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Issue 57, 2019
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Linkage induced enhancement of fluorescence in metal–carbene bond directed metallacycles and metallacages

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Abstract

Two new 1,4-dihydropyrrolo[3,2-b]pyrrole based aggregation induced emission (AIE)-inactive di- and tetra-imidazolium salts were employed with Ag(I) for the synthesis of a Ag–carbene bond directed metallacycle (1) and metallacage (2), respectively. Transmetalation of these complexes allowed their facile conversion to their respective Au(I)-metallacycle (3) and metallacage (4). The final assemblies exhibit linkage induced enhancement of fluorescence (LIEF). The free ligands are almost non-fluorescent (ΦF = 3.2, 3.4) in comparison to their metal–carbene counterparts (ΦF up to 32.0). Thus, without using any AIEgen, obtaining high emission efficiencies in complexes AgI–CNHC (1, 2) via linkage is a nice approach towards turn-on fluorescence.

Graphical abstract: Linkage induced enhancement of fluorescence in metal–carbene bond directed metallacycles and metallacages

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Publication details

The article was received on 10 Jun 2019, accepted on 21 Jun 2019 and first published on 21 Jun 2019


Article type: Communication
DOI: 10.1039/C9CC04444B
Chem. Commun., 2019,55, 8309-8312

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    Linkage induced enhancement of fluorescence in metal–carbene bond directed metallacycles and metallacages

    P. C. Purba, S. Bhattacharyya, M. Maity, S. Mukhopadhyay, P. Howlader and P. S. Mukherjee, Chem. Commun., 2019, 55, 8309
    DOI: 10.1039/C9CC04444B

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