Synthesis and photoinduced electron transfer in platinum(ii) bis(N-(4-ethynylphenyl)carbazole)bipyridine fullerene complexes

Sai Ho Lee, Chris Tsz Leung Chan, Keith Man Chung Wong, Wai Han Lam, Wai Ming Kwok, Vivian Wing Wah Yam

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Platinum(ii) bis(N-(4-ethynylphenyl)carbazole)bipyridine fullerene complexes, (Cbz)2-Pt(bpy)-C60and (tBuCbz)2-Pt(bpy)-C60, were synthesized. Their photophysical properties were studied by electronic absorption and emission spectroscopy and the origin of the transitions was supported by computational studies. The electrochemical properties were also studied and the free energies for charge-separation and charge-recombination processes were evaluated. The photoinduced electron transfer reactions in the triads were investigated by femtosecond and nanosecond transient absorption spectroscopy. In dichloromethane, both triads undergo ultrafast charge separation from the3MLCT/LLCT excited state within 300 fs to yield their respective triplet charge-separated (CS) states, namely (Cbz)2+-Pt(bpy)-C60-and (tBuCbz)2+-Pt(bpy)-C60-, and the CS states would undergo charge recombination to give the3C60∗ state, which subsequently decays to the ground state in 22-28 μs. This journal is
Original languageEnglish
Pages (from-to)17624-17634
Number of pages11
JournalDalton Transactions
Issue number47
Publication statusPublished - 21 Dec 2014

ASJC Scopus subject areas

  • Inorganic Chemistry

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