K. Moriya et al., Mesomorphic phase transition of a cyclotetraphosphazene containing Schiff base moieties: comparison with the corresponding cyclotriphosphazene, CHEM COMMUN, (13), 2000, pp. 1111-1112
Newly prepared octakis{4-[N-(4'-heptyloxyphenyl)iminomethyl]phenoxy}cyclote
traphosphazene, consisting of a cyclotetraphosphazene ring backbone and Sch
iff base side-chain groups has been found to generate an enantiotropic smec
tic A phase; this is a first example of a mesomorphic cyclotetraphosphazene
.