Synthetic and structural studies on transition metal fullerene complexes containing phosphorus and arsenic ligands:: Crystal and molecular structures of (η2-C60)M(dppf) (dppf=1,1'-bis(diphenylphosphino)ferrocene; M = Pt, Pd), (η2-C60)Pt(AsPh3)2, (η2-C60)Pt(dpaf) (dpaf=1,1'-bis(diphenylarsino)ferrocene), and (η2-C70)Pt(dpaf)

The reactions of C-60 or C-70 with M(PPh3)(4) (M = Pt, Pd) in toluene or chlorobenzene at room temperature followed by in situ treatment of the intermediates (eta(2)-C-60)M(PPh3)(2) (1, M = Pt; 2, M = Pd) or (eta(2)-C-70)M(PPh3)(2) (3, M = Pt; 4, M = Pd) with dppf produced the corresponding bimetallic fullerene complexes (eta(2)-C-60)M(dppf) (5, M = Pt; 6, M = Pd) and (eta(2)-C-70)M(dppf) (7, M = Pt; 8, M = Pd). In addition, the reaction of C-60 or C-70 with Pt(AsPh3)(4) and the reaction of C-60 or C-70 with Pt(dba)(2) (dba = dibenzylideneacetone) and AsPh3 in toluene at room temperature both afforded the AsPh3-containing fullerene complexes (eta(2)-C-60)Pt(AsPh3)(2) (9) and (eta(2)-C-70)Pt(AsPh3)(2) (10), whereas both the reaction of the isolated 9 or 10 with diarsine ligand dpaf and the reaction of Pt(AsPh3)(4) with C-60 or C-70 followed by in situ treatment of the intermediates 9 and 10 with dpaf in toluene at room temperature yielded the dpaf-containing bimetallic fullerene complexes (eta(2)-C-60)Pt(dpaf) (11) and (eta(2)-C-70)Pt(dpaf) (12).