Recent Advances in s-Block Metal Carboxylate Networks

A rapid microwave-assisted synthesis of a sodium–cadmium metal–organic framework having improved performance as a CO2 adsorbent for CCS

“…15 Compared to conventional solvothermal synthesis, microwave-assisted methods can sharply reduce the overall processing time, which, combined with the high yield usually obtained, significantly rises the energy efficiency of industrial production processes. 15,16 We report herein on an new, easy and rapid microwaveassisted method to synthesize the heterobimetallic sodiumcadmium organic framework [Cd 3 Na 6 (BTC) 4 (H 2 O) 12 ] H 2 O and, moreover, we show that the microwave-assisted procedure improves gas adsorption properties of the obtained material. With a view to increase knowledge about the prospective use of alkali metal-organic frameworks as carbon dioxide adsorbents for CCS, the gas adsorption properties of this newly prepared MOF were also investigated.…”

“…Nevertheless, that can be avoided by simultaneous incorporation of s-block elements and other metal centres, which can lead to tridimensional heterobimetallic MOFs containing the desired alkaline (or alkaline-earth) metal cation. 12 Following this approach, Fu et al 14 have recently reported the synthesis of a novel sodiumcadmium organic framework having narrow channels, and which shows permanent porosity. This sodium-cadmium MOF has the composition [Cd 3 Na 6 (BTC) 4 (H 2 O) 12 ] H 2 O, crystallizes in the tetragonal space group P4 2 /n (because complex connection between structural units lowers the otherwise cubic symmetry, P 3m), and shows a tridimensional structure formed by two interpenetrated [Cd 3 (BTC) 4 ] open frameworks bridged together by {Na 3 O 12 } trimmers (Fig.…”

“…The results are discussed in the broader context of relevant data reported in the literature for CO 2 adsorption on both, other MOFs and cation-exchanged zeolites. 12 ] H 2 O The sodium-cadmium MOF described herein was synthesized following a similar procedure to that described by Fu et al, 14 except that we used microwave heating of the reaction mixture instead of the conventional electric heating used by those authors. The reaction mixture consisted of 4.0 mmol of cadmium acetate dihydrate (Sigma-Aldrich, 98%), 16 mmol of trimesic acid (Aldrich, 95%), 48 mmol of sodium hydroxide (Panreac, 97%), 14 ml of N,N'-dimethylacetamide (DMA) (Sigma-Aldrich, 99,5%) and 18 ml of deionized water, which were mixed inside the 50 ml Teflon vase of the autoclave.…”

“…The prepared sample was stored under ambient conditions (average relative humidity of about 50% and room temperature). For comparison, a sample of [Cd 3 Na 6 (BTC) 4 (H 2 O) 12 ] H 2 O was also synthesized following the procedure previously reported by Fu et al, 14 which involved using conventional electric heating, instead of microwave heating, and keeping the reaction mixture for 5 days at 403 K. Hereafter, the sample prepared using conventional electric heating will be termed (Na,Cd)-MOF(CEH) to differentiate it from the sample prepared under microwave heating that will be termed (Na,Cd)-MOF.…”

Modulating the MII/Pyrimidine‐4,6‐dicarboxylato System by Metal, Solvent and Temperature Variation

“…They are capable of interacting strongly with common gas guest molecules, and some examples of isostructural members of well-known MOFs have already been prepared. [40][41][42] Concerning the pmdc ligand, the only example corresponds to a Ca-pmdc compound that exhibits 1D chains in its crystal structure (Capmdc-aq). The chains resemble those found in compound 1, with the main difference being a fourth water molecule bound to the metal, [43] such that the angle among the Ca-pmdc chain is increased (117.6 vs. 64.3°for Ca and Cd compounds, respectively) (see the Supporting Information).…”