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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Diradicaloid or Zwitterionic Character: The Non-Tetrahedral Unsaturated Compound [Si-4[N(SiMe3) Dipp](4)] with a Butterfly-type Si-4 Substructure

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Keuter, Jan [1] ; Schwedtmann, Kevin [1] ; Hepp, Alexander [1] ; Bergander, Klaus [2, 3] ; Janka, Oliver [1] ; Doerenkamp, Carsten [4, 5] ; Eckert, Hellmut [4, 5] ; Mueck-Lichtenfeld, Christian [2, 3] ; Lips, Felicitas [1]
Total Authors: 9
[1] Westfalische Wilhelms Univ Munster, Inst Anorgan & Analyt Chem, Corrensstr 28-30, D-48149 Munster - Germany
[2] Westfalische Wilhelms Univ Munster, Organ Chem Inst, Corrensstr 40, D-48149 Munster - Germany
[3] Westfalische Wilhelms Univ Munster, Ctr Multiscale Theory & Computat, Corrensstr 40, D-48149 Munster - Germany
[4] Westfalische Wilhelms Univ Munster, Inst Phys Chem, Corrensstr 28-30, D-48149 Munster - Germany
[5] Univ Sao Paulo, Inst Fis Sao Carlos, Ave Trabalhador Saocarlense 400, BR-13566590 Sao Carlos, SP - Brazil
Total Affiliations: 5
Document type: Journal article
Source: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION; v. 56, n. 44, p. 13866-13871, OCT 23 2017.
Web of Science Citations: 4

The reduction of the tribromoamidosilane [N(SiMe3) Dipp] SiBr3 (Dipp= 2,6-iPr(2)C(6)H(3)) with potassium graphite or magnesium resulted in the formation of {[}Si-4[N-(SiMe3) Dipp](4)] (1), a bicyclo{[}1.1.0] tetrasilatetraamide. The Si-4 motif in 1 does not adopt a tetrahedral substructure and exhibits two three-coordinate and two four-coordinate silicon atoms. The electronic situation on the three-coordinate silicon atoms is rationalized with positive and negative polarization based on EPR analysis, magnetization measurements, and DFT calculations as well as 29Si CP MAS NMR and multinuclear NMR spectroscopy in solution. Reactivity studies with 1 and radical scavengers confirmed the partial charge separation. Compound 1 reacts with sulfur to give a novel type of silicon sulfur cage compound substituted with an amido ligand, {[}Si-4[N-(SiMe3) Dipp](4)](2). (AU)

FAPESP's process: 17/06649-0 - New Optical Materials based on Rare-Earth Doped Oxyfluoride Glasses and Ceramics: Structural Studies by Electron Paramagnetic Resonance Methods
Grantee:Carsten Doerenkamp
Support type: Scholarships in Brazil - Post-Doctorate