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Issue 12, 2011
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Self-assembly of new fluorescent Pd(ii) and Pt(ii) 2,7-diazapyrenium-based metallocycles and study of their inclusion complexes and [3]catenanes

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Abstract

New fluorescent square-shaped metallocycles were self-assembled from N-monoalkyl-2,7-diazapyrenium derivatives 1 and 4 and PdII/PtII complexes. Using ligand 1, the metal-directed self-assembly process produced a single metallocycle, while the non-symmetrical salt 4 produced mixtures of regioisomeric PdII and PtII metallocycles upon complexation with the corresponding square-planar cis-complexes. Due to the improved π-deficient character of 1 and 4 compared to related bipyridinium-based ligands, complexation and catenation of the obtained metallocycles with selected electron-rich aromatic substrates produced the corresponding 1 : 2 inclusion complexes and [3]catenanes in a highly efficient fashion. This is particularly relevant for metallocycles derived from ligand 4, as complexation and catenation occurs in a regioselective fashion, generating only the supramolecules with the appropriate parallel arrangement of the diazapyrenium subunits in order to maximize the host–guest π-stacking interactions. The potential of the new metallocycles for optical signalling applications is illustrated by analyzing their absorption and emission behaviour upon complexation and catenation.

Graphical abstract: Self-assembly of new fluorescent Pd(ii) and Pt(ii) 2,7-diazapyrenium-based metallocycles and study of their inclusion complexes and [3]catenanes

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Publication details

The article was received on 27 Jul 2011, accepted on 25 Aug 2011 and first published on 08 Sep 2011


Article type: Edge Article
DOI: 10.1039/C1SC00508A
Chem. Sci., 2011,2, 2407-2416

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    Self-assembly of new fluorescent Pd(II) and Pt(II) 2,7-diazapyrenium-based metallocycles and study of their inclusion complexes and [3]catenanes

    V. Blanco, M. D. García, C. Peinador and J. M. Quintela, Chem. Sci., 2011, 2, 2407
    DOI: 10.1039/C1SC00508A

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