Title: Photochemical reactions of metal nitrosyl complexes. Mechanisms of NO reactions with biologically relevant metal centers

Abstract

The discoveries that nitric oxide (a.k.a. nitrogen monoxide) serves important roles in mammalian bioregulation and immunology have stimulated intense interest in the chemistry and biochemistry of NO and derivatives such as metal nitrosyl complexes. Also of interest are strategies to deliver NO to biological targets on demand. One such strategy would be to employ a precursor which displays relatively low thermal reactivity but is photochemically active to release NO. This proposition led us to investigate laser flash and continuous photolysis kinetics of nitrosyl complexes such as the Roussin's iron-sulfur-nitrosyl cluster anions ${\text{Fe}}_{\text{2}}{\text{S}}_{\text{2}}{\left(\text{NO}\right)}_{4}2-$ and ${\text{Fe}}_{\text{4}}{\text{S}}_{\text{3}}{\left(\text{NO}\right)}_7-$ and several ruthenium salen and porphyrin nitrosyls. These include studies using metal-nitrosyl photochemistry as a vehicle for delivering NO to hypoxic cell cultures in order to sensitize $\gamma$ -radiation damage. Also studied were the rates and mechanisms of NO “on” reactions with model water soluble heme compounds, the ferriheme protein met-myoglobin and various ruthenium complexes using ns laser flash photolysis techniques. An overview of these studies is presented.

Authors:

Ford, Peter C. ^[1]

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+ Show Author Affiliations

1. Department of Chemistry, University of California, Santa Barbara, CA 93106, USA

Publication Date:

Mon Jan 01 00:00:00 EST 2001

Sponsoring Org.:

USDOE

OSTI Identifier:

1198211

Grant/Contract Number:  

FG-05-91ER79039

Resource Type:

Published Article

Journal Name:

International Journal of Photoenergy

Additional Journal Information:

Journal Name: International Journal of Photoenergy Journal Volume: 3 Journal Issue: 3; Journal ID: ISSN 1110-662X

Publisher:

Hindawi Publishing Corporation

Country of Publication:

Egypt

Language:

English