Oxo-vanadium(IV) dihydrogen phosphate : preparation, magnetic study, and heterogeneous catalytic epoxidation

A layered oxo-vanadium(IV) dihydrogen phosphate, {VO(H2PO 4)2} n has been synthesized hydrothermally and characterized by several physicochemical methods. Single-crystal X-ray analysis (crystal system, tetragonal; space group, P4/ ncc; unit cell dimensions, a = b = 8.9632(4), c = 7.9768(32) A) of {V...

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Veröffentlicht in:Langmuir : the ACS journal of surfaces and colloids. - 1992. - 24(2008), 11 vom: 03. Juni, Seite 5970-5
1. Verfasser: Sen, Rupam (VerfasserIn)
Weitere Verfasser: Bera, Rajesh, Bhattacharjee, Ashis, Gütlich, Philipp, Ghosh, Soumen, Mukherjee, Alok K, Koner, Subratanath
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2008
Zugriff auf das übergeordnete Werk:Langmuir : the ACS journal of surfaces and colloids
Schlagworte:Journal Article
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520 |a A layered oxo-vanadium(IV) dihydrogen phosphate, {VO(H2PO 4)2} n has been synthesized hydrothermally and characterized by several physicochemical methods. Single-crystal X-ray analysis (crystal system, tetragonal; space group, P4/ ncc; unit cell dimensions, a = b = 8.9632(4), c = 7.9768(32) A) of {VO(H2PO4) 2} n reveals that the compound has an extended two-dimensional structure. The VO2+ moieties are connected through bridging H 2PO4 (-) ions, and this type of connection propagates parallel to the crystallographic ab plane which gives rise to a layered structure. The layers are staked parallel to the crystallographic c axis with a separation between the layers of ca. 4.0 A. Magnetic susceptibility of {VO(H2PO4)2} n has been measured in the temperature range 2-300 K on a SQUID magnetometer. The magnetