From the data presented inTable 1it can be stated that Ipof
hydrazone dyes D2 and D3 possessing methyl or methoxy substituents at thep-phenyl positions of triphenylamine are close to
that of dye D1 and differ only in the measurement error range. The
replacement of the aromatic phenyl ring in hydrazine fragment by
an aliphatic nonyl chain in dyes D4 and D5 leads to theIpvalue
decrease to 5.15 eV in D4 and 5.25 eV in D5.