Table 4.

Stability study of hydrazones.

Compound	Medium	Conc. (mol/L)	pH	Time	Stability
1a	28% EtOH/H2O	6.0 × 10−5	6.1	22 h	stable
1b		6.3 × 10−5	6.5	22 h	stable
1c		6.9 × 10−5	6.3	15 h	stable
1d		5.9 × 10−5	6.2	21 h	stable
5	5% EtOH/PIPES buffer (50 mM)	4.1 × 10−5	6.8	20 h	3% Abs. reduction
7		3.1 × 10−5	6.8	20 h	stable
				7 days	5% Abs. reduction