Synthetic Routes to Fluorescent Dyes Exhibiting Large Stokes Shifts

Derivatives of isomeric 2-(hydroxytolyl)-4,6-dimethylamino-1,3,5-triazines have been synthesized in high yields in a controlled manner using a multistep reaction sequence. Iodination of either 2-(1′-hydroxy-6′-methylphen-2′-yl)- or 2-(1′-hydroxy-4′-methylphen-2′-yl)-4,6-dimethylamino-1,3,5-triazine...

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Bibliographic Details
Published in:Journal of organic chemistry 2012-10, Vol.77 (20), p.8851-8863
Main Authors: Rihn, Sandra, Retailleau, Pascal, De Nicola, Antoinette, Ulrich, Gilles, Ziessel, Raymond
Format: Article
Language:English
Subjects:
Applied sciences
Chemical industry and chemicals
Chemical Sciences
Chemistry
Condensed benzenic and aromatic compounds
Dyes, pigments
Exact sciences and technology
Fluorescent Dyes - chemical synthesis
Fluorescent Dyes - chemistry
Heterocyclic compounds
Heterocyclic compounds with o, s, se, te hetero atom and condensed derivatives
Heterocyclic compounds with several n hetero atoms in the same ring, in separated rings or in fused rings
Industrial chemicals
Models, Molecular
Molecular Structure
Organic chemistry
Preparations and properties
Triazines - chemical synthesis
Triazines - chemistry
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Summary:Derivatives of isomeric 2-(hydroxytolyl)-4,6-dimethylamino-1,3,5-triazines have been synthesized in high yields in a controlled manner using a multistep reaction sequence. Iodination of either 2-(1′-hydroxy-6′-methylphen-2′-yl)- or 2-(1′-hydroxy-4′-methylphen-2′-yl)-4,6-dimethylamino-1,3,5-triazine with ICl provides species differing in the positioning of the iodo group relative to the hydroxyl which readily undergo Suzuki, Sonogashira, and Heck reactions under Pd(0) catalysis. Thus, thienyl, bisthienyl, and 3,4-ethylenedioxythienyl groups have been directly grafted, while unsubstituted polycyclic aromatics such as pyrene and perylene have been linked via alkyne bridges, as have ethynyldifluoroborondipyrromethane (BODIPY) dyes prepared in situ. The presence of a hydrogen bond in the ground state involving the hydroxyl substituent has been established by proton NMR and several X-ray structure determinations. All of the new dyes with a simple substituent (phenyl, thienyl) exhibited a pronounced green fluorescence resulting from an intramolecular proton transfer in the excited state (ESIPT) which produces a large Stokes shift (>10 000 cm–1). With other dyes, the fluorescence of the keto form responsible for the ESIPT process could be used as the input energy in efficient intramolecular energy transfer processes. Replacing perylene with pyrene allowed reversal of the direction of energy transfer from the polyaromatic module to the keto form.
ISSN:0022-3263
1520-6904
DOI:10.1021/jo301059u