc.19980160106

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1998

数据来源: WILEY

摘要:

Abstract(+)‐l‐Deoxy‐6‐epi‐castanospermine was asymmetrically synthesized in ten steps from a‐furfuryl amine derivative 6 in 2.9% overall yield. The kinetic resolution of a‐furfuryl mine derivative 6 and Sharpless AD reaction of 14 were used

ISSN:1001-604X    

DOI:10.1002/cjoc.19980160107

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1998

数据来源: WILEY

摘要:

AbstractImmobilization techniques and biocatalytic transformations performed in organic media are new developing methods for organic reactions. Baker's yeast was immobilized on the alginate supports. This preparation contained about 20% of dry yeast cells. The immobilized Baker's yeast were found to be very effective in the reduction of O‐benzoquinone, p‐benzoquinones, naphthoquinones, and anthraquinones in hex

ISSN:1001-604X    

DOI:10.1002/cjoc.19980160108

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1998

数据来源: WILEY

摘要:

AbstractPhosphatidylinositol polyphosphate (PIPx) are related with tyrosine kinase activation and cell proliferation and carcinogenesis. PIPxis an important target compound for synthetic organic chemist. PIPxhaving saturated fatty acid components have been reported. Recently we have succeeded in the synthesis of phosphatydylinositol‐3,4,5‐trisphosphate with unsaturated fatty acid component by the reaction of diethyl chlorophosphite with 1,2‐di‐O‐cyclohexylidene‐3,4‐0‐(tetraisopropyldisiloxane 1,3‐diyl)‐6‐O‐(4‐o

ISSN:1001-604X    

DOI:10.1002/cjoc.19980160109

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1998

数据来源: WILEY

摘要:

AbstractEight new l‐o‐chlorobenzoyl‐3‐(5′‐substituted phenylamino‐6′‐phenyl)‐1′,2′,4′‐triazinyl ureas (5a–h) have been synthesized and thei

ISSN:1001-604X    

DOI:10.1002/cjoc.19980160110

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1998

数据来源: WILEY

摘要:

AbstractNine C2‐symmetric chiral disulfonamides were designed and synthesized fromL‐valine,L‐phenylalanine andL‐leucine respectively via one‐pot ring opening of aziridines. The application of these disulfonamides as catalyst in the addition of diethyl zinc to benzaldehyde in three reagent systems: Ligand‐Ti(OiPr)r‐Et2Zn; Ligand‐Ti(O'Pr)d‐HzO‐Et2Zn; Ligand‐Et2

ISSN:1001-604X    

DOI:10.1002/cjoc.19980160111

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1998

数据来源: WILEY