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The Future of Photochemistry of Organic Compounds
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The Future of Photochemistry of Organic Compounds

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Photochemistry".

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 10612

Special Issue Editors

Dr. Qi-Wei Zhang

E-Mail Website
Guest Editor
Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, China
Interests: supramolecular chemistry; photochemistry; luminescent materials; NIR materials; optical sensors; phototherapy
Dr. Canjia Zhai

E-Mail Website
Co-Guest Editor
Department of Chemistry, University of South Florida, Tampa, FL 33620, USA
Interests: molecular imaging; supramolecular chemistry

Special Issue Information

Dear Colleagues,

Photochemistry is an ancient but fascinating brand of chemistry which originated billions of years ago and sustains almost all life on Earth. In a broad sense, molecular photochemistry is often considered as photoreactions or photoinduced excited state dynamics when molecules absorb and convert light. Due to the intrinsic advantages of cleanliness, remote operation, precise controllability, and non-invasiveness of photochemistry, it has gained increasing interest in modern chemistry, especially in the fields of green chemistry, energy storage/conversion, smart materials, and precision medicine. Despite the great progress in understanding the general mechanisms of photochemistry, more efficient conversion, better reversibility, faster response, and lower energy requirements (visible light or near-infrared light input) will be the goals that chemists continue to pursue.

This Special Issue will focus on the recent advances and discoveries in photochemical synthesis, photo-protection/cleavage, photo-responsive molecules/assemblies, photon upconversion, photocatalysis, photodynamic therapy, photothermal conversion, and other potential applications. Original research articles, communications, and reviews from experimental or theoretical studies are all welcome. 

Dr. Qi-Wei Zhang
Dr. Canjia Zhai
Guest Editors

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 submissions that pass pre-check are 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. Molecules is an international peer-reviewed open access semimonthly 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 2700 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

  • photochemistry
  • photochromism
  • photocage
  • photochemical synthesis
  • photo-responsive organic materials
  • organic photosensitizer
  • photodynamic therapy
  • photothermal conversion
  • photo-controlled drug delivery

Published Papers (4 papers)

