Carbonate and phosphite encaged in frameworks constructed from square lanthanum aminopolycarboxylates and sodium chloride. Issue 9 (11th February 2019)

• Record Type: Journal Article
• Authors: Wang, Si-Yuan; Gao, Song; Dai, Jun-Wei; Shi, Yan-Ru; Dong, Xin; Weng, Wei-Zheng; Zhou, Zhao-Hui
• Is Part Of: Dalton transactions. Volume 48:Issue 9(2019)
• Page Start: 2959
• Page End: 2966
• Publication Date: 2019-02-11
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8dt04940h
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Lanthanum aminopolycarboxylates, Na12 n [La(edta)L]4 n ·8 n NaCl·4 n H2 O (1 : L = HPO3 2− ;2 : L = CO3 2− ) and K12 n [La(cdta)(CO3 )]4 n ·35 n H2 O (3 ), with square structures were obtained. Carbonate2 possesses 3.7 Å diameter holes that can adsorb a small amount of O2 or CO2 selectively. Abstract : Novel additives of lanthanum aminopolycarboxylates with inorganic anions, Na12 n [La(edta)L]4 n ·8 n NaCl·4 n H2 O (1 : L = HPO3 2− ;2 : L = CO3 2− ) and K12 n [La(cdta)(CO3 )]4 n ·35 n H2 O (3 ) (H4 edta = ethylenediaminetetraacetic acid; H4 cdta = cyclohexanediaminetetraacetic acid), were obtained in alkaline solution. Structural analyses reveal that1 and2 are isomorphous and contain interesting square structures. HPO3 2− (CO3 2− ) 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 13 C NMR spectra show that1 and2 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.