Coordination of two 2,2′-bisdipyrrin ligands, bearing methyl ester or methylthioether peripheral groups, with Zn(II) cations leads not only to the formation of the expected linear helicates but also concomitantly to novel tri- and tetra-nuclear circular species that have been isolated and fully characterized in solution and by X-ray diffraction.
S. A. Baudron, H. Ruffin and M. W. Hosseini, Chem. Commun., 2015, 51, 5906 DOI: 10.1039/C5CC00724K
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