Energy‐transfer cassettes consisting of naphthaleneimide‐fused metalloporphyrin acceptors (M=Zn and Pd) and BODIPY donors have been designed and synthesized. These systems have rigid pseudo‐tetrahedral structures with a donor‐acceptor separation of ca. 17.5 Å. Spectroscopic investigations, including femtosecond transient absorption measurements, showed efficient excitation energy transfer (EET) occurring according to the Förster mechanism. Strong fluorescence of the donor units and significant spectral overlap of the donor and acceptor subunits are prerequisites for the efficient EET in these systems.

Efficient energy and electron transfer in photoexcited dye assemblies is of fundamental importance in both biological and artificial light‐harvesting systems. Efficient transfer according to the Förster mechanism is now reported in multi‐chromophore cassettes consisting of four BODIPY units rigidly linked to a pseudo‐tetrahedral acceptor dye. This central chromophore was obtained by fusing porphyrin and perylenediimide motifs and displays strong absorption extending into the near infrared. More information can be found in the Communication by Dongho Kim, Marcin Stępień et al.

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