Synthesis, Structure and Photoluminescence Analysis of a Ho3+- cluster-based 3D coordination polymer: {Ho2(H2O)2(DMF)2(ATPA)3}n

Abstract

A new Ho(III) cluster-based 3D coordination polymer with the formula {Ho2(H2O)2(DMF)2(ATPA)3}n (H2ATPA = 2-Aminoterephthalic acid, DMF = N,N-dimethylformamide), 1, has been successfully synthesized via the hydrothermal method and characterized by elemental analysis, FT-IR, UV, single crystal and powder X-ray diffraction and photoluminescence measurements. Each Holmium atom has a distorted bicapped trigonal prismatic geometry with coordination of eight oxygen atoms. The shifting of the absorption band in the UV–Visible spectrum of 1 indicates the Ho atoms involved in coordination with H2ATPA ligand. Ho(III)-based characteristic narrow strong emission bands due to the f–f transitions of Ho(III) cation have been detected for 1 in the visible region. The emission bands observed at 442 nm and 464 nm are the most severe, so the investigated complex emits the bright-blue light. One can conclude that the energy transfers from the H2ATPA ligand to Ho(III) have been done effectively so that 1 would have the potential applications in the optical amplification field.