摘要:

Three indolylfulgenates possessing diesters of 14-crown-4 (2), 17-crown-5 (3), and 20-crown-6 (4) groups were synthesized and their photochromic behaviors in the presence or absence of alkali metal cations (Li+, Na+, K+) were investigated. Notable features are: (1) The association constant of Na+was the largest for3, and that for K+was the largest for4, (2) The association of E- and Z-forms are stronger than C-form. (3) In the cases of Na+-3and K+-4, no photocoloration occurred. (4) As for the photochromism of2, no effects of alkali metal species were observed. These phenomena were elucidated by molecular mechanics calculations.

ISSN:1058-725X    

DOI:10.1080/10587250008023847

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Crowned bis(spirobenzopyran)1can bind a divalent metal ion Ca2+more powerfully than monovalent alkali metal ions due to the doubly armed ionic interaction. The Ca2+complexation and selectivity between Ca2+and K+can be controlled by turning on and off visible light.

ISSN:1058-725X    

DOI:10.1080/10587250008023848

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

The review of own results in the field of the unusual properties (photoinduced nonlinear behavior, irradiation capacity, complex formation, refractive index, reactionary ability) for spirocompounds exhibiting photochromic transformations is presented. These polyfunctional properties of spirocompounds extend their capabilities for application in modem optical information technologies and molecular photonics.

ISSN:1058-725X    

DOI:10.1080/10587250008023849

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

A novel photochromic compound, 3-phenyl-3-(1,2-dimethylindol-3-yl)-3H-naphtho[2,1-b] pyran (I) was synthesized and the mechanism for photochromic process ofIwas investigated by nanosecond laser flash photolysis.

ISSN:1058-725X    

DOI:10.1080/10587250008023850

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

ABATRACT The photochromic behavior of 2-phenyl-2-(thien-2-yl)-2H-benzo [b]furano[3,2-f]benzopyran (1) and 2,2-diphenyl-2H-benzo[b] furano[3,2-f]benzopyran (2) was examined by the nanosecond laser photolysis and normal time scale analysis. The results showed that the thienyl group could stabilize the colored forms as compared with the phenyl group and both singlet and triplet states were involved in the formation of the colored forms.

ISSN:1058-725X    

DOI:10.1080/10587250008023851

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

A series of novel bis-spironaphthooxazines (3a∼3i) and (4) containing a phosphoryl group were synthesized in 70∼91% yield. Their photochromic behaviors and photostabilty were investigated with the aid of absorption spectral measurements, showing that they exhibited higher fatigue resistance in the coloration and decoloration cycle than that of the parent reference compound1.

ISSN:1058-725X    

DOI:10.1080/10587250008023852

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Two series of novel spiropyrans and spirooxazines containing an antioxidant group as a pendant were synthesized by a convenient method. Their photochromic behaviors and photostabilty were investigated with the aid of absorption spectral measurements, showing that they exhibited higher fatigue resistance than that of the parent spiro-compounds.

ISSN:1058-725X    

DOI:10.1080/10587250008023853

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

A diarylethene having a chiral substituent underwent a diastereoselective photocyclization reaction in the crystalline phase, while the selectivity was not observed in solution.

ISSN:1058-725X    

DOI:10.1080/10587250008023854

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

A novel ferrocene-modified bis(spirobenzopyran) was designed and synthesized. The spirobenzopyran possesses two photochromic moieties, which were tethered to two cyclopenta-dienyl rings of ferrocene via ethynediyl spacers. Photochromic properties of the spirobenzopyran were investigated in the absence and presence of various metal cations.

ISSN:1058-725X    

DOI:10.1080/10587250008023855

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

A spirobenzothiapyran derivative bearing a monoaza-12-crown-4 moiety shows remarkable stabilization of its photoinduced colored isomer (merocyanine form) by complexation of a metal ion, especially Li+and Ag+. Comparison of the crowned spirobenzothiapyran with its corresponding spirobenzopyran derivative indicates that the stabilization of the merocyanine form in the presence of Li+and Ag+are derived mainly from the metal-ion complexing ability of its crown ether moiety and the metal-ion affinity of its merocyanine thiophenolate anion, respectively.

ISSN:1058-725X    

DOI:10.1080/10587250008023856

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor