Organometallic boxes built from 5,10,15,20-tetra(4-pyridyl)porphyrin panels and hydroxyquinonato-bridged diruthenium clips

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Abstract

Self-assembly of 5,10,15,20-tetra(4-pyridyl)porphyrin (tpp-H2) tetradentate panels with dinuclear arene ruthenium clips [Ru26-arene)2(dhbq)Cl2] (arene = C6H5Me, p-PriC6H4Me, C6Me6; dhbq = 2,5-dihydroxy-1,4-benzoquinonato) affords the cationic organometallic boxes [Ru86-C6H5Me)8(tpp-H2)2(dhbq)4]8+ ([1]8+), [Ru86-p-PriC6H4Me)8(tpp-H2)2(dhbq)4]8+ ([2]8+) and [Ru86-C6Me6)8(tpp-H2)2(dhbq)4]8+ ([3]8+). These octanuclear cations have been isolated as their triflate salts and characterised by mass spectrometry, NMR and IR spectroscopy. The molecular structure of these systems was deduced by one-dimensional and two-dimensional NMR experiments (ROESY, COSY, HSQC).

Graphical abstract

Self-assembly of 5,10,15,20-tetra(4-pyridyl)porphyrin tetradentate panels with dinuclear arene ruthenium clips [Ru26-arene)2(dhbq)Cl2] (arene = C6H5Me, p-PriC6H4Me, C6Me6; dhbq = 2,5-dihydroxy-1,4-benzoquinonato) affords the cationic organometallic boxes of the general formula [Ru86-arene)8(tpp-H2)2(dhbq)4]8+. These cationic cages are isolated as their triflate salts and characterised by mass spectrometry, NMR and IR spectroscopy. The molecular structure was deduced by one and two-dimensional NMR experiments.

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Acknowledgements

We are grateful to the Fonds National Suisse de la Recherche Scientifique (Grant 200020-119760). A generous loan of ruthenium chloride hydrate from the Johnson Matthey Technology Centre is gratefully acknowledged.

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