Photo-induced translocation of a Pd-n moiety (n=2, 7) on a conjugated polyene ligand

摘要

Extended contiguous multiple pi-coordination (CM pi C) bonds play key roles at the molecular interface between extended pi-conjugated sp(2)-carbon frameworks and metal clusters. However, their bond-rearrangement behavior including metal-translocation on an extended sp(2)-carbon framework has not been well understood. We found that a Pd-2 moiety in a bis-tetraene sandwich complex shows metal-translocation either under thermal- or under photo-irradiation conditions, where the molar ratio of the isomers derived from metal-translocation is switchable through interconversion between the thermal equilibrium state and the photo-stationary state. Furthermore, an extended Pd-7 chain sandwich complex having extended mu(7)-CM pi C bonds undergoes metal-translocation on a carotene ligand under photo-irradiation conditions.