Issue 37, 2019

Ln-MOFs using a compartmental ligand with a unique combination of hard–soft terminals and their magnetic, gas adsorption and luminescence properties

Abstract

The present work is part of our ongoing quest for developing multifunctional lanthanide–organic hybrid materials using non-conventional soft N-rich pyridyl–pyrazole-based ligands. Accordingly, we have embarked on an interesting venture of generating lanthanide-metal–organic frameworks (MOFs) using a new N-rich compartmental type ligand. It is imperative to note that compartmental ligands are seldom used in MOF synthesis, let alone lanthanide-MOFs. The terminals of the newly designed titular ligand comprise two contrasting functional moieties, a hard carboxylic group and a soft chelating pyridyl–pyrazole moiety. Their contrasting coordination behaviours are manifested in two isostructural lanthanide-based MOFs (Ln = Gd (1), Dy (2)). Single crystal X-ray analyses reveal archetypal graphite-like framework formation containing substantial pores inside the network with a corresponding moderately high surface area and N2 and CO2 gas sorption properties. Another important aspect of lanthanide-MOFs is magnetism and the results of the present work are highly encouraging. The occurrence of the magnetocaloric effect (MCE) of mononuclear Gd-based MOF-1 further boasts the notion of generating magnetic materials. Dy-based MOF-2, on the other hand, features single ion magnet (SIM) behavior, as further confirmed by ac susceptibility measurements.

Graphical abstract: Ln-MOFs using a compartmental ligand with a unique combination of hard–soft terminals and their magnetic, gas adsorption and luminescence properties

Supplementary files

Article information

Article type
Paper
Submitted
02 Jul 2019
Accepted
19 Aug 2019
First published
19 Aug 2019

CrystEngComm, 2019,21, 5665-5672

Ln-MOFs using a compartmental ligand with a unique combination of hard–soft terminals and their magnetic, gas adsorption and luminescence properties

S. Bhattacharya, S. Bala and R. Mondal, CrystEngComm, 2019, 21, 5665 DOI: 10.1039/C9CE01026B

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