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Special Issue "Photoswitchable Materials"

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: closed (30 July 2017)

Special Issue Editor

Guest Editor
Dr. Vance Williams

Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby B.C., V5A 1S6, Canada
Website | E-Mail
Phone: 778-782-8059
Fax: +1 778 782 3765
Interests: organic synthesis; liquid crystals; conjugated polymers; gels; self-assembly; molecular recognition; electronic materials; photochromism; novel aromatic systems

Special Issue Information

Dear Colleagues,

Although the phenomenon of photochromism was discovered more than a century ago, it is only within the last two decades that the study of molecular photoswitches has attracted serious attention. The ability to toggle molecular and macroscopic properties continues to be exploited both in solution and the solid state, and for applications that range from the modulation of biological processes to information and energy storage. The ongoing importance of these systems was recently highlighted by the 2016 Nobel Prize for Chemistry, awarded to Ben Feringa for his work on photoswitches and their use in molecular machines.

It is within the field of material science that photoswitches realize their true potential. Changes at the molecular level that accompany switching processes have been used to create dynamic materials whose macroscopic optical, electronic and morphological properties can be reversibly altered using light. This Special Issue is dedicated to work at the frontier of research into advanced materials that exploit the unique opportunities presented by these photoactive building blocks.

Dr. Vance Williams
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1500 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

 

Keywords

  • molecular switches
  • photoswitches
  • photochromism
  • photochemistry

Published Papers (2 papers)

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Research

Open AccessFeature PaperArticle Level of Theory and Solvent Effects on DASA Absorption Properties Prediction: Comparing TD-DFT, CASPT2 and NEVPT2
Materials 2017, 10(9), 1025; doi:10.3390/ma10091025
Received: 29 July 2017 / Revised: 26 August 2017 / Accepted: 1 September 2017 / Published: 3 September 2017
PDF Full-text (2122 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Donor–acceptor Stenhouse adducts (DASAs) are a very recent class of organic photoswitches that combine excellent properties, such as color and polarity change, a large structural modification, and excellent fatigue resistance. Despite their potential applications in different fields, very few studies have focused on
[...] Read more.
Donor–acceptor Stenhouse adducts (DASAs) are a very recent class of organic photoswitches that combine excellent properties, such as color and polarity change, a large structural modification, and excellent fatigue resistance. Despite their potential applications in different fields, very few studies have focused on rationalizing their electronic structure properties. Here, by means of different state-of-the-art theoretical methods, including solvent and vibrational effects, we show that while time dependent-density functional theory (TD-DFT) can qualitatively describe DASAs’ excited states, multiconfigurational quantum chemistry methods along with dynamic electron correlation (CASPT2, NEVPT2) are required for a quantitative agreement with the experiment. This finding is reasoned based on the different charge transfer characteristics observed. Moreover, the TD-DFT computed two-photon absorption properties are reported and suggested to red-shift the absorption band, as required for biological applications. Full article
(This article belongs to the Special Issue Photoswitchable Materials)
Figures

Figure 1

Open AccessArticle Photoswitchable Fluorescent Diarylethene Derivatives with Thiophene 1,1-Dioxide Groups: Effect of Alkyl Substituents at the Reactive Carbons
Materials 2017, 10(9), 1021; doi:10.3390/ma10091021
Received: 30 July 2017 / Revised: 21 August 2017 / Accepted: 26 August 2017 / Published: 2 September 2017
PDF Full-text (2369 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Photoswitching and fluorescent properties of sulfone derivatives of 1,2-bis(2-alkyl-4-methyl-5-phenyl-3-thienyl)perfluorocyclopentene, 15, having methyl, ethyl, n-propyl, i-propyl, and i-butyl substituents at the reactive carbons (2- and 2′-positions) of the thiophene 1,1-dioxide rings were studied. Diarylethenes 15 underwent
[...] Read more.
Photoswitching and fluorescent properties of sulfone derivatives of 1,2-bis(2-alkyl-4-methyl-5-phenyl-3-thienyl)perfluorocyclopentene, 15, having methyl, ethyl, n-propyl, i-propyl, and i-butyl substituents at the reactive carbons (2- and 2′-positions) of the thiophene 1,1-dioxide rings were studied. Diarylethenes 15 underwent isomerization reactions between open-ring and closed-ring forms upon alternate irradiation with ultraviolet (UV) and visible light and showed fluorescence in the closed-ring forms. The alkyl substitution at the reactive carbons affects the fluorescent property of the closed-ring isomers. The closed-ring isomers 2b5b with ethyl, n-propyl, i-propyl, and i-butyl substituents show higher fluorescence quantum yields than 1b with methyl substituents. In polar solvents, the fluorescence quantum yield of 1b markedly decreases, while 2b5b maintain the relatively high fluorescence quantum yields. Although the cycloreversion quantum yields of the derivatives with methyl, ethyl, n-propyl, and i-propyl substituents are quite low and in the order of 10−5, introduction of i-butyl substituents was found to increase the yield up to the order of 10−3. These results indicate that appropriate alkyl substitution at the reactive carbons is indispensable for properly controlling the photoswitching and fluorescent properties of the photoswitchable fluorescent diarylethenes, which are potentially applicable to super-resolution fluorescence microscopies. Full article
(This article belongs to the Special Issue Photoswitchable Materials)
Figures

Figure 1

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