Organosilicas based on purine–pyrimidinebase pair assemblies: a solid state NMR point of view
作者:Guilhem Arrachart、Carole Carcel、Joël J. E. Moreau、Geoffrey Hartmeyer、Bruno Alonso、Dominique Massiot、Gaëlle Creff、Jean-Louis Bantignies、Philippe Dieudonne、Michel Wong Chi Man、Gerhard Althoff、Florence Babonneau、Christian Bonhomme
DOI:10.1039/b714785f
日期:——
Organosilicas based on adenine (A) and thymine (T) assemblies have been synthesized. A surfactant-free route, based on specific molecular recognition between A and T entities, has been developed. The characterization of the H-bond networks, in both homo- and hetero-assemblies, has been emphasized by using 1H solid state NMR (nuclear magnetic resonance). The latest experimental developments were implemented (i.e. very fast MAS (magic angle spinning) experiments at 750 MHz and 33 kHz), in order to enhance drastically the spectral resolution. Moreover, 1H experiments at 67 kHz in 1.3 mm rotors were performed. Spatial connectivities between protons were established by using 1Hâ1H DQ (double quantum) MAS experiments, allowing the precise characterization of A/A, T/T and A/T associations.
基于腺嘌呤(A)和胸腺嘧啶(T)组装的有机硅材料已经合成。开发了一种无表面活性剂的路线,基于A和T之间的特定分子识别。通过使用1H固态核磁共振(NMR)强调了同聚和异聚组装中的氢键网络特征。应用了最新的实验技术(即在750 MHz和33 kHz下进行的非常快速的魔角旋转(MAS)实验),以显著提高谱图分辨率。此外,还在1.3 mm转子上进行了67 kHz的1H实验。通过使用1H–1H双量子MAS实验建立了质子之间的空间连接,从而精确表征了A/A、T/T和A/T的结合。