Heterometallic uranyl-organic frameworks incorporating manganese and copper: Structures, ammonia sorption and magnetic properties. (1st September 2021)

• Record Type: Journal Article
• Authors: Wen, Ge-Hua; Zou, Qian; Huang, Xin-Da; Zhang, Kun; Bao, Song-Song; Zheng, Li-Min
• Is Part Of: Polyhedron. Volume 205(2021)
• Publication Date: 2021-09-01
• Subjects: Uranyl phosphonate -- Copper -- Manganese -- Magnetic -- Sorption; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2021.115327
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: Heterometallic uranyl phosphonates [Cu2 (UO2 )3 (2-pmbH)2 (2-pmb)2 (H2 O)4 ]·2H2 O (1 ) and [Mn3 (UO2 )6 (2-pmb)6 (H2 O)8 ]·10H2 O (2 ) [2-pmbH3 = 2-(phosphonomethyl)benzoic acid] possess layered and open-framework structures, respectively. Both show dominant antiferromagnetic interactions. The thermally activated sample of 2 displays permanent porosity with strong adsorption capability toward NH3 . Abstract: Incorporating transition metal ions into uranyl phosphonate frameworks can bring not only new structure types but also interesting physical or chemical properties. Herein we report two heterometallic uranyl carboxyphenylphosphonates, namely, [Cu2 (UO2 )3 (2-pmbH)2 (2-pmb)2 (H2 O)4 ]·2H2 O (1 ) and [Mn3 (UO2 )6 (2-pmb)6 (H2 O)8 ]·10H2 O (2 ) [2-pmbH3 = 2-(phosphonomethyl)benzoic acid]. Compound 1 shows a two-dimensional layered structure in which uranyl-PO3 chains are linked by {Cu2 O2 } dimers. Within the uranyl-PO3 chain, {UO6 } tetragonal bipyramids and edge-sharing dimers of {UO7 } pentagonal bipyramids are connected by edge-sharing {PO3 C} tetrahedra. Compound 2 possesses a unique 3D open framework structure, where the Mn-layers are pillared by uranyl-PO3 chains. The uranyl-PO3 chain in 2 is very different from that in 1, which contains trimers of edge-sharing {UO7 } and {UO8 } polyhedra and {PO3 C} linkages. While the Mn-layer consists of chains of {MnO6 } octahedra bridged alternatively by carboxylate and phosphonate groups, which are inter-connected by organic moieties of 2-pmb 3- . The thermally activated sample of 2 displays strong adsorption capability toward NH3 . Magnetic studies revealed dominant antiferromagnetic interactions between the metal centers in both compounds.