A dynamic supramolecular three-component A_nB_mC_l bis-(zinc porphyrin) tweezer has been prepared quantitatively using the HETPHEN concept. Upon addition of nitrogenous spacers of different length, i.e. an extended bipyridine, 4,4’-bipyridine and DABCO, to set up an additional orthogonal binding motif (Zn_Por—N_spacer), three structurally different, still dynamic four-component A_nB_mC_lD_k assemblies were cleanly formed, as indicated by UV-Vis and NMR titrations as well as by DOSY investigations. The structures were identified as a bridged monotweezer A₂BC₂D, a doubly bridged double-tweezer A₄B₂C₄D₂ and a triply bridged double-tweezer A₄B₂C₄D₃, the latter resembling a porphyrin stack. Notably, the same structures were equally formed directly from a mixture of the constituents A,B,C and D put together in any sequence if the correct stoichiometry was applied [1].

[1] R. S. K. Kishore, T. Paululat, M. Schmittel, Chem. Eur. J. 2006, in press.

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