Journal
CHEMICAL SOCIETY REVIEWS
Volume 50, Issue 22, Pages 12377-12449Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0cs00547a
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Funding
- Humboldt Foundation (Feodor-Lynen scholarship)
- Horizon 2020 Framework Program (ERC Advanced Investigator Grant) [694345]
- Ministry of Education, Culture and Science of the Netherlands (Gravitation Program) [024.001.035]
- Netherlands Organization for Scientific Research (NWO, VIDI Grant) [723.014.001]
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Molecular photoswitches enable precise control of processes using light as a stimulus, but the challenge lies in making them water-soluble for applications in biological systems. Design principles for water-soluble photoswitches are crucial for their future applications.
Molecular photoswitches enable dynamic control of processes with high spatiotemporal precision, using light as external stimulus, and hence are ideal tools for different research areas spanning from chemical biology to smart materials. Photoswitches are typically organic molecules that feature extended aromatic systems to make them responsive to (visible) light. However, this renders them inherently lipophilic, while water-solubility is of crucial importance to apply photoswitchable organic molecules in biological systems, like in the rapidly emerging field of photopharmacology. Several strategies for solubilizing organic molecules in water are known, but there are not yet clear rules for applying them to photoswitchable molecules. Importantly, rendering photoswitches water-soluble has a serious impact on both their photophysical and biological properties, which must be taken into consideration when designing new systems. Altogether, these aspects pose considerable challenges for successfully applying molecular photoswitches in aqueous systems, and in particular in biologically relevant media. In this review, we focus on fully water-soluble photoswitches, such as those used in biological environments, in both in vitro and in vivo studies. We discuss the design principles and prospects for water-soluble photoswitches to inspire and enable their future applications.
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