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Penta- and hexaorganostannate(iv) complexes based on O-heterocyclic ligands
Ireen Gebauer1, Daniel Gräsing, Jörg Matysik
1Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany. zeckert@uni-leipzig.de.
Abstract:
In the present study, the synthesis of homoleptic five- and six-coordinate heteroaryl tin(iv) compounds using two O-heterocyclic substituents, 2-furyl (2-fu) and 2-benzofuryl (2-fuBz) ligands is described. The compounds were obtained as their lithium salts [Li2(OEt2)2Sn(2-fu)6] (1), [Li(tmeda)2][Sn(2-fu)5] (tmeda = N,N,N',N'-tetramethylethylenediamine) (2) and [Li(thf)4][Sn(2-fuBz)5] (3), featuring both an intramolecular coordination of the counterions by the anionic hypercoordinate tin(iv) species found in 1 as well as solvent separated cation/anion pairs for compounds 2 and 3. In addition, the co-crystalline complex [K2(thf)6Sn(2-fuBz)6]·[K2(thf)4Sn(2-fuBz)6] (4a·4b) was achieved. The characterization of all compounds by various spectroscopic methods and X-ray structural analysis complemented by density functional computations provided insights into the diversity of complex formation.
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