Structure, optical transition analysis and magnetic study of lanthanide based metal-organic framework: holmium bi-tartrate trihydrate

Abstract

This study presents the hydrothermal synthesis of holmium bi-tartrate trihydrate single crystals.
The crystal structure and morphology were determined using single crystal X-ray analysis and
field emission scanning electron microscopy, respectively. Fourier transform infrared spectroscopy
was employed to identify the ligand phase. The thermal stability was assessed through differential
scanning calorimetry. The effect of ligand on the incorporated paramagnetic center is discerned
by reckoning the magnetic moment of the same. Judd-Ofelt theory was utilized to analyze optical
transitions and calculate excited state properties. The complex exhibited violet and red emissions,
attributed to ligand-based and metal-based luminescence , respectively. The absence of antenna
effect was due to a significant energy gap between the resonance energy state, 5S2 of the Ho(III) ion
and the triplet state of the coordinated tartrate ligand. The synthesized MOF’s prolonged radiative
lifetime holds promise for laser technologies and environmental monitoring applications.

Holmium-Containing Metal-Organic Frameworks as Modifiers for PEBA-Based Membranes

“…Furthermore, two sharp peaks at 716 and 652 cm −1 are due to vibrations of holmium nodes surrounded by oxygen atoms of the carboxylic groups of the linker and the hydroxyl group of ethanol. For many MOFs, similar values of the vibrational energy of a metal node have been determined [ 17 , 103 , 104 , 105 ].…”