A molecular switch is a molecule that can be reversibly shifted between two or more stable states in response to external stimuli, such as a change on pH, light or electric current. These molecules are of interest in the field of nanotechnology for application in molecular computers or responsive drug delivery systems. If in one of the two states (on/off) the molecule is fluorescent, the compounds are then called fluorescent molecular switches, and their applications are even more interesting in the field of life sciences, especially if they can operate in small spaces. For example, they can be used for biosensing and as imaging probes inside cells.
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Source: Phys.org