The stable selenodiimide complex SnCl4[(ButN![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
)2Se]1 has been prepared from Se[NBut(SiMe3)]2 and SnCl4, and also by treating the unstable (ButN)2Se (obtained from NButH2 and SeCl4) with SnCl4; the crystal structure of 1·2thf indicates appreciable SeN double-bond character [171.0(3) pm] but also shows that the selenium atom is unexpectedly co-ordinated by the two tetrahydrofuran (thf) oxygens.
J. Gindl, M. Björgvinsson, H. W. Roesky, C. Freire-Erdbrügger and G. M. Sheldrick, J. Chem. Soc., Dalton Trans., 1993, 811 DOI: 10.1039/DT9930000811
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