Three new ferrocene–peptide compounds were designed and prepared. We investigated their gelling abilities and found that two of them were capable of gelling various organic solvents, especially alcohols. Gels also formed in mixed alcohol–water solvents, which decreased the critical gelation concentration (CGC) of the gels. Compound 1, comprised of a dipeptide (Phe-Phe) and ferrocene, acted as a novel low-molecular-weight gelator in the formation of metallogel 1 in isopropanol–water (v/v = 1 : 1). This gelation was found to be reversible under redox stimuli; changing of the redox state of ferrocene induced a reversible gel–sol phase transition. Additionally, gel 1 responded to β-CD as a result of host–guest interactions between this compound and ferrocene. With the addition of β-CD, the gel network gradually broke down, as demonstrated by SEM.
我们设计并制备了三种新的
二茂铁-肽化合物。我们研究了它们的胶凝能力,发现其中两种能够使多种有机溶剂(尤其是
醇类)胶凝。在醇-
水混合溶剂中也会形成凝胶,从而降低了凝胶的临界胶凝浓度(CGC)。化合物1由二肽(Phe-Phe)和
二茂铁组成,在
异丙醇-
水(体积比为1:1)中形成
金属凝胶1时,可作为新型低分子量胶凝剂。研究发现,这种胶凝在氧化还原刺激下是可逆的;
二茂铁氧化还原状态的变化会引起可逆的凝胶-溶液相变。此外,由于化合物1和
二茂铁之间存在主客体相互作用,凝胶1对β-CD有反应。
SEM显示,随着β-CD的加入,凝胶网络逐渐分解。