The analogous hydrazone dyes bearing a nonyl chain at the hydrazine fragment and methyl or hexyl groups at the triphenylamine
fragment, were prepared via alkylation of the intermediate 2dor
2e, which were obtained by interaction of the corresponding triphenylamine dialdehyde1bor1dwithN-phenylhydrazine sulphate. Finally, the isolated hydrazone aldehyde3aor3breacted
with rhodanine-3-acetic acid to give the dye D4 and D5. We had a
strong presumption, that the alkyl chains in the dyes D4, D5 would
induce good solubility in common organic solvents and reduce
tendency of dye aggregate formation. The structures of all dye
molecules were characterized unambiguously by FT-IR,1
H and
13
C
NMR spectroscopy. Elemental analysis data was consistent with the
desirable structures.
3.2. Optical, electroch