Europium Coordination Compounds for the Design of a Polyethylene-Based Luminescent Composite Material

The reaction of europium dibenzoylmethanate complex Na⁺[Eu(Dbm)₄]^– with 1-alkyl-4-dimethylaminopyridinium salts gives compounds [RNC₅H₄NMe₂]⁺[Eu(Dbm)₄]^– (Dbm = [PhC(O)CHC(O)–Ph]), where R = C₁₀H₂₁ (I) or a set of oligomers C_nH_2n+1, (n is even) ([(R-NC₅H₄NMe₂)]I) with a weight-average molecular weight M_w = 1520 (II). The molecular structure of complex I was established by X-ray diffraction analysis (CCDC no. 2405293). Compounds I and II were used as the luminescent components for a luminescent composite material based on low-density polyethylene (LDPE). The optical properties of complexes I and II and LDPE-based composite materials prepared using I and II were investigated.