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J Phys Chem B. 2006 Aug 24;110(33):16781-6.

Photoluminescence of a covalent assembled porphyrin-based monolayer: optical behavior in the presence of O2.

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  • 1Dipartimento di Scienze Chimiche, Universit√† di Catania, and I.N.S.T.M. UdR of Catania, Viale Andrea Doria 6, 95125 Catania, Italy.


The optical O(2) recognition capability of a covalently assembled monolayer (CAM) of 5,10,15-tri-{p-dodecanoxyphenyl}-20-(p-hydroxyphenyl) porphyrin on silica-based substrates was studied at room temperature by both UV-vis and photoluminescence (PL) measurements. The optical properties of this robust monolayer setup appear to be highly sensitive to the O(2) concentration in N(2). Both UV-vis and PL measurements were used to study the porphyrin-oxygen interactions. The monolayer-based sensor exhibits a short response time and can be restored within seconds. The oxygen-induced luminescence quenching of the monolayer involves both ground and excited states. The proposed mechanism responsible for the luminescence quenching involves different kinds of interactions between the monolayer and O(2).

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