SYNTHESIS AND CRYSTAL-STRUCTURE OF THE NEW BOROSILICATE ZEOLITE RUB-13

RUB-13 is a borosilicate zeolite which represents a new porous structu re type. The material was synthesized in the system SiO2-B2O3-ethylene diamine- 1,2,2,6,6-pentamethylpiperidine-water at 160 degrees C. Singl e crystal structure analysis (R=6.0%) revealed that RUB-13 has a two-d imensional pore system with intersecting 8-membered ring channels. The void at the intersection is a large [4(6)5(8)6(4)8(4)] cage with a fr ee volume of ca. 550 Angstrom(3). C-13 Cross-polarization magic-angle spinning nuclear magnetic resonance (CP-MAS NMR) spectroscopy proves t hat protonated pentamethylpiperidine (PMP) molecules occupy the cages and compensate the negative charge of the borosilicate framework. The unit cell composition is [S30.4B1.6O64]. 1.6 PMP. All crystals are con tact twins with a twin plane (001) and show signs of one-dimensional d isorder.