Kolodziejski W, Corma A, Navarro M T, Pérez-Pariente J
Universidad Politécnica de Valencia, UPV-CSIC, Instituto de Technología Química, Camino de Vera, Valencia, Spain.
Solid State Nucl Magn Reson. 1993 Oct;2(5):253-9. doi: 10.1016/0926-2040(93)90005-8.
A novel mesoporous aluminosilicate MCM-41, synthesized in a liquid-crystal system, was characterized by magic angle spinning NMR. Conventional Bloch decay and cross-polarization spectra were compared. The 27Al spectra showed that the calcined material was highly siliceous, while 29Si NMR proved that it was rich in single and geminal silanol groups. Two kinds of the silanol groups were detected: exchanging and non-exchanging protons with water on the timescale of the 1H experiment. The 13C spectra of the uncalcined material were consistent with the concept of the micellar arrangement of the cetyltrimethylammonium template inside MCM-41.
一种在液晶体系中合成的新型介孔硅铝酸盐MCM-41，通过魔角旋转核磁共振进行了表征。比较了传统的布洛赫衰减谱和交叉极化谱。27Al谱表明煅烧后的材料是高硅质的，而29Si核磁共振证明它富含单硅醇基和孪硅醇基。检测到两种硅醇基：在1H实验时间尺度上与水交换和不交换质子的硅醇基。未煅烧材料的13C谱与十六烷基三甲基铵模板在MCM-41内部的胶束排列概念一致。
