Influence of Tetraazamacrocyclic Ligands on the Nitric Oxide Reactivity of their Cobalt(II) Complexes

Abstract

The reactions of cobalt­(II) complexes of tetraazamacrocyclic tropocoronand (TC) ligands with nitric oxide (NO) were investigated. When [Co­(TC-5,5)] was allowed to react with NO­(g), the {CoNO}<sup>8</sup> mononitrosyl [Co­(NO)­(TC-5,5)] was isolated and structurally characterized. In contrast, a {Co­(NO)<sub>2</sub>}<sup>10</sup> species formed when [Co­(TC-6,6)] was exposed to NO­(g), and the nitrito [Co­(NO<sub>2</sub>)­(TC-6,6)] complex was structurally and spectroscopically characterized from the reaction mixture. The {Co­(NO)<sub>2</sub>}<sup>10</sup> species was assigned as the bis­(cobalt dinitrosyl) complex [Co<sub>2</sub>(NO)<sub>4</sub>(TC-6,6)] by spectroscopic comparison with independently synthesized and characterized material. These results provide the first evidence for the influence of tropocoronand ring size on the nitric oxide reactivity of the cobalt­(II) complexes

    Similar works

    Full text

    thumbnail-image

    Available Versions