Author(s)

Carolina von Eßen¹, Iris M. Oppel²

¹Department of Organic Chemistry, University of Jyväskylä, Jyväskylä, Finland.
²Institute for Inorganic Chemistry, RWTH Aachen, Aachen, Germany.

This contribution describes the synthesis and structural characterization of a triaminoguanidinium (TAG)-based ligand [H₆(OMe)₃L_imin]BF₄ (1) containing imine bonds (L_imin) and its reduction with a dimethylamino borane complex to the corresponding amine compound (L_amin)[H₉(OMe)₃L_amin]OTs (2). In solution, both ligands are C₃-symmetric but crystal structures show the great influence of the reduction on the molecular structure. We show that the planar imine ligand is converted to a highly flexible compound which has nine potential coordination sites, three phenoxy and six amine donors, for binding metal ions. First solid state structures of 1:1 (metal:ligand) coordination compounds with Sn^IV and Zr^IV are presented. Sn^IV exhibits an octahedral coordination sphere and is bound in a facial [ONN] coordination pocket. Zr^IV is pentagonal bipyramidal coordinated and the ligand stabilizes this with its’ [ONNO] binding sites.

Reduction, Triaminoguanidinium, [ONN]/[ONNO] Binding Pockets, Sn^IV Complex, Zr^IV Complex

Eßen, C. and Oppel, I. (2017) Sn^IV and Zr^IV Compounds of a C₃-Symmetric Ligand with Amine [ONN] and [ONNO] Coordination Sites. International Journal of Organic Chemistry, 7, 325-335. doi: 10.4236/ijoc.2017.74027.