Photokinetic behaviour of biphotochromic supramolecular systems

Ortica, F.; Levi, D. L.; Brun, Pierre; Guglielmetti, R.; Mazzucato, U.; Favaro, Giovanna

doi:10.1016/s1010-6030(01)00371-9

Cited by 28 publications

(19 citation statements)

References 8 publications

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“…Complexes of bisspiropyrans are known, and their complexing ability has been studied in comparison with monospiropyran [99,117,118]. It was found that the complexes of bisspiropyrans have higher photochemical activity than those of monospiropyrans.…”

Section: Chemical Characteristics Of Spiropyransmentioning

confidence: 99%

Spiropyrans: Synthesis, Properties, and Application. (Review)

Lukyanov

Lukyanova

2005

Chem Heterocycl Compd

205

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Published data on the synthesis and structural modification of spiropyrans and bisspiropyrans and production of the heteroanalogs of spiropyrans are classified and analyzed. The chemical characteristics of spiropyrans, including complexation of the open-chain isomers and cyclic forms are examined. Special attention is paid to the photochromic characteristics of spiropyrans at interfaces between phases.

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Section: Chemical Characteristics Of Spiropyransmentioning

confidence: 99%

Spiropyrans: Synthesis, Properties, and Application. (Review)

Lukyanov

Lukyanova

2005

Chem Heterocycl Compd

205

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“…In terms of kinetic investigations of photochromic systems, these findings relative to the issues of identifiability and distinguishability can easily and equally be raised for many other photochromic systems whether they exhibit similar photocoloring and fading curves to NPY (which is typical for the 3 H ‐naphthopyrans) or different ones as in the case of the 2 H ‐naphthopyrans 35,38,55–57.…”

Section: Resultsmentioning

confidence: 99%

“…Much less attention has been focused on the light‐initiated reaction 28–38. There have been some recent reports that have attempted to solve the ring‐opening photochemical kinetics.…”

Section: Introductionmentioning

confidence: 99%

“…In summary, in most of the latter studies 11–38, segregation of the fading and coloring reactions has been accepted as a working procedure. When analyzed from a conceptual viewpoint, it may be argued that the color‐generating reaction and the thermal back‐isomerization sequence are two separate processes; the reactions obey distinguishable basic processes, are realized under substantially different experimental conditions, and can be observed individually.…”

Section: Introductionmentioning

confidence: 99%

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Photophysics and kinetics of naphthopyran derivatives, part 2: Analysis of diarylnaphthopyran kinetics. Degeneracy of the kinetic solution

Maafi¹,

Brown²

2005

Int J of Chemical Kinetics

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The photocoloring and fading kinetics of the photochromic 3,3-diphenyl-3H-naphtho[2,1-b]pyran (NPY) have been analyzed using a kinetic treatment for three related species recently developed by us (Int J Chem Kinet 2005, 37(3), 162). The concepts of identifiability and distinguishability are developed with respect to the elucidation of the NPY kinetics. We find that neither set of kinetic data on its own, nor the two data sets combined, allow the true mechanism to be distinguished. In addition, even for a chosen mechanism, there exist degenerate sets of parameters i.e. the solutions are also unidentifiable. A discussion of the limits and uniqueness of the results' interpretation is presented. C 2005 Wiley Periodicals, Inc. Int J Chem Kinet 37: [717][718][719][720][721][722][723][724][725][726][727] 2005

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“…The choice of these four systems was made to observe the effect of non-conjugated and conjugated bridges. Indeed, recent studies by spectrophotometrical methods have underlined polyphotochromic behaviour [14,15]. On the other hand, the presence of the ethenic spacer is expected to generate photoisomerisation and photocyclisation, due to the similarity with diarylethene-type molecules.…”

Section: Introductionmentioning

confidence: 99%