Metallation of a cyclic chlorophyll hetero-dyad, and the optical properties of synthetic metallo-dyads

Metallation of a cyclic chlorophyll hetero-dyad, and the optical properties of synthetic... A cyclic chlorophyll hetero-dyad 1-H2H2, prepared by double ester linking of two structurally different pyropheophorbide-a moieties through 3-CH2OCO-132′ and 172-COOCH2-3′, was metallated with zinc and copper to give mono and di-metallated complexes 1-MH2 or 1-H2M and 1-MM. The metallation proceeded stepwise and regioselectively, with predominant synthesis of one of the two mono-metallated complexes 1-MH2 as intermediate. The di-zinc complex produced, 1-ZnZn, was demetallated exclusively via the same mono-zinc complex 1-ZnH2 as was the major intermediate during metallation. Visible and/or circular dichroism spectra of 1-H2H2, 1-MH2, 1-H2M, and 1-MM (M = Ni, Cu, or Zn) were measured in organic solvents. Intramolecular interaction of chlorin chromophores is discussed and compared with that of the corresponding monomeric species. Research on Chemical Intermediates Springer Journals

Metallation of a cyclic chlorophyll hetero-dyad, and the optical properties of synthetic metallo-dyads

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Springer Netherlands
Copyright © 2012 by Springer Science+Business Media B.V.
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
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