Recent Developments in the Chemistry of Covalent Azides

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Abstract
The experimental and theoretical chemistry of covalently bound azides is an area that has seen considerable renaissance over the past 10 years. This review is not exhaustive in scope but rather focuses on and highlights certain aspects in this field. In particular, the stability and dissociation of HN3is discussed at a very high level of theory (CASSCF and MCSCF‐CI) and compared and contrasted with experimental data and results from „medium”︁‐level ab initio computations (MP2, B‐LYP). From these results credence is given to those values calculated for larger systems and heavy elements for which very high level computations are not possible. The experimentally well‐characterized covalent halogen azides (XN3, where X = F, Cl, Br, I) as well as the heavy‐element group‐15 compound Sb(N3)3are discussed. The review also includes discussion of the bond properties of the highly unstable N‐bound azides ON–N3and (FSO2)2N–N3. In the final chapter attention is drawn to the recently predicted and eventually experimentally verified elusive species OCN–NCO, which is isoelectronic to the hitherto unknown diazide N6.