Synthesis and characterization of 1,3-bis-(2-dialkylamino-5-thiazolyl)-substituted squaraines and their 2-(dialkylamino)thiazole precursors

✍ Scribed by Keil, D. ;Hartmann, H.

• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 539 KB
• Volume: 1995
• Category: Article
• ISSN: 0947-3440
• DOI: 10.1002/jlac.1995199506139

✦ Synopsis

Abstract

By condensation of squaric acid (1) with 2‐(dialkylamino)‐substituted thiazoles 8 a novel type of heterocyclic‐substitued squaraines of the general structure 9 was prepared in moderate yield mostly. The squaraines 9 obtained are sparingly soluble in the most organic solvents and exhibit, in these solvents, narrow absorption bands in the visible range at about 620–700 nm. In dispersed form, the absorption bands of the squaraines 9 are, however, broadened and shifted into the NIR region at about 900 nm. These unique properties of the new squaraines 9 suggest the use of these dyes as spectral sensitizers for laser‐driven data recording or data storage media.