Abstract
A new host compound TTPP (tris(2,3-triphenylenedioxy)cyclotriphosphazene), which is able to form a porous network, has been synthesized in five steps. When it crystallizes as a single component, TTPP exhibits a crystal structure with a monoclinic unit cell, the space group P21/c (no. 14) and unit cell dimensions of a 1⁄4 14.909(2) A#, b 1⁄4 31.013(4) A#, c 1⁄4 9.074(1) A#, b 1⁄4 102.12(1) . Co-crystallization of TTPP with 1,2,4-trichlorobenzene forms an inclusion crystal having a triclinic unit cell with a P"1 space group (no. 2) and unit cell dimensions of a 1⁄4 8.769(2) A#, b 1⁄4 15.024(2) A#, c 1⁄4 21.216(2) A#, a 1⁄4 94.82 (0) , b 1⁄4 99.98(0) , g 1⁄4 98.23(1). The guest lies in two kinds of channel-like cavities with dimensions of 6.1 8.4 A#2 and 10.7 12.4 A#2 respectively. This represents the biggest porous network built up by spirocyclotriphosphazene derivatives to date.