Dipl.-Chem. Mario Schleep
 | Room No.: 330 (Chemie I) Telephone: +49 (0) 761 203-8716 e-Mail: mario.schleep@ac.uni-freiburg.de Keywords: Tin cations, weakly coordinating anions |
Since there is with [Sn(C7H8)3][B(C6F5)4]2 only one example for a weakly coordinated tin(II) cation without any chelating or strongly coordinating ligand,[1] it is the goal of my research to extent this palette by deploying the weakly coordinating [Al(ORF)4]− or the fluoride-bridged [(RFO)3Al-F-Al(ORF)3]− (with RF = C{CF3}3).
The route used to synthesize [Sn(C7H8)3][B(C6F5)4]2 is not applicable when deploying [Al(ORF)4]−. Therefore, starting materials have to be found allowing a conversion to a comparable weakly coordinated tin(II) cation. A promising candidate is Sn(ORF)2 which could be used in a reaction with the Lewis acid Al(ORF)3:
These complexes of tin(II) should subsequently be used to generate various weakly coordinated complexes of subvalent tin with neutral ligands (see figure 1)
Figure 1: Calculated structures of three examples for weakly coordinated tin(II) cations at the RIBP86/def-SV(P) level of theory. Color scheme: Sn (dark turquoise), C (grey), H (white), P (orange), O (red).
[1] A. Schäfer, F. Winter, W. Saak, D. Haase, R. Pöttgen, T. Müller, Chem. Eur. J. 2011, 17, 10979–10984.