Crystal solvates of zinc(II) 3,3',5,5'-tetramethyl-4,4'-dibromo-dipyrromethenate [ZnL2] form supramolecular complexes [ZnL2(C2H5OH)(2)] and [ZnL2(DMF)(2)] with molecules of ethanol and DMF. Such complexes are stable up to similar to 150 and 111 degrees C, respectively. According to the quantum chemical calculations, [ZnL2(DMF)(2)] is formed due to the additional coordination of molecular ligands by the zinc atom (Zn delta(+) <- : O). In the case of [ZnL2(C2H5OH)(2)], along with weak coordination interactions of the hydroxyl group oxygen with the zinc ion, the main contribution to the suprastructure formation is made by hydrogen bonds (C2H5OH <- :N <=), which makes both the destruction onset temperature and the total enthalpy (Delta H-Sigma) of the intermolecular interactions in [ZnL2(C2H5OH)(2)] much higher than in [ZnL2(DMF)(2)]. The obtained results are interesting for the development of new [ZnL2] fluorescent sensors of N- and O-containing analytes.
