An Exotic Layered Compound Consisting of Interconnected Arsenato‐Polyoxovanadate Clusters: Thermal and Magnetic Properties and Liquid Phase Exfoliation. Issue 1 (24th November 2020)

• Record Type: Journal Article
• Authors: Mahnke, Lisa K.; Stehlíková, Gabriela; Synnatschke, Kevin; Backes, Claudia; Näther, Christian; Bensch, Wolfgang
• Is Part Of: ChemNanoMat. Volume 7:Issue 1(2021)
• Page Start: 78
• Page End: 84
• Publication Date: 2020-11-24
• Subjects: layered antimonato-polyoxovanadates -- magnetocaloric effect -- reversible water uptake/release -- nanosheets -- liquid phase exfoliation; Nanochemistry -- Periodicals; Nanostructured materials -- Periodicals; Nanochemistry; Nanostructured materials; Periodicals; 541.2
• DOI: 10.1002/cnma.202000563
• Languages: English
• ISSNs: 2199-692X

Abstract

Abstract: The compound {[Mn(teta)]4 V16 As4 O42 (H2 O)}n ⋅ 10 H2 O (teta=triethylenetetraamine) was synthesized under solvothermal conditions. The crystal structure consists of layers composed of {V16 As4 O42 } moieties joined by O−Mn−O bridges. The crystal water molecules can be thermally removed and they are reintegrated in humid atmosphere. The water sorption occurs in two steps indicating differing strengths of hydrogen bonding interactions. Investigations of the magnetic properties present evidence that the antiferromagnetic exchange interactions between the spins of the Mn 2+ and of the V 4+ cations are relatively strong. The magnetocaloric effect could be observed but is relatively small due to the antiferromagnetic exchange. Using liquid phase exfoliation, small crystallites with thicknesses as low as 10 nm could be obtained, while larger crystallites exhibit thicknesses of 20–40 nm. Abstract : The crystal water molecules of the layered compound {[Mn(teta)]4 V16 As4 O42 (H2 O)}n ⋅ 10 H2 O (teta=triethylenetetraamine) can be removed reversible. Nanosheets as thin as 10 nm were obtained by liquid phase exfoliation. Applying liquid cascade centrifugation different fractions could be isolated which exhibit different optical properties.