Article ID Journal Published Year Pages File Type
595432 Colloids and Surfaces A: Physicochemical and Engineering Aspects 2010 8 Pages PDF
Abstract

Ferrocene (Fc) as a pendant structure has been intentionally introduced into three dicholesteryl derivatives of a LS2 type structure, where L denotes a linker and S stands for a steroidal unit. The compounds as designed are denoted as 1, 2 and 3 according to the number of hydrogen-bonding sites in the linkers. Gelation tests revealed that 1 gelates none of the 34 solvents tested, 2 gelates some of the alkanes, and 3 gelates only cyclohexane and DMSO. Importantly, the gel system of 2/n-decane exhibits a sol–gel phase transition upon thermal, ultrasonic, mechanical or even chemical treatments. FTIR, temperature- and concentration-dependent 1H NMR spectroscopy measurements revealed that intermolecular hydrogen-bonding is one of the driving forces for gel formation. XRD analysis demonstrated that 2 exists in a stretched conformation and aggregates into layered structure in its n-decane and cyclohexane gels. Far from that expected, introduction of Fc unit does not bring the redox responsive properties to the gel systems.

Related Topics
Physical Sciences and Engineering Chemical Engineering Colloid and Surface Chemistry
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