Rhenium complexes thermal stability

Bruce and co-workers demonstrated mesomorphism in benzylideneaniline complexes bound to octahedral Mn(l) and Re(l), providing that the imine ligand was sufficiently anisotropic these complexes were the first simple octahedral complexes to show N and lamellar phases. They were formed by the or/.4o-metallation reaction of the imine with [MMe(GO)s] (M = Mn, Re). The parent ligands showed smectic and nematic phases at temperatures up to 300 °C, whereas on complexation to Mn(l), only a nematic phase was seen for 11 (11 M = Mn, = 5, 7) and 12 (12 M = Mn X = Y = H n = m = 8) which cleared below 190 °C with decomposition. The related Re(l) complexes yielded materials with very similar transition temperatures and enhanced thermal stability, so that decomposition was not observed at the clearing point.Therefore, in the following part of this study, only rhenium complexes were studied. 

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