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Phenanthro[b]phenazine, a new heterocyclic ring structure of both biological and physical interests, has been prepared by coupling 1, 2-phenylenediamine with triphenylene-2, 3-quinone derivative. The first derivative of this novel core, 2,3,6,7-tetrapentyloxyphenanthro[b]phenazine, shows a monotropic columnar phase.
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