Synthesis, Structure, and Photoluminescent Properties of Zn2+, Mn2+, Cd2+, Eu3+, and Tb3+ Complexes with 4-Allyl-2,3,5,6-Tetrafluorobenzoic Acid Anions and 1,10-Phenanthroline.

We report a synthesis of a series of molecular compounds and coordination polymers of Zn²⁺, Mn²⁺ Cd²⁺, Eu³⁺, and Tb³⁺ with 4-allyl-2,3,5,6-tetrafluorobenzoic acid (4-Afb) anions and 1,10-phenanthroline with compositions [Zn(H₂O)(phen)(4-Afb)₂] (1), [Mn(H₂O)(phen)(4-Afb)₂]_n·nH₂O (2), [Cd(H₂O)(phen)(4-Afb)₂]_n (3), [Cd(phen)(4-Afb)₂]_n (4), [Ln₂(phen)₂(4-Afb)₆] (Ln = Eu 5Eu; Tb 5Tb). It is shown that the obtained cadmium coordination polymers have various compositions and structures, depending on crystallization conditions. The prepared compounds are characterized by single-crystal XRD, powder XRD, IR spectroscopy, and CHN analysis. Noncovalent interactions are analyzed using the Hirshfeld surface analysis. It is determined that the crystal packings is mainly stabilized by π⋯π, C–H⋯F, and C–F⋯π interactions. The photoluminescent properties of the 5Eu and 5Tb complexes are studied. It is shown that the structure-forming effects of non-covalent "arene–perfluoroarene" interactions can be possibly used for preorganizing reactive functional groups in the crystal. [ABSTRACT FROM AUTHOR]