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Issue 9, 2019
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Carbonate and phosphite encaged in frameworks constructed from square lanthanum aminopolycarboxylates and sodium chloride

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Abstract

Novel additives of lanthanum aminopolycarboxylates with inorganic anions, Na12n[La(edta)L]4n·8nNaCl·4nH2O (1: L = HPO32−; 2: L = CO32−) and K12n[La(cdta)(CO3)]4n·35nH2O (3) (H4edta = ethylenediaminetetraacetic acid; H4cdta = cyclohexanediaminetetraacetic acid), were obtained in alkaline solution. Structural analyses reveal that 1 and 2 are isomorphous and contain interesting square structures. HPO32− (CO32−) was encaged in the constructed tetranuclear frameworks. Tetranuclear lanthanum ethylenediaminetetraacetate was further encaged in superstructures of sodium chloride. 3 has a similar square structure, in which edta is replaced by cdta. All complexes are fully characterized via elemental, FT-IR, NMR, thermogravimetric and structural analyses. Solution 13C NMR spectra show that 1 and 2 dissociate into mononuclear units in water. Interestingly, 2 possesses 3.7 Å diameter holes inside its crystals, which can adsorb a small amount of O2 or CO2 selectively. The amounts of O2 and CO2 adsorbed increase gradually from 0.32 and 0.38 mg g−1 at 0.4 bar to 15.90 and 10.54 mg g−1 at 29.9 bar, respectively.

Graphical abstract: Carbonate and phosphite encaged in frameworks constructed from square lanthanum aminopolycarboxylates and sodium chloride

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Publication details

The article was received on 16 Dec 2018, accepted on 28 Jan 2019 and first published on 29 Jan 2019


Article type: Paper
DOI: 10.1039/C8DT04940H
Citation: Dalton Trans., 2019,48, 2959-2966

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    Carbonate and phosphite encaged in frameworks constructed from square lanthanum aminopolycarboxylates and sodium chloride

    S. Wang, S. Gao, J. Dai, Y. Shi, X. Dong, W. Weng and Z. Zhou, Dalton Trans., 2019, 48, 2959
    DOI: 10.1039/C8DT04940H

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