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Isomeric pyrimidinophanes containing uracil moieties and nitrogen atoms in bridges have been synthesized and characterized by a variety of methods both in solid and in solution. Unambiguous assignment of mutual arrangement of C(4) pyr O groups at different pyrimidine rings in isomers is made by X-ray diffraction. In solutions the arrangement of C(4) pyr O groups of the isomeric pyrimidinophanes results in different dipole moments. Based on dipole moments simulations mutual orientation of uracil units in isomers is analysed. UV-data are discussed in terms of hypo-or hyperchromic effect.

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