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- W2592244066 abstract "Abstract It was found that methylsubstituted zinc(II) bis(dipyrromethenate)s ([Zn 2 L 2 ]) form stable supramolecular π-π-complexes [Zn 2 L 2 X n ] (n=1, or 2) with aromatic hydrocarbons (Х) (X - benzene (B), toluene (T), m -xylene ( m X), p -xylene ( p X), and o -xylene ( o X)). The [Zn 2 L 2 X n ] solid samples were obtained by the slow crystallization from the [Zn 2 L 2 ] saturated solutions in X at the temperature about 300 K. Composition, stability, and spectral-luminescent properties of the [Zn 2 L 2 X n ] 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 ( φ ) of [Zn 2 L 2 Х n ] are lower (to ~1.2–3.9 times) than quantum yields ( φ о ) of [Zn 2 L 2 ] in cyclohexane. It was shown that fluorescence quenching efficiencies of helicates increase with decreasing the molecular ligands aromaticity. The thermal dissociation processes of [Zn 2 L 2 X n ] have been investigated in argon atmosphere. Crystal solvates are stable up to the temperature ~369–477 K. The [Zn 2 L 2 X n ] 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 π-π-intermolecular interactions in [Zn 2 L 2 X n ] are the main cause of the fluorescence quenching of [Zn 2 L 2 ] in the aromatic hydrocarbons presence." @default.
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- W2592244066 date "2017-07-01" @default.
- W2592244066 modified "2023-09-24" @default.
- W2592244066 title "The influence of structural factors on the composition, spectral-luminescent properties and thermal stability of zinc(II) bis(dipyrromethenate)s crystal solvates with aromatic hydrocarbons" @default.
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- W2592244066 doi "https://doi.org/10.1016/j.jlumin.2017.02.062" @default.
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