[EN] INTERMEDIATE COMPOUNDS FOR THE PREPARATION OF MESO-SUBSTITUTED CYANINE, MEROCYANINE AND OXONOLE DYES [FR] COMPOSÉS INTERMÉDIAIRES POUR LA PRÉPARATION DE COLORANTS DE TYPE CYANINES, MÉROCYANINES ET OXONOLES MÉSO-SUBSTITUÉES
[EN] INTERMEDIATE COMPOUNDS FOR THE PREPARATION OF MESO-SUBSTITUTED CYANINE, MEROCYANINE AND OXONOLE DYES [FR] COMPOSÉS INTERMÉDIAIRES POUR LA PRÉPARATION DE COLORANTS DE TYPE CYANINES, MÉROCYANINES ET OXONOLES MÉSO-SUBSTITUÉES
The synthesis and properties of novel cyanine and ketocyanine dyes incorporating 9,9-di-n-propylfluorenyl units is reported. While bathochromic shifts of order 100 nm are observed in cyanines for addition of each vinylene unit (lengthening the methine chain) it was observed that addition of the fluorenyl unit enabled fine tuning of the UV-visible absorption spectrum. The hypsochromic shift in the UV-visible absorption spectrum of the ketocyanines relative to the corresponding cyanine dyes was found to be consistent with the Dewar-Knott colour rule. The oxidation ('Highest Occupied Molecular Orbital energy') and reduction ('Lowest Unoccupied Molecular Orbital energy') potentials were also qualitatively consistent with the Dewar-Knott colour rule, with the 'HOMO energies' of the comparative dyes being the same and the LUMO energies of the ketocyanines being destabilized relative to the cyanine dyes. (C) 2013 Elsevier Ltd. All rights reserved.
[EN] INTERMEDIATE COMPOUNDS FOR THE PREPARATION OF MESO-SUBSTITUTED CYANINE, MEROCYANINE AND OXONOLE DYES<br/>[FR] COMPOSÉS INTERMÉDIAIRES POUR LA PRÉPARATION DE COLORANTS DE TYPE CYANINES, MÉROCYANINES ET OXONOLES MÉSO-SUBSTITUÉES
申请人:AGFA GRAPHICS NV
公开号:WO2009080689A1
公开(公告)日:2009-07-02
The present invention provides new intermediate compounds enabling the preparation of N-meso substituted cyanine, merocyanine or oxonole dyes wherein the N-meso substituent comprises electron withdrawing groups and wherein such N-meso substituents are introduced at the intermediate level. These intermediates enable the formation of dyes having in the meso-position N-substituents comprising electron withdrawing groups without the need for further derivatization of the meso-substituent at the dye level.