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Research

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11 pages, 3775 KiB  
Article
A New Microporous Lanthanide Metal–Organic Framework with a Wide Range of pH Linear Response
by Ruyi Zhang, Liangliang Zhu and Bingbing Yue
Molecules 2022, 27(24), 8696; https://doi.org/10.3390/molecules27248696 - 8 Dec 2022
Cited by 2 | Viewed by 1579
Abstract
Lanthanide metal–organic frameworks (Ln-MOFs) have attracted extensive attention because of their structural adjustability and wide optical function applications. However, MOFs with a wide linear pH response and stable framework structures in acidic or alkaline solutions are rare to date. Here, we used 4,4′,4″-s-triazine-2,4,6-triyltribenzoate [...] Read more.
Lanthanide metal–organic frameworks (Ln-MOFs) have attracted extensive attention because of their structural adjustability and wide optical function applications. However, MOFs with a wide linear pH response and stable framework structures in acidic or alkaline solutions are rare to date. Here, we used 4,4′,4″-s-triazine-2,4,6-triyltribenzoate (H3TATB) as an organic ligand, coordinated with lanthanide ions (Eu3+/Tb3+), and synthesized a new metal–organic framework material. The material has a porous three-dimensional square framework structure and emits bright red or green fluorescence under 365 nm UV light. The carboxyl group of the ligand is prone to protonation in an acidic environment, and negatively charged OH− and ligand (TATB3−) have a competitive effect in an alkaline environment, which could affect the coordination ability of ligand. The luminescence degree of the framework decreases with the increase in the degree of acid and base. In particular, such fluorescence changes have a wide linear response (pH = 0–14), which can be used as a potential fluorescence sensing material for pH detection. Full article
(This article belongs to the Special Issue The Future of Photochemistry of Organic Compounds)
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16 pages, 5035 KiB  
Article
Cucurbit[7]uril Complexation of Near-Infrared Fluorescent Azobenzene-Cyanine Conjugates
by Sai Shradha Reddy Kommidi and Bradley D. Smith
Molecules 2022, 27(17), 5440; https://doi.org/10.3390/molecules27175440 - 25 Aug 2022
Cited by 4 | Viewed by 3186
Abstract
Two new azobenzene heptamethine cyanine conjugates exist as dispersed monomeric molecules in methanol solution and exhibit near-infrared (NIR) cyanine absorption and fluorescence. Both conjugates form non-emissive cyanine H-aggregates in water, but the addition of cucurbit[7]uril (CB7) induces dye deaggregation and a large increase [...] Read more.
Two new azobenzene heptamethine cyanine conjugates exist as dispersed monomeric molecules in methanol solution and exhibit near-infrared (NIR) cyanine absorption and fluorescence. Both conjugates form non-emissive cyanine H-aggregates in water, but the addition of cucurbit[7]uril (CB7) induces dye deaggregation and a large increase in cyanine NIR fluorescence emission intensity. CB7 encapsulates the protonated azonium tautomer of the 4-(N,N-dimethylamino)azobenzene component of each azobenzene–cyanine conjugate and produces a distinctive new absorption band at 534 nm. The complex is quite hydrophilic, which suggests that CB7 can be used as a supramolecular additive to solubilize this new family of NIR azobenzene–cyanine conjugates for future biomedical applications. Since many azobenzene compounds are themselves potential drug candidates or theranostic agents, it should be possible to formulate many of them as CB7 inclusion complexes with improved solubility, stability, and pharmaceutical profile. Full article
(This article belongs to the Special Issue The Future of Photochemistry of Organic Compounds)
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10 pages, 3028 KiB  
Article
Triphenylamine, Carbazole or Tetraphenylethylene-Functionalized Benzothiadiazole Derivatives: Aggregation-Induced Emission (AIE), Solvatochromic and Different Mechanoresponsive Fluorescence Characteristics
by Yue Yang, Diandian Deng, Xiaowen Deng, Zhao Chen and Shouzhi Pu
Molecules 2022, 27(15), 4740; https://doi.org/10.3390/molecules27154740 - 25 Jul 2022
Cited by 4 | Viewed by 2142
Abstract
The development of mechanochromic fluorophors with high-brightness, solid-state fluorescence is very significant and challenging. Herein, highly solid-state emissive triphenylamine, carbazole and tetraphenylethylene-functionalized benzothiadiazole derivatives were developed. These compounds showed remarkable aggregation-induced emission and solvatochromic fluorescence characteristics. Furthermore, these fluorogenic compounds also displayed different [...] Read more.
The development of mechanochromic fluorophors with high-brightness, solid-state fluorescence is very significant and challenging. Herein, highly solid-state emissive triphenylamine, carbazole and tetraphenylethylene-functionalized benzothiadiazole derivatives were developed. These compounds showed remarkable aggregation-induced emission and solvatochromic fluorescence characteristics. Furthermore, these fluorogenic compounds also displayed different mechanically triggering fluorescence responses. Full article
(This article belongs to the Special Issue The Future of Photochemistry of Organic Compounds)
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Review

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23 pages, 5863 KiB  
Review
Polymeric Emissive Materials Based on Dynamic Covalent Bonds
by Shuyuan Zheng and Guofeng Liu
Molecules 2022, 27(19), 6635; https://doi.org/10.3390/molecules27196635 - 6 Oct 2022
Cited by 7 | Viewed by 2985
Abstract
Dynamic covalent polymers, composed of dynamic covalent bonds (DCBs), have received increasing attention in the last decade due to their adaptive and reversible nature compared with common covalent linked polymers. Incorporating the DCBs into the polymeric material endows it with advanced performance including [...] Read more.
Dynamic covalent polymers, composed of dynamic covalent bonds (DCBs), have received increasing attention in the last decade due to their adaptive and reversible nature compared with common covalent linked polymers. Incorporating the DCBs into the polymeric material endows it with advanced performance including self-healing, shape memory property, and so forth. However, the emissive ability of such dynamic covalent polymeric materials has been rarely reviewed. Herein, this review has summarized DCBs-based emissive polymeric materials which are classified according to the different types of DCBs, including imine bond, acylhydrazone bond, boronic ester bond, dynamic C-C bond, as well as the reversible bonds based on Diels–Alder reaction and transesterification. The mechanism of chemical reactions and various stimuli-responsive behaviors of DCBs are introduced, followed by typical emissive polymers resulting from these DCBs. By taking advantage of the reversible nature of DCBs under chemical/physical stimuli, the constructed emissive polymeric materials show controllable and switchable emission. Finally, challenges and future trends in this field are briefly discussed in this review. Full article
(This article belongs to the Special Issue The Future of Photochemistry of Organic Compounds)
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