Observation of the room temperature phosphorescence of Bodipy in visible light-harvesting Ru(ii) polyimine complexes and application as triplet photosensitizers for triplet–triplet-annihilation upconversion and photocatalytic oxidation
作者： Wanhua Wu , Jifu Sun , Xiaoneng Cui , Jianzhang Zhao
DOI: 10.1039/C3TC30592A
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摘要: Two Ru(II) polyimine complexes containing a boron-dipyrromethene (Bodipy) chromophore were prepared. The two are different in the linker which connects Bodipy part and coordination centre. core centre π-conjugation Ru-1, whereas Ru-2 is linked non-conjugated way to Ru(bpy)3[PF6]2 (Ru-3) was used as reference complex. Both Ru-1 show strong absorption visible region (e = 65 200 M−1 cm−1 at 528 nm for e 76 700 499 Ru-2). fluorescence of ligands almost completely quenched Ru-2. shows room temperature phosphorescence chromophore, well residual ligand. only A long-lived Bodipy-localized triplet excited state observed both upon light excitation (τT up 279.7 μs, longest T1 lifetime moiety transition metal complex). Application triplet–triplet-annihilation upconversion singlet oxygen (1O2)-mediated photo-oxidation proved that more efficient (e.g. quantum yield ΦΔ 0.93) photosensitizer than (ΦΔ 0.64). Therefore, direct connection π-core centre, i.e. by establishing between light-harvesting essential enhance effective complexes.
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