Abstract: | On Surface Compounds of Transition Metals. VIII. Complex Formation of a Coordinatively Unsaturated CrII Surface Compound with Nitrogen Oxides N2O forms with surface-Cr(II) a relatively unstable light blue compound of the stoichiometry 1:1, while addition of NO results in formation of a very stable dark brown, diamagnetic surface complex . By reaction with O2 this complex undergoes — depending on reaction temperature — either replacement of NO unter reoxidation of the metal (→Cr(VI)) or/and reaction of the ligand (→NO2). Direct reaction of NO2 with results in the same products as stepwise addition of NO and 1/2 O2. reacts with HCl/ROH under formation of the soluble, paramagnetic kation [Cr(NO)(ROH)n]2+, which is formulated as [Cr(II)(NO)]2+ ? [Cr(I)(NO+)]2+ accordingly to the e.s.r. spectra. |