title: Controlled photochemical release of nitric oxide from O2-benzyl-substituted diazeniumdiolates.
abstract: An investigation of potential photosensitive protecting groups for diazeniumdiolates (R2N-N(O)=NO-) has been initiated, and here the effect of meta electron-donating groups on the photochemistry of O2-benzyl-substituted diazeniumdiolates (R2N-N(O)=NOCH2Ar) is reported. Photolysis of the parent benzyl derivative (Ar = Ph) results almost exclusively in undesired photochemistry-the formation of nitrosamine and an oxynitrene intermediate with very little, if any, photorelease of the diazeniumdiolate. We have been able to use meta substitution to tune the photochemistry of these benzylic systems. The desired diazeniumdiolate photorelease has been shown to become more substantial with stronger pi-donating meta substituents. This effect has been verified by direct observation of the photoreleased diazeniumdiolate with 1H NMR spectroscopy and by NO quantification measurements conducted in high- and low-pH solutions. In addition, the observed rates of NO release are consistent with that expected for normal thermal decomposition of the diazeniumdiolate in aqueous solutions and also show the same pH dependence.
authors.affiliation: Department of Chemistry, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, USA.
authors.forename: Patrick H
authors.initials: PH
authors.lastname: Ruane
authors.forename: K Mani
authors.initials: KM
authors.lastname: Bushan
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Pavlos
authors.forename: Raechelle A
authors.initials: RA
authors.lastname: D'Sa
authors.forename: John P
authors.initials: JP
authors.lastname: Toscano
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D001593:Benzyl Compounds / Q000737:chemistry*; D007700:Kinetics; D009569:Nitric Oxide / Q000737:chemistry*; D010782:Photolysis
chemical_list: D001391:Azo Compounds; D001593:Benzyl Compounds; C452539:diazeniumdiolate; D009569:Nitric Oxide