The target of this work was the synthesis and characterization of bent-core materials which may form biaxial nematic phases, ideally with low transition temperatures. In addition polar orthogonal smectic phases were in the focus. Hence bent-core molecules derived from 4-cyanoresorcinol with different wings were synthesized. Due to a variation of the direction of the carboxyl linking groups between the outer benzene rings, their influence on the mesomorphic properties was studied. Short rigid biphenyl and longer tolane units were also used as wings. Further modifications were done by the introduction of lateral fluorine substituents and exchange of the central cyano group by fluorine and a methyl group. The mesophase behaviour of the synthesized bent-core materials was investigated by means of polarizing optical microscopy, differential scanning calorimetry, X-ray diffraction, electrooptical and dielectric experiments.