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

Abstract

A new Ho(III) cluster-based 3D coordination polymer with the formula {Ho-2(H2O)(2)(DMF)(2)(ATPA)(3)}(n)(H(2)ATPA = 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 of1indicates the Ho atoms involved in coordination with H(2)ATPA ligand. Ho(III)-based characteristic narrow strong emission bands due to the f-f transitions of Ho(III) cation have been detected for1in 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 H(2)ATPA ligand to Ho(III) have been done effectively so that1would have the potential applications in the optical amplification field.