A novel fluorescent waterborne polyurethane-based Sm (III) ternary complex improves plant growth in light environments and promotes plant growth

Polymeric rare earth complexes have attracted much attention due to their unique luminescence properties and application prospects. However, as an important component of polymeric rare earth complexes, Sm (III) complexes are rarely reported due to the lack of organic ligands matching the energy of Sm (III). Herein, A novel Sm(III) complexes (Sm(MPon) 3 APhen) emitting red fluorescence is synthesized by using Sm(III) as the central ion and 1-(4- tert -butylphenyl)-3-(4-methoxyphenyl)-1,3-propanone (MPon) and 5-amino-1,10-phenanroline (APhen) as ligands, respectively. Then, A novel waterborne polyurethane-based complex [Sm(MP) 3 AP] x -WPU with orange-red fluorescence is prepared by modified acetone method using Sm(MPon) 3 APhen as the end-blocking agent. Compared with Sm(MPon) 3 APhen, the fluorescence emission peak of [Sm(MP) 3 AP] x -WPU is blue-shifted, and the fluorescence intensity is significantly enhanced with the increase of the amount of Sm(MPon) 3 APhen. Notably, the strongest fluorescence emission peak of [Sm(MP) 3 AP] x -WPU is located in the red light band with the highest photosynthetic absorption efficiency of plants, which could significantly improve the light environment for plant growth and promote plant growth. More importantly, [Sm(MP) 3 AP] x -WPU is water as a dispersed phase, which is particularly safe and environmentally friendly during storage, transportation and use.