It was found that methylsubstituted zinc(II) bis(dipyrromethenate)s ([Zn-2-L-2]) form stable supramolecular pi-pi-complexes [Zn2L2Xn] (n=1, or 2) with aromatic hydrocarbons (X) (X -benzene (B), toluene (T), m-xylene (mX), p-xylene (pX), and o-xylene (oX)). The [Zn2L2Xn] solid samples were obtained by the slow crystallization from the [Zn2L2] saturated solutions in X at the temperature about 300 K. Composition, stability, and spectral-luminescent properties of the [Zn2L2Xn] crystal solvates were studied by means of FT-IR, PXRD, thermal, mass spectral, quantum chemical, absorption, and fluorescence analyses. Spectroscopic studies showed that the quantum yields (phi) of [Zn2L2X] are lower (to similar to 1.2-3.9 times) than quantum yields (phi(0)) of [Zn2L2] in cyclohexane. It was shown that fluorescence quenching efficiencies of helicates increase with decreasing the molecular ligands aromaticity. The thermal dissociation processes of [Zn2L2Xn] have been investigated in argon atmosphere. Crystal solvates are stable up to the temperature similar to 369-477 K. The [Zn2L2Xn] solvates stabilities increase with decreasing the number of alkyl substituents in pyrrole rings of complex domains. It was demonstrated that high values of energy of pi-pi-intermolecular interactions in [Zn2L2Xn] are the main cause of the fluorescence quenching of [Zn2L2] in the aromatic hydrocarbons presence.
