Preparation and Properties of Cyclopentadienyl Ruthenocenium Complexes with 1,2-Disubstituted Benzene Ligands: Competition between Chelate Coordination and Sandwich Coordination
摘要:
The reactions of [CpRu(NCMe)(3)](+) and 1,2-disubstituted benzene ligands (L) bearing donor substituents were examined to investigate the consequence of competing coordination modes. 1,2-C6H4(OMe)(2) and 1,2-C6H4(SMe)(OMe) produce [CpRu(eta(6)-L)](+)-type sandwich complexes with a eta(6) coordination mode, whereas 1,2-C6H4(SMe)(2) forms the chelate complex [CpRu(kappa(2)-L)(NCMe)](+), due to the coordination ability of the donor atoms. 1,2-C6H4(NMe2)(2) and 1,2-C6H4(SMe)(NMe2) produce the sandwich complexes or the chelate complexes ([CpRu(kappa(2)-L)(NCMe)(n)](+); n = 0 or 1) depending on the reaction conditions. The chelate complexes are the kinetic products and are thermally transformed into the sandwich complexes in solution. The hexafluorophosphate (PF6) and bis-(trifluoromethylsulfonyl)amide (Tf2N) salts were isolated, and their thermal properties were investigated. The Tf2N salts of the sandwich complexes are room-temperature ionic liquids. The molecular structures were determined crystallographically.
Preparation and Properties of Cyclopentadienyl Ruthenocenium Complexes with 1,2-Disubstituted Benzene Ligands: Competition between Chelate Coordination and Sandwich Coordination
摘要:
The reactions of [CpRu(NCMe)(3)](+) and 1,2-disubstituted benzene ligands (L) bearing donor substituents were examined to investigate the consequence of competing coordination modes. 1,2-C6H4(OMe)(2) and 1,2-C6H4(SMe)(OMe) produce [CpRu(eta(6)-L)](+)-type sandwich complexes with a eta(6) coordination mode, whereas 1,2-C6H4(SMe)(2) forms the chelate complex [CpRu(kappa(2)-L)(NCMe)](+), due to the coordination ability of the donor atoms. 1,2-C6H4(NMe2)(2) and 1,2-C6H4(SMe)(NMe2) produce the sandwich complexes or the chelate complexes ([CpRu(kappa(2)-L)(NCMe)(n)](+); n = 0 or 1) depending on the reaction conditions. The chelate complexes are the kinetic products and are thermally transformed into the sandwich complexes in solution. The hexafluorophosphate (PF6) and bis-(trifluoromethylsulfonyl)amide (Tf2N) salts were isolated, and their thermal properties were investigated. The Tf2N salts of the sandwich complexes are room-temperature ionic liquids. The molecular structures were determined crystallographically.