445241-38-3Relevant academic research and scientific papers
Conformational behavior and coordination chemistry of 2,11-dithia[3.3]orthocyclophane with platinum group metals
Tiburcio, Jorge,Jones, William D.,Loeb, Stephen J.,Torrens, Hugo
, p. 3779 - 3785 (2008/10/08)
The compound 2,11-dithia[3.3]orthocyclophane (L) is a mesocyclic dithioether that can act as a bidentate ligand in different conformations. In the ionic heteroleptic complexes [PtL(η4-cod)][CF3SO3]2 (1), [RhL(η4-cod)][CF3SO3] (2), and [IrL(η4-cod)][CF3SO3] (3) (cod = 1,5-cyclooctadiene), L is coordinated in the anti I conformation both in solution and in the solid state, as revealed by an X-ray diffraction study of complex 1. However, in complexes [PdL- (PPh3)2][SO3CF3]2 (4) and [PtL(PPh3)2][SO3CF3]2 (5), L exhibits two different conformations: anti I and anti II in a 40:60 ratio, as observed by 1H and 31P NMR spectroscopy, with no exchange up to 90 °C. The homoleptic complexes [PdL2][SO3CF3]2 (6) and [PtL2][SO3CF3]2 (7), with two ligands bound to the metal, display two isomers in solution, one of them with L in conformations anti I-anti II and the other with conformations anti II-anti II with a 75:25 ratio. The X-ray structure of 6 showed only the presence of the anti II-anti II isomer in the solid state. All complexes were synthesized by the reaction of a suitable chloride complex with 2 equiv of silver triflate and 1 equiv of L.
