Di-nuclear [{(NN)(CO)₃Re}₂(trans-bpe)](PF₆)₂ complexes, NN = 4,7-diphenyl-1,10-phenanthroline (ph₂phen) or 4,7-dichloro-1,10-phenanthroline (Cl₂phen) and trans-bpe = trans-1,2-bis(4-pyridyl)ethylene, were synthesized and characterized by ¹H NMR and UV-visible spectroscopy. Irradiation of acetonitrile solutions led to ¹H NMR and UV-visible spectral changes ascribed to trans-to-cis photoisomerization processes showing that the presence of another Re(I)-moiety does not preclude the photoisomerization process. Quantum yields for the di-nuclear isomerization of [{(ph₂phen)(CO)₃Re}₂(trans-bpe)]²⁺ were higher than those for the corresponding mono-nuclear compound process. Additionally, the higher quantum yield obtained with 254 nm irradiation for [{(Cl₂phen)(CO)₃Re}₂(trans-bpe)]²⁺ showed, for the first time, that the singlet pathway could also be accessed in addition to the usually observed triplet one. The luminescence in fluid solution observed for the [{(NN)(CO)₃Re}₂(cis-bpe)]²⁺ complexes is able to efficiently photosensitize the generation of singlet O₂.

中文翻译：

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二核rh （i）bpe基化合物的光异构化†

双核[{（（NN）（CO）₃ Re} ₂（反式-bpe）]（PF ₆）₂络合物，NN = 4,7-二苯基-1,10-菲咯啉（ph ₂ phen）或4,7合成了^1-二氯-1,10-菲咯啉（Cl ₂ phen）和反式-bpe =反式-1,2-双（4-吡啶基）乙烯，并通过¹ H NMR和UV-可见光谱进行了表征。的乙腈导致溶液照射¹ H NMR和归属于紫外-可见光谱的变化反式-到-顺光致异构化过程显示出另一个重新的存在（我-部分不排除光异构化过程。[{（（ph ₂ phen）（CO）₃ Re} ₂（反式-bpe）] ^2+的双核异构化的量子产率高于相应的单核化合物过程的量子产率。另外，通过254 nm辐照获得的{{（Cl ₂ phen）（CO）₃ Re} ₂（反式-bpe）] ²⁺更高的量子产率首次表明，单线态路径也可在除了通常观察到的三重态之一。[{（NN）（CO）₃ Re} ₂（顺式-bpe）] ²⁺络合物能够有效地光敏单线态O ₂的产生。