Synthesis and crystal structure of an analogue of the uranyl(VI) ion, containing a linear OUN– group

Abstract

The crystal structure of the air-stable compound PPh₄⁺[UOCl₄{NP(m-Tol)₃}]^–(m-Tol = C₆H₄Me-m) shows that it contains a linear (179°) OUN–group, with U–O and U–N distances of 176 and 190 pm respectively, coordinated by four chlorine atoms; the U–O distance is typical of uranyl compounds, and the U–N distance suggests a bond order >2.