Polychromophoric metal complexes for generating the bioregulatory agent nitric oxide by single- and two-photon excitation

Accounts of Chemical Research
Peter C Ford

Abstract

In order to deliver a bioactive agent to a physiological location, it is important to be able to regulate precisely the location and the dosage. Such exquisite control can easily be envisioned for a photochemical drug that is active toward release of the desired bioactive agent upon irradiation of a specific tissue site. These materials should be thermally stable but reactive under excitation at visible (vis) or near-infrared (NIR) wavelengths where tissue transmission is optimal. Two photon excitation (TPE) is of special interest, since the use of focused laser pulses to activate release could provide 3D spatial control in therapeutic applications. This Account describes the preparation and photochemistry of a series of transition metal complexes designed to release the simple bioregulatory compound nitric oxide upon vis or NIR excitation. In order to enhance the light gathering capability of such compounds, we have attached chromophores with high single- or two-photon absorption cross sections to several photochemical NO precursors. For example, the iron nitrosyl clusters Fe2(mu-SR)2(NO)4 (Roussin's red esters) have been prepared with various chromophores as pendant groups, an example being the protoporphyrin XI derivative il...Continue Reading

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Citations

Sep 1, 2009·Chemical Reviews·Kathryn L Haas, Katherine J Franz
Apr 12, 2011·Inorganic Chemistry·Alexis D OstrowskiPeter C Ford
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