Application of three Ln(Ⅲ)-coordination polymers in fields of luminescence, antibacteria and detection of Fe3+ and 4-nitrophenol

Three lanthanide-based coordination polymers (Ln-CPs) with layered structure, {[La2(L)3(DMF) (H2O)3]·H2O}n (1), {[Eu2(L)3(DMF)2(H2O)]·(H2O)}n (2) {[Tb2(L)3(DMF)2(H2O)]·H2O}n (3) were successfully synthesized from H2L(N,N′-bis(4-carbozylbenzyl)aniline). Remarkably, compound 3 has extremely high sensitivity to 4-nitrophenol. When the concentration of 4-nitrophenol reaches 5.98 × 10−3 mmol/L, the fluorescence intensity of compound 3 is quenched by 59%. The calculated KSV is 7.56 × 104 and limit of detection (LOD) is 4.73 μg/L. 3 exhibits a highly sensitive detection towards Fe3+ and compound 2 shows outstanding antibacterial effects on Staphylococcus aureus, respectively. The white light emission was also investigated by changing the mixing ratio of LaNO3, EuNO3 and TbNO3 during the preparation of coordination polymers.