Abstract
The linker 2,5-di(4-pyridyl)thiazolo[5,4-d]thiazole (Dptztz), whose synthesis and structure is described here, was utilized together with benzene-1,3-dicarboxylate (isophthalate, 1,3-BDC2−) for the preparation of the two-dimensional coordination network [Zn(1,3-BDC)Dptztz]·DMF (DMF = dimethylformamide) via a solvothermal reaction. Compound [Zn(1,3-BDC)Dptztz]·DMF belongs to the class of coordination polymers with interdigitated structure (CIDs). The incorporated DMF solvent molecules can be removed through solvent exchange and evacuation such that the supramolecular 3D packing of the 2D networks retains porosity for CO2 adsorption in activated [Zn(1,3-BDC)Dptztz]. The first sorption study of a tztz-functionalized porous metal-organic framework material yields a BET surface of 417 m2/g calculated from the CO2 adsorption data. The heat of adsorption for CO2 exhibits a relative maximum with 27.7 kJ/mol at an adsorbed CO2 amount of about 4 cm3/g STP, which is interpreted as a gate-opening effect.
Highlights
Metal-organic frameworks are an intensively studied class of porous materials
Many different organic functionalities have been introduced into the frameworks either by a priori ligand functionalization or by post synthetic modification [14,15,16]. 4,40 -Biypridine based ligands have been used to construct a diverse set of different topologies [17]. 4,40 -Bipyridine ligands are widely used in the synthesis of open network structures in combination with dicarboxylate ligands via the so called mixed-ligand strategy [18,19]
The successfully synthesized and its crystal structure was determined for the first time
Summary
Metal-organic frameworks are an intensively studied class of porous materials. Due to the immense quantity of possible inorganic and organic building units several applications are discussed (e.g., gas storage and separation, catalysis, sensing and heat transformation) [1,2,3,4,5,6,7,8,9,10,11,12,13]. The tztz unit was incorporated into photoactive materials due to its rigid and planar structure and electron deficiency. Both Maes et al and Dessi et al reviewed the synthetic procedures to obtain tztz-containing small molecules and polymers as well as their application in the field of organic. The tztz unit has been reported only in relatively few coordination relatively few coordination compounds (15 hits in the CCDC database). N,N’-(thiazolo[5,4-d]thiazole-2,5-diylbis(4,1-phenylene))bis(N-(pyridine-4-yl)pyridin-4-amine into a two-dimensional zinc MOF and studied its electrochemical properties [36]. Synthesized tztz-linked microporous organic polymers, which ligand [37]. Synthesized tztz-linked microporous organic polymers, which show a high CO 2:N22 selectivity selectivity [38].
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