Synthesis and optical properties of copper(II) and nickel(II) complexes of a highly fluorescent morpholine-derivative

摘要

A morpholine substituted methyl 3-hydroxy-2-naphthoate was synthesized. The morpholine derivative displayed an intense fluorescence. Owing to the presence of suitable donor atoms, it was employed for the detection of transition metal ions. The crystals of copper and nickel complexes of the fluorescence active ligand were grown via vapor diffusion method. The ligand structure and its metal complexes were characterized using H-1 NMR, IR, HR-MS and single crystal X-ray crystallography. The synthesized ligand displayed selective turn-off fluorescence response in the presence of Cu2+ and Ni2+ ions. Fluorescence active letters were encoded successfully on filter paper utilizing metal complexes as a tool towards digital writing. (C) 2019 Elsevier Ltd. All rights reserved.