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The classic spectral molecular sensor consists of a binding site linked to a chromophore via a conjugate or nonconjugate spacer, thus a spectral background may exist. It is therefore demanded to have a spectral sensing scheme with in situ formed chromophore when the sensing species is present with the sensory molecule that the spectral sensing is in principle background free. Metal cations of d8 or d10 electronic configuration when brought into close proximity would facilitate the metallophilic interaction, exhibiting characteristic spectral signals from the chromophore in situ generated upon the occurrence of metal … metal interaction. This Review discusses four spectral sensing platforms with chromophores in situ generated, i.e., the homoatomic metallophilic complexes such as multinuclear Au+ complexes, cofacial stacking of Pt2+ ensembles, Ag+-thiol coordination polymers, and heterometallic complexes. These sensing platforms represent a new scheme that relies on the signalling chromophore in situ generated only when the sensing species is present. |
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