Molecular sensor
Videos
A molecular sensor or chemosensor is a molecular structure that is used for sensing of an analyte to produce a detectable change or a signal. The action of a chemosensor relies on an interaction occur
Schematic representation of a chemosensor consisting of a signalling moiety and a recognition moiety that are connected together in some way that facilitates the communication between the two parts.
Illustration of the common models used in sensor construction.
Left: Example of the change observed in the colorimetric azobenzene based chemosensor 1 in pH 7.4 solution upon recognition of copper ion. The recognition/sensing event being communicated as a clear change in colour that is visible to the naked eye. Right: The corresponding changes in the UV-visible absorption spectrum of the chemosensor upon recognition/binding to Cu(II) (shown in blue) and from the free sensor (shown in green). The changes after adding
One of the first examples of a fluorescent chemosensor developed for anion monitoring (phosphate) in competitive aqueous media. The chemosensors is not emissive in its 'free' form A, but upon recognition of the phosphate by the polyamine receptor moiety (through mixture of electrostatic and hydrogen bonding interactions) B, the fluorescence emission is gradually enhanced, resulting eventually in the formation of a highly fluorescent (host:guest) structure C.
In physics, absorption of electromagnetic radiation is how matter takes up a photon's energy—and so transforms electromagnetic energy into internal energy of the absorber.
Rough plot of Earth's atmospheric transmittance (or opacity) to various wavelengths of electromagnetic radiation, including visible light