Abstract
The synthesis of some asymmetric and symmetric cationic dimethine cyanine dyes incorporating 1,6-dihydropyrazolo[3,4-c]pyrazole and/or 6H-pyrazolo-[4,3-d]-isoxazole moieties is described. The dimethine cyanines were characterised by elemental analysis, IR and H 1 NMR spectra and their electronic spectra.
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