Abstract

The complex pentaaquanitrolsylchromium(2+) sulfate, [Cr(OH 2) 5(NO)]SO 4 has been prepared in a high yield by the hydrolysis of [Cr(NCCH 3) 5(NO)](BF 4) 2 in dilute sulfuric acid. Crystals of [Cr(OH 2) 5(NO)]SO 4 · H 2O have been grown and characterized by X-ray crystallography. Continuous photolysis of [Cr(NCCH 3) 5(NO)] 2+ in acetonitrile solution with 404 nm light results in a release of NO with the quantum yield Φ = 0.55 mol einstein −1 at 298 K with the resulting solvated Cr 2+ ion being trapped by molecular dioxygen present in the solution.

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