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DOI:
https://doi.org/10.34804/supra.20210928262 Cc Cc by 4.0

Title:
Photochromism of a Merocyanine Dye Bound to Sulfonatocalixarenes: Effect of pH and the Size of Macrocycle on the Kinetics

https://pubs.acs.org/na101/home/literatum/publisher/achs/journals/content/jpcbfk/2013/jpcbfk.2013.117.issue-2/jp310167j/production/images/large/jp-2012-10167j_0010.jpeg

Description:
The effect of 1:1 complex formation on the photochromic behavior of the merocyanine isomer of a nitro-substituted spirobenzopyran dye was studied in aqueous solution using 4-sulfonatocalixarene (SCXn) cavitands possessing four or eight phenol units. The binding constants were independent of the size of the macrocycle, and about 7-fold more stable associates were produced at pH 2.3 than in slightly alkaline solution. The complexation with SCXn diminished the acidity of protonated merocyanine (trans-MCH+) and precluded its photoinitiated transition to spirobenzopyran form, but did not affect the reactions in basic media. Upon exposure to light, the complexed trans-MCH+ was converted to cis isomer. The association with 4-sulfonatocalix[4]arene slowed down the thermal back reaction in the dark to a larger extent than the confinement to 4-sulfonatocalix[8]arene. Both the activation energy and the Arrhenius A factor were significantly larger when the smaller, more rigid macrocycle served as a host.

Citation:

Z. Miskolczy, L. Biczók, SupraBank 2024, Photochromism of a Merocyanine Dye Bound to Sulfonatocalixarenes: Effect of pH and the Size of Macrocycle on the Kinetics (dataset). https://doi.org/10.34804/supra.20210928262

Link: https://doi.org/10.34804/supra.20210928262
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Citation:

Z. Miskolczy, L. Biczók, J. Phys. Chem. B 2013, 117, 648–653.

Link: https://doi.org/10.1021/jp310167j
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Creators:
Orcidid | Ror | Zsombor Miskolczy
Orcidid | Ror | László Biczók

Contributers:
Orcidid | Ror | Anxhela Zhiti | DataManager

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