Synthesis and Photochemical Properties of a Novel Iron−Sulfur−Nitrosyl Cluster Derivatized with the Pendant Chromophore Protoporphyrin IX1

Publisher Website
Google Scholar
Abstract
The novel Roussin red-salt ester (PPIX-RSE) with a pendant porphyrin chromophore was prepared and investigated as a precursor for the photochemical generation of nitric oxide. PPIX-RSE has the general formula Fe2(NO)4{(μ-S,μ-S‘)P} (where (S,S‘)P is the bis(2-thiolatoethyl) diester of protoporphyrin IX. The photoexcitation of PPIX-RSE with 436- or 546-nm light in an aerated chloroform solution led to the photodecomposition of the cluster with the respective quantum yields (5.2 ± 0.7) × 10-4 and (2.5 ± 0.5 × 10-4) and the concomitant release of NO. PPIX-RSE is a significantly more effective NO generator at longer wavelength excitation than are other Fe2(μ-SR)2(NO)4 esters for which R is a simple alkyl group such as CH3CH2− because of the much higher absorptivity of the pendant PPIX chromophore at these wavelengths and a modestly higher quantum yield. Fluorescence intensity and lifetime data indicate that the photoexcited porphyrin of PPIX-RSE is largely quenched by the energy transfer to the Fe2S2(NO)4 cluster's core. However, a small fraction of this emission is not quenched, and it is proposed that PPIX-RSE may exist in solution as two conformers.