2-Octadecylquinone-5-sulfonic acid (1) formed orthogonal molecular monolayers on the Langmuir trough, which were reduced to long-lived anions with dithionite added to the subphase. After the smooth films were transferred to different substrates, quantitative rearrangement to long fibers of flat-lying molecules was observed. The fibers formed typical disclinations known from liquid-crystalline compounds. Addition of a beta-tetraethyl-beta-tetrapyridinyl-porphyrin (2) mixed monolayer, containing flat-lying as well as upright-standing porphyrin domains, led to selective fluorescence quenching. Only the flat-lying porphyrins (lambda(max) = 645 nm) were reached by the quinone fibers; the upright-standing porphyrins (lambda(max) = 660 nm) continued to fluoresce.