Bridging molecular clusters and fullerene

Abstract

The monochloro derivative {Pt₃}Cl [(1), {Pt₃} = Pt₃(μ-PBu^t₂)₃(CO)₂] was reacted with one equiv. of 4-ethynylbenzaldehyde under Sonogashira dehydrohalogenation conditions to afford {Pt₃}CC–(1,4)C₆H₄–CHO, (3). Under analogous conditions, the condensation of the dichloride {Pt₆}Cl₂ [(2), {Pt₆} = Pt₆(μ-PBu^t₂)₄(CO)₄] with two equiv. of 4-ethynyl-benzaldehyde provided {Pt₆}(CC–(1,4)C₆H₄–CHO)₂, (4). The fulleropyrrolidine derivatives {Pt₃}CC–(1,4)C₆H₄–C₂H₃N(C₈H₁₇)C₆₀, (5), and {Pt₆}(CC–(1,4)C₆H₄–C₂H₃N(C₈H₁₇)C₆₀)₂, (6), were obtained by reacting the formyl clusters 2 and 4 with an appropriate amount of N-octylglycine and C₆₀. Cyclovoltammetric and IR, UV and NIR spectroelectrochemical data suggest the absence of a significant communication between the cluster and the fullerene units in covalent assemblies 5 and 6. The crystal and molecular structure of compound 3 is also reported.