Structures and Photoluminescence Properties of Zinc(II)/Cadmium(II)-Based Organic-Inorganic Hybrid Metal Halides Derived from (E)-N,N-Dimethyl-4-(2-(pyridin-4-yl)vinyl) aniline

With (E)-N,N-dimethyl-4-(2-(pyridin-4-yl)vinyl)aniline (EDPVA) as the organic source, and metal halides ZnX2 and CdX2 as the inorganic source, using the corresponding concentrated HX (X= Cl, Br) to provide acidic medium, four ionic mononuclear organic-inorganic hybrid metal halides, (H(2)EDPVA)[ZnCl4] (1), (H(2)EDPVA)[ZnBr4] (2), (H(2)EDPVA)[CdCl4] (3) and (H(2)EDPVA)[CdBr4] (4), were obtained by slow evaporation of solvent. Single crystal structure analysis shows that there were electrostatic interactions and hydrogen bonds between the alternative rigid organic cations (H(2)EDPVA)(2+) and slightly distorted tetrahedral inorganic anions [MX4](2-) (M=Zn, Cd; X=Cl, Br). The photoluminescence properties of compounds 1 similar to 4 showed that the blue phosphorescence peaks were at 459, 446, 440 and 434 nm, respectively; the Stokes shifts were 79, 72, 61 and 55 nm, respectively; the full widths at halfmaximum were 100, 88, 87 and 100 nm, respectively; the luminescence lifetimes (tau) were 0.47, 8.38, 18.38 and 11.62 mu s, respectively. According to the photoluminescence mechanism analysis, the phosphorescent emission of compounds 1 similar to 4 is the result of synergistic action of organic cations (H(2)EDPVA)(2+) and inorganic anions [ZnX4](2-) or [CdX4](2-) (X=Cl, Br), respectively. CCDC: 2094237, 1; 2094238, 2; 2094239, 3; 2094240, 4.

Automated summary

Four ionic mononuclear organic-inorganic hybrid metal halides were synthesized using (E)-N,N-dimethyl-4-(2-(pyridin-4-yl)vinyl)aniline as the organic source, metal halides ZnX2 and CdX2 as the inorganic source, and concentrated HX (X= Cl, Br) to provide an acidic medium. The compounds exhibited blue phosphorescence with different emission peaks, Stokes shifts, full widths at half maximum, and luminescence lifetimes, attributed to the synergistic action of organic cations and inorganic anions in the crystal structures.