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Noncomplexed Cucurbituril-Mediated Structural Evolution of Layered Uranyl Terephthalate Compounds.
- Source :
-
Inorganic chemistry [Inorg Chem] 2020 Jan 06; Vol. 59 (1), pp. 943-955. Date of Electronic Publication: 2019 Dec 09. - Publication Year :
- 2020
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Abstract
- Template synthesis is one of the most feasible ways to explore new uranyl compounds with intriguing structures and properties. Here we demonstrate the preparation of six novel "sandwichlike" uranyl coordination polymers (UCPs) based on two-dimensional uranyl-terephthalate acid (H <subscript>2</subscript> TP ) networks using CB n ( n = 5, 6, 8) as template ligands in the presence of different cations (Na <superscript>+</superscript> , K <superscript>+</superscript> , Cs <superscript>+</superscript> , or H <subscript>2</subscript> N(CH <subscript>3</subscript> ) <subscript>2</subscript> <superscript>+</superscript> ). Compound 1 ([UO <subscript>2</subscript> ( TP ) <subscript>2</subscript> ][Na <subscript>2</subscript> (CB5)(H <subscript>2</subscript> O)](H <subscript>2</subscript> O) <subscript>5</subscript> ) is composed of layered uranyl- TP networks with the complex of CB5 and sodium cations as template ligands. In compound 2 ([(UO <subscript>2</subscript> ) <subscript>2</subscript> ( TP ) <subscript>3</subscript> ] <subscript>2</subscript> (CB6)(H <subscript>2</subscript> O) <subscript>10</subscript> ), CB6 located between uranyl- TP networks contacts them by π-π interactions and hydrogen bonds. Compound 3 ([(UO <subscript>2</subscript> ) <subscript>2</subscript> ( TP ) <subscript>3</subscript> ] <subscript>2</subscript> [Na <subscript>2</subscript> (H <subscript>2</subscript> O) <subscript>10</subscript> (CB6)]) is the same as compound 2 except for sodium cations bonding with CB6. Similarly in compound 4 ([(UO <subscript>2</subscript> ) <subscript>2</subscript> ( TP ) <subscript>3</subscript> ][Cs(H <subscript>2</subscript> O) <subscript>3</subscript> (CB6)]), CB6 is a capsulelike structure capped with two cesium cations and interacts with uranyl- TP networks through π-π and C-H···π interactions. Compound 5 ([(UO <subscript>2</subscript> ) <subscript>2</subscript> ( TP ) <subscript>3</subscript> (HCOO) <subscript>2</subscript> ][K(H <subscript>2</subscript> O) <subscript>2</subscript> (CB5)] <subscript>2</subscript> [H <subscript>2</subscript> N(CH <subscript>3</subscript> ) <subscript>2</subscript> ] <subscript>2</subscript> (CB6)(H <subscript>2</subscript> O) <subscript>6</subscript> ) consists of both templates of CB6 and CB5 in which each CB5 is capped with one potassium cation while the H <subscript>2</subscript> N(CH <subscript>3</subscript> ) <subscript>2</subscript> <superscript>+</superscript> cation is held at CB6 portals. In compound 6 ([(UO <subscript>2</subscript> ) <subscript>2</subscript> ( TP ) <subscript>3</subscript> ] <subscript>2</subscript> [UO <subscript>2</subscript> ( TP ) <subscript>2</subscript> (H <subscript>2</subscript> O) <subscript>2</subscript> ][Cs(CB8) <subscript>3</subscript> (H <subscript>2</subscript> O) <subscript>4</subscript> ](H <subscript>2</subscript> O) <subscript>16</subscript> ), CB8 ligands are connected by cesium cations to form a triangle motif and are further located between the uranyl- TP networks as template agents. All of the 2D layered structures with free CB n or cation-anchored CB n intercalate into the laminates of uranyl-terephthalate and shows a cucurbituril-mediated structural evolution. The regulating role of CB n as structure-directing template agents for the construction of layered UCPs through outer-surface interactions with layers of uranyl terephthalate is demonstrated, especially for the case of CB6 with contractive interlayer spacing.
Details
- Language :
- English
- ISSN :
- 1520-510X
- Volume :
- 59
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Inorganic chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 31815447
- Full Text :
- https://doi.org/10.1021/acs.inorgchem.9b03215