Pentavalent lanthanide nitride-oxides: NPrO and NPrO? complexes with NPr triple bonds?

Chemical Science Pub Date: 2017-03-15 DOI: 10.1039/C7SC00710H

Abstract

The neutral molecule NPrO and its anion NPrO? are produced via co-condensation of laser-ablated praseodymium atoms with nitric oxide in a solid neon matrix. Combined infrared spectroscopy and state-of-the-art quantum chemical calculations confirm that both species are pentavalent praseodymium nitride-oxides with linear structures that contain Pr[triple bond, length as m-dash]N triple bonds and Pr[double bond, length as m-dash]O double bonds. Electronic structure studies show that the neutral NPrO molecule features a 4f0 electron configuration and a Pr(V) oxidation state similar to that of the isoelectronic PrO2+ ion, while its NPrO? anion possesses a 4f1 electron configuration and a Pr(IV) oxidation state. The neutral NPrO molecule is thus a rare lanthanide nitride-oxide species with a Pr(V) oxidation state, which follows the recent identification of the first Pr(V) oxidation state in the PrO2+ and PrO4 complexes (Angew. Chem. Int. Ed., 2016, 55, 6896). This finding indicates that lanthanide compounds with oxidation states of higher than +IV are richer in chemistry than previously recognized.

Graphical abstract: Pentavalent lanthanide nitride-oxides: NPrO and NPrO? complexes with N [[triple bond, length as m-dash]] Pr triple bonds
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