Dication Containing Three Aromatic Ring Structure-Directs toward a Chiral Zeolite, Spans Three Cavities, and Effectively Traps Water

The chiral zeolite STW has been synthesized using a large dication containing three aromatic rings (two imidazolium moieties plus benzene one). integrity of the occluded organics is proven by 1H and 13C liquid NMR dissolved in HF/D2O. Molecular simulations strongly suggest that each ring located different cavity so crosses two medium pore 10-membered-ring (MR) windows. This confirmed Rietveld refinement against synchrotron powder X-ray diffraction data, which suggests there also trapped water cavities, explaining significant excess H found this material. presence very soundly Fourier-transform infrared experiments, show cannot leave even after heating at 180 °C under vacuum. allow us to conclude due blockage 10 8MR windows organics. peculiar situation an organic structure-directing agent spanning cavities important implications for structure-direction concept are briefly discussed. Several derivatives have studied, their possibility enantioselectively direct crystallization analyzed.