compounds [py‐N‐(CH2)nOC6H3‐3,5‐(OMe)2]+(X−) (1bCl: n=10, X=Cl; 1cBr: n=12, X=Br) and α‐cyclodextrin (α‐CD) form supramolecular hydrogels in aqueous media. The concentrations of the two components influences the sol–gel transition temperature, which ranges from 7 to 67 °C. Washing the hydrogel with acetone or evaporation of water left the xerogel, and 13C CP/MAS NMR measurements, powder X‐ray diffraction
的混合物Ñ -烷基
吡啶鎓化合物[py- Ñ - (CH 2)Ñ OC 6 H ^ 3 -3,5-(OME)2 ] +(X - )(1B CL:Ñ = 10,X =
氯; 1C
溴:n = 12,X = Br)和α-
环糊精(α-CD)在
水性介质中形成超分子
水凝胶。这两种成分的浓度会影响溶胶-凝胶转变温度,其范围为7至67°C。用
丙酮洗涤
水凝胶或蒸发
水分留下干凝胶,然后13C CP / MAS NMR测量,粉末X射线衍射(XRD)和扫描电子显微镜(
SEM)显示,1b Cl(或1c Br)和α-CD的干凝胶由高结晶度的拟轮烷组成。凝胶的13 C 1 H}和1 H NMR光谱揭示了组分的详细组成。来自1b Cl和α‐CD的凝胶包含相应的[2] ‐和[3]假轮烷,[ 1b⋅(α‐CD)] Br和[ 1b⋅(α‐CD)2 ] Br,而来自1c Br的凝胶α-CD主要由[3]假轮烷[ 1c⋅(α-CD)2