Please use this identifier to cite or link to this item: doi:10.22028/D291-23850
Title: Group 14 metallated 6-amino-1-azafulvene dimers : evidence for a double intramolecular nitrogen-tin interaction
Author(s): Veith, Michael
Zimmer, Michael
Huch, Volker
Denat, F.
Gaspard-Ilonghmane, H.
Dubac, J.
Language: English
Year of Publication: 1993
OPUS Source: Organometallics. - 12. 1993, S. 1012-1015
SWD key words: NMR-Spektroskopie
DDC notations: 540 Chemistry
Publikation type: Journal Article
Abstract: The structures of group 14 C-metalated 6-amino-1-azafulvene dimers have been investigated in solution and in the solid state by NMR spectroscopy. For one of these compounds, 5,10-bis(dimethylamino)-3,8-bis(trimethylstannyl)-5H,10H-dipyrrolo[1,2-a: 1',2'-d]-pyrazine (2c), the molecular structure in the solid state has been determined by X-ray diffractometry. The two tin centers have a distorted-trigonal-bipyramidal co-ordination geometry with the more electronegative N ligand at a pseudoaxial position, resulting in one of the longest known Sn - N interactions: 3.101 (5) A°. Moreover, the temperature-dependent 13C CP-MAS NMR spectrum of this compound shows an appreciable narrowing of the Me3Sn signal between 296 and 333 K. By comparison with nonmetalated analogs or with isomer 5c, the nonreactivity of compound 2c toward hydrolytic decomposition into corresponding 5-(trimethylstannyl)-pyrrole-2-carbaldehyde (3c) may be the result of stabilization of the dimeric form 2c by a double Sn - N interaction. In silicon and germanium analogs (2a, 2b) the Si(Ge) - N interaction is weaker.
Link to this record: urn:nbn:de:bsz:291-scidok-18145
Date of registration: 4-Dec-2008
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
NT - Chemie
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