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The Role of 2,6‐Diaminopyridine Ligands in the Isolation of an Unprecedented, Low‐Valent Tin Complex
Author(s) -
Flock Johanna,
Suljanovic Amra,
Torvisco Ana,
Schoefberger Wolfgang,
Gerke Birgit,
Pöttgen Rainer,
Fischer Roland C.,
Flock Michaela
Publication year - 2013
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201301340
Subject(s) - tin , chemistry , transamination , oxidation state , molecule , transition metal , ligand (biochemistry) , enamine , metal , ion , crystallography , stereochemistry , medicinal chemistry , catalysis , organic chemistry , biochemistry , receptor , enzyme
Stabilization of the central atom in an oxidation state of zero through coordination of neutral ligands is a common bonding motif in transition‐metal chemistry. However, the stabilization of main‐group elements in an oxidation state of zero by neutral ligands is rare. Herein, we report that the transamination reaction of the DAMPY ligand system (DAMPY=2,6‐[ArNH‐CH 2 ] 2 (NC 5 H 3 ) (Ar=C 6 H 3 ‐2,6‐ i Pr 2 )) with Sn[N(SiMe 3 ) 2 ] 2 produces the DIMPYSn complex (DIMPY=(2,6‐[ArNCH] 2 (NC 5 H 3 )) with the Sn atom in a formal oxidation state of zero. This is the first example of a tin compound stabilized in a formal oxidation state of zero by only one donor molecule. Furthermore, three related low‐valent Sn II complexes, including a [DIMPYSn II Cl] + [SnCl 3 ] − ion pair, a bisstannylene DAMPY{Sn II [N(SiMe 3 ) 2 ] 2 } 2 , and the enamine complex MeDIMPYSn II , were isolated. Experimental results and the conclusions drawn are also supported by theoretical studies at the density functional level of theory and 119 Sn Mössbauer spectroscopy.