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Dimethylaluminum and gallium amino alkoxides |
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| Authors: | Karl-Heinz Thiele Elmar Hecht Thomas Gelbrich Ulf Dümichen |
| Institution: | aInstitut de Ciència de Materials de Barcelona, Campus U.A.B., E-08193, Bellaterra, Spain bDepartment of Chemistry, University of Turku, FIN-20500 Turku, Finland cDepartment of Chemistry, PO Box 55, University of Helsinki, FIN-00014 Helsinki, Finland |
| Abstract: | An S,S′-thioether—thioester chelating ligand 7,8-μ-SCH2C(O)S-7,8-C2B9H10]? (L1), incorporating the unit —(C)2B9H10]? has been synthesized. Reactions have been conducted with RhCl(PPh3)3 and PdCl2(PPh3)2 complexes in ethanol. With Rh, L1 maintains its original cyclic nature and most probably chelation via thioether—thioester takes place. The carborane negative charge may stabilize this original thioether—thioester complex. The other two Rh positions are occupied by two PPh3 ancillary ligands forming Rh(L1)(PPh3)2]. The reaction of L1 with Pd induces ligand modifications and the cyclic nature of L1 is lost. A transesterification process leading to a dianionic ligand L2, 7-S-8-SCH2C(O)OCH2CH3?7,8-C2B9H10]2? has taken place. In this way L2 is capable of compensating the dipositive Pd charge. The other two Pd positions are occupied by two PPh3. This reaction has been extended to methanol and isopropanol solvents. The crystal structure of Pd(L2)(PPh3)2] has been determined. |
| Keywords: | Carborane Cluster Palladium Rhodium Metalloboranes Thiolate |
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