Abstract
Truxene-5,10,15-trispiro-9,-fluorene 2 and its hexaethylderivatives 3, truxene-5,10,15-trispiro-4,-4,H-cyclopenta[2.1-b:3.4-b,]dithiophene derivatives 4 and 5 have been newly synthesized and examined their structures and physicochemical properties. In the electronic spectra, the longest wavelength bands of these compounds showed bathochromic shifts compared with that of truxene 1 in the range from 25nm to50nm. It has been suggest the orbital interactions between two kind of flat π systems that orthogonally connected each other through spiro-juncture. But the first ionization potentials of 1 and 2 obtained photoelectron spectra showed similar value, in which means that there exist little perturbation effects between two π systems. Upon crystallization from benzene-hexanes, compounds 3 and 4 afforded clathrate crystals including benzene as a guest component with a host:guest ratio of 1:3 respectively. X-ray crystallographic analysis revealed the similar crystal structural feature of both clathrates. In the both crystals, three benzene molecules included one by one in Northern Hemisphere that divided into three space by fluorene or dithienocyclopentadienyl parts (i. e. panels). On the Southern Hemisphere, remaining three panels geared into three panels of another neighboring host molecule. Electronic oxidation reaction of these compounds and synthesis of pyridine derivatives 6 are now in progress.
