Synthesis and characterization of a 2-periodic cadmium-based metal-organic framework: A study on reversible water adsorption

Nabanita Chatterjee; Marcello Mutti; Paolo Pelagatti; Clive L Oliver

doi:10.1016/j.heliyon.2022.e10299

Synthesis and characterization of a 2-periodic cadmium-based metal-organic framework: A study on reversible water adsorption

Heliyon. 2022 Aug 19;8(9):e10299. doi: 10.1016/j.heliyon.2022.e10299. eCollection 2022 Sep.

Authors

Nabanita Chatterjee¹, Marcello Mutti^{1

2}, Paolo Pelagatti², Clive L Oliver¹

Affiliations

¹ Department of Chemistry, University of Cape Town, Rondebosch, Cape Town, South Africa.
² Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale, Università di Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy.

Abstract

A previously-reported cadmium-based two-periodic metal-organic framework [Cd_1.5(BTC)(H₂O)_4.5] _n ·nH₂O (CP1) has been re-synthesized, where H₃BTC = 1,3,5-benzenetricarboxylic acid. CP1 was characterized with single crystal X-ray diffraction (SCXRD), powder X-ray diffraction (PXRD) followed by various thermal analyses such as thermogravimetric analysis (TGA), hot stage microscopy (HSM) and differential scanning calorimetry (DSC). CP1 is composed of 2-periodic layers, which are interdigitated. Heating can effectively remove the uncoordinated and coordinated water molecules resulting in an amorphous product CP1'. The original framework can be regenerated by readsorption of water from the atmosphere, indicating that the dehydration is reversible.

Keywords: 2-periodic; Metal-organic frameworks; Water sorption.