Selective CO2 Adsorption at Low Pressure in Nitrogen-Rich Copper(II) Coordination Polymers

Author(s)

Tavares Alves Martins, Daniel Oliveira ; Freitas, Rafael Sa ; Da Costa Ferreira, Ana Maria

• Document type: Journal article
• Source: CHEMISTRYSELECT; v. 7, n. 31, p. 9-pg., 2022-08-19.

Abstract

Herein, a series of polymeric copper(II) complexes were obtained using four different triazoles: 3-amino-1,2,4-triazole (HL1), 3,5-diamino-1,2,4-triazole (HL2), 3-amino-1,2,4-triazole-5-carboxylic acid (H(2)L3) and 1,2,4-triazole-3-carboxylic acid (H(2)L4); through solvothermal conditions, under controlled pressure and high temperature, following usual procedures described in the literature. These triazoles were chosen to exploit their different coordination modes to copper(II) metal centres to obtain interesting structures and varied gas adsorption selectivity. The isolated materials were characterized by common spectroscopic techniques (IR, diffuse reflectance UV-Vis, EPR), CHN analyses, X-ray diffraction (XRD), thermogravimetric analyses, and SQUID magnetometry to give an insight into their structure and composition. Besides, they had their BET surface area determined by nitrogen adsorption-desorption isotherms, to assess their porosity. At last, their capacity to adsorb carbon dioxide selectively was also evaluated, in line with those reported for similar systems in the literature. Although having small surface area, these compounds are able to adsorb CO2 selectively at very low pressure (under 600 mbar). (AU)

• FAPESP's process: 11/50318-1 - Development of compounds with pharmacological or medicinal interest and of systems for their transport, detection and recognition in biological media
• Grantee: Ana Maria da Costa Ferreira
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 13/07937-8 - Redoxome - Redox Processes in Biomedicine
• Grantee: Ohara Augusto
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 18/21510-0 - Synthesis and modification of new metal-organic frameworks with large surface areas and novel topologies
• Grantee: Daniel de Oliveira Tavares Alves Martins
• Support Opportunities: Scholarships abroad - Research Internship - Master's degree
• FAPESP's process: 17/19071-6 - Studies of metal complexes containing triazole ligantes aiming the obtaining of multifunctional magnetic MOFs
• Grantee: Daniel de Oliveira Tavares Alves Martins
• Support Opportunities: Scholarships in Brazil - Master