Clathrate of (2R, 5R, 8 R, 11R)-1, 4, 7, 10-Tetrakis(p-bromobenzyI)2, 5, 8, 11-tetraethyl-1, 4, 7, 10-tetraazacyclododecane and Toluenet

Abstract

The Institute of Physical and Chemical Research; Wako-shi, Hirosawa 351 Japan (2R, 5R, 8R, 11R)-1, 4, 7, 10-Tetrabenzy1-2, 5, 8, 11-tetraethyl-1, 4, 7, 10-tetraazacyclododecane [2] has been found to form various inclusion compounds with guest molecules as listed in Table 1. The title compound [1] p-bromo derivertive of [2], is also found to form a toluene clathrate crystal with 1: 1 molecular ratio. The crystal is orthorhombic, space group P 212121, with a=12.860(5), b=13.699(2), c =28.496(6) A, Z=4. An X-ray study has shown that the new host has a very similar crown type conformation of [2] as shown in Figs.1 and 2, but the inclusion form is quite different from that found in [2]. The host molecules are arranged in a layer parallel to ab plane (Figs.7 and 8). The neighboring layers are related by a two fold screw axis parallel to a axis. Therefore, the molecules in the neighboring layers have opposite directions with their ethyl groups facing each other. A zigzag channel is formed between these layers, and the guest molecules occupy this channel in head-to-tail arrangement along the a direction (Fig.3).