• An Electrochemical and Photophysical Study of a Covalently Linked Inorganic–Organic Dyad
    A. Kahnt, L.-P. Heiniger, S.-X. Liu, X. Tu, Z. Zheng, A. Hauser, S. Decurtins and D.M. Guldi
    ChemPhysChem, 11 (2010), p651-658
    DOI:10.1002/cphc.200900728 | unige:6465 | Abstract | Article PDF
A molecular donor-acceptor dyad comprising a hexarhenium cluster core, [Re63-Se)8]2+, and a fullerene moiety which are covalently linked through a pyridine ligand was synthesized and fully characterized. The electrochemical and photophysical properties are reported. The detailed study includes cyclic voltammetry, steady-state absorption and fluorescence spectroscopy, radiation chemistry and transient absorption spectroscopy. A light-induced electron transfer between the inorganic cluster moiety and the fullerene can be excluded. However, a light-induced energy transfer from the rhenium cluster to the fullerene is proposed.
  • Photoinduced Energy Transfer Processes within Dyads of Metallophthalocyanines Compactly Fused to a Ruthenium(II) Polypyridine Chromophore
    M. Haas, S.-X. Liu, A. Kahnt, C. Leiggener, D.M. Guldi, A. Hauser and S. Decurtins
    Journal of Organic Chemistry, 72 (20) (2007), p7533-7543
    DOI:10.1021/jo0710477 | unige:3188 | Abstract | Article HTML | Article PDF
An unsymmetric, peripherally octasubstituted phthalocyanine (Pc) 1, which contains a combination of dipyrido[3,2-f:2‘,3‘-h] quinoxaline and 3,5-di-tert-butylphenoxy substituents, has been obtained via a statistical condensation reaction of two corresponding phthalonitriles. Synthetic procedures for the selective metalation of the macrocyclic cavity and the periphery of 1 were developed, leading to the preparation of the key precursor metallophthalocyanines 35 in good yields. Two different strategies were applied to the synthesis of compact dyads MPc−Ru(II) 68 (M = Mg(II), Co(II), Zn(II)). Intramolecular electronic interactions in these dyads were studied by absorption, emission, and transient absorption spectroscopy. Upon photoexcitation, these dyads exhibit efficient intramolecular energy transfer from the Ru(II) chromophore to the MPc moiety.



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