Regulation of substituent groups on morphologies and self-assembly of organogels based on some azobenzene imide derivatives

Table 1 Gelation properties of four compounds at room temperature

Solvents	TC16-Azo	TC16-Azo-Me	SC16-Azo	SC16-Azo-Me
Chloroform	S	S	S	I
Tetrachloromethane	S	S	I	G (4.0)
Benzene	S	S	G (2.0)	G (2.0)
Toluene	S	S	I	I
Nitrobenzene	G (1.5)	G (2.0)	I	G (2.0)
Aniline	G (1.5)	G (2.0)	I	G (2.0)
Acetone	G (1.5)	G (3.0)	I	I
Cyclopentanone	G (1.5)	S	I	I
Cyclohexanone	S	S	I	I
Ethyl acetate	G (2.5)	G (2.0)	I	I
n-Butyl acrylate	S	S	I	I
Petroleum ether	I	I	I	I
Pyridine	G (1.5)	S	G (2.0)	I
DMF	G (1.5)	G (2.0)	G (2.0)	G (3.0)
Ethanol	G (1.5)	I	I	I
n-Propanol	G (2.5)	G (2.0)	I	I
n-Butanol	G (2.5)	G (2.0)	I	I
n-Pentanol	G (2.5)	G (2.0)	I	I
1,4-Dioxane	G (2.5)	S	I	G (3.0)
THF	S	S	I	I
n-Hexane	I	I	I	I

DMF, dimethylformamide; THF, tetrahydrofuran; S, solution; G, gel; I, insoluble; for gels, the critical gelation concentrations at room temperature are shown in parentheses (% w/v).