Synthesis and luminescent properties of novel red-emitting Eu(III) complexes based on alanine aliphatic derivatives with different optical rotation

Abstract

A series of novel luminescent amino acid-rare earth complexes (denoted as Eu(L/D-SA) _3 -Phen) have been successfully synthesized. Using stearoyl alanine (denoted as SA) with different optical rotations as the first ligand and 1,10-phenanthroline (Phen) as the second ligand, the products were prepared by solution chemical reaction. Fourier transform infrared spectrometer (FT-IR), nuclear magnetic resonance spectroscopy ( ^1 H NMR), x-ray diffraction (XRD), scanning electron microscope (SEM), ultraviolet and visible spectrum (UV) and photoluminescence spectroscopy were used to characterize the properties of Eu(L/D-SA) _3 -Phen. FT-IR, ^1 H NMR and XRD indicate that ligand SA and Phen were prepared and successfully combined with Eu ^3+ ions. SEM analysis shows relatively uniform morphological structure. Eu(L/D-SA) _3 -Phen exhibit a typical luminescence emission peak at 614 nm. In addition, the lifetimes of Eu(L/D-SA) _3 -Phen are in scale of millisecond. The relationship between fluorescence intensity of Eu(L/D-SA) _3 -Phen and the optical rotation of ligand SA has been studied and discussed. Based on the results, Eu(L/D-SA) _3 -Phen have excellent luminescent performance and possess potential application as luminescent materials.

Keywords

• optical rotation
• amino acid
• rare earth complexes
• europium
• luminescent material