Synthesis and crystal structures of two new tin bis-(carboranylamidinate) complexes

Nicole Harmgarth; Phil Liebing; Philipp Hillebrand; Sabine Busse; Frank T Edelmann

doi:10.1107/S2056989017012671

Synthesis and crystal structures of two new tin bis-(carboranylamidinate) complexes

Acta Crystallogr E Crystallogr Commun. 2017 Sep 12;73(Pt 10):1443-1448. doi: 10.1107/S2056989017012671. eCollection 2017 Oct 1.

Authors

Nicole Harmgarth¹, Phil Liebing², Philipp Hillebrand¹, Sabine Busse¹, Frank T Edelmann¹

Affiliations

¹ Chemisches Institut der Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany.
² ETH Zurich, Laboratory for Inorganic Chemistry, Vladimir-Prelog-Weg 1-5/10, 8093, Zurich, Switzerland.

Abstract

Reaction of 2 equiv. of the lithium carboranylamidinate Li[o-(C₂H₁₀B₁₀)C(NCy)(NHCy)] with SnCl₂ in THF afforded the stannylene compound bis(N,N'-dicyclohexylamidinatocarboranate)tin(II), Sn^II[o-(C₂H₁₀B₁₀)C(NCy)(NHCy)]₂ (1). A similar reaction of SnCl₄ with 2 equiv. of Li[o-(C₂H₁₀B₁₀)C(N ⁱ Pr)(NH ⁱ Pr)] unexpectedly afforded the known solvated penta-chlorido-stannate(IV) salt [Li(THF)₄][SnCl₅(THF)] as the main reaction product. Small amounts of the new chlorido-tin(IV) bis-(carboranylamidinate) bis(N,N'-diiso-propylamidinatocarboranate)chloridotin(IV), Sn^IVCl[o-(C₂H₁₀B₁₀)C(N ⁱ Pr)(NH ⁱ Pr)][o-(C₂H₁₀B₁₀)C(N ⁱ Pr)₂] (2), were isolated as a by-product. Single-crystal X-ray structure analysis revealed a κC,κN-chelating coordination of the carboranylamidinate ligands in both 1 and 2. The Sn atom in 1 adopts a pseudo-trigonal-bipyramidal coordination under participation of a stereoactive lone pair. In 2, a trigonal-bipyramidal coordination of Sn is completed by a chlorido ligand.

Keywords: amidinate; carborane; carboranylamidinate; crystal structure; tin.