Luminogens for Aggregation‐Induced Emission via Titanium‐Mediated Double Nucleophilic Addition to 2,5‐Dialkynylpyridines: Formation and Transformation of the Emitting Aggregates

New luminogens for aggregation‐induced emission (AIE), which are characterized by a branched cross‐conjugated 2,6‐bis(1,2,2‐triarylvinyl)pyridine motif, have been synthesized exploiting the one‐pot Ti‐mediated tetraarylation of 2,6‐bis(arylethynyl)pyridines. Thin layer solid‐state emitters were prep...

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Bibliographic Details
Published in:Chemistry : a European journal 2020-04, Vol.26 (19), p.4269-4280
Main Authors: Foschi, Francesco, Synnatschke, Kevin, Grieger, Sebastian, Zhang, Wen‐Shan, Wadepohl, Hubert, Schröder, Rasmus R., Backes, Claudia, Gade, Lutz H.
Format: Article
Language:English
Subjects:
Agglomeration
Aggregates
aggregation-induced emission
Biological evolution
Chemistry
Colloiding
Colloids
Dispersions
Emissions
Emitters
extinction spectroscopy
Light scattering
one-pot tetraarylation
Optical density
Photon correlation spectroscopy
Pyridines
Scattering
scattering exponent
Spectroscopy
Titanium
titanium tetraisopropoxide
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Summary:New luminogens for aggregation‐induced emission (AIE), which are characterized by a branched cross‐conjugated 2,6‐bis(1,2,2‐triarylvinyl)pyridine motif, have been synthesized exploiting the one‐pot Ti‐mediated tetraarylation of 2,6‐bis(arylethynyl)pyridines. Thin layer solid‐state emitters were prepared by spin‐coating of the luminogens, while AIE‐colloidal dispersions were investigated in terms of optical density and scattering behaviour. This has given insight into particle size distributions, time evolution of the aggregation and the influence of different functionalization patterns on the luminescence of molecular aggregates. In particular, a combination of extinction spectroscopy and dynamic light scattering is being proposed as a powerful method for investigating the dynamic aggregation process in AIE‐type colloids. Aggregate and shine! New luminogens for aggregation‐induced emission (AIE) have been synthesized exploiting the one‐pot Ti‐mediated tetraarylation of 2,6‐bis(arylethynyl)pyridines. Their aggregation‐related photophysics and viscochromicity have been studied in detail.
ISSN:0947-6539
1521-3765
1521-3765
DOI:10.1002/chem.201905611