Rhodium dichloro dimer

Watts and coworkers reported the luminescence properties of cyclometalated iridium(III) and rhodium(III) complexes (see Cyclometalation). The dichloro-bridged dimers [M2(N C)4Cl2] (M = Ir, Rh HN C = Hppy, Hbzq) displayed intense emission with structural features in EtOH/MeOH/CH2Cl2 (4 1 1 v v) glass at 77 K. The emission of the rhodium(III) dimers was assigned to an lE excited state... 

Dichloro(T] -pentamethylcyclopentadienyl)rhodium(III) dimer di-p-chloro-dichlorobi (Ti -pentamethyl-... 

The dichlororuthenium arene dimers are conveniently prepared by refluxing ethanolic ruthenium trichloride in the appropriate cyclohexadiene [19]. The di-chloro(pentamethylcyclopentadienyl) rhodium dimer is prepared by refluxing Dewar benzene and rhodium trichloride, whilst the dichloro(pentamethylcyclo-pentadienyl)iridium dimer is prepared by reaction of the cyclopentadiene with iridium trichloride [20]. Alternatively, the complexes can be purchased from most precious-metal suppliers. It should be noted that these ruthenium, rhodium and iridium arenes are all fine, dusty, solids and are potential respiratory sensitizers. Hence, the materials should be handled with great care, especially when weighing or charging operations are being carried out. Appropriate protective clothing and air extraction facilities should be used at all times. 

Reactions of the dichloro-bridged rhodium(ni) and iridium(III) dimers with diimine ligands resulted iu the formation of the luminescent mononuclear complexes [M(N C)2(N N)]+ (M = Ir, Rh = ppy, bzq N N = bpy, phen). The electronic absorption and emission spectra of these complexes are shown in Figure 8. The rhodium(III) complexes displayed very long-lived emission in... 

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