The ability of A*[s]U dinucleosides to gel organic solvents and water is modulated by changing the nature of the substituents at OC(2′) and OC(3′), as evidenced by comparing the gelation of the dinucleosides 7–9 and the properties of the gels. A mere extension of the hydrophobic moiety, by replacing the isopropylidene groups of 2 by cyclohexylidene groups, as in 7, has a small effect, while changing
A *的能力[ š ] V二核苷到凝胶的有机溶剂和
水是通过在改变所述取代基的性质调制ø C(2')和Ô C(3'),就证明了进行比较的凝胶化双核苷7 – 9和凝胶的性质。疏
水部分的单纯延长,通过更换的异亚丙基制备2由亚环己基基团,如在7,具有小的影响,而改变
核糖环的构象和减少疏
水部分的大小,如在8,对胶凝范围,最低胶凝浓度(
戊醇和
癸醇的最低胶凝浓度低至0.07%)和凝胶的性能有很强的影响。完全脱保护的二核苷9以最小胶凝浓度为0.6%胶凝
水。相应的干凝胶的
TEM显示出直径为约1μm的纤维的形成。30至90 nm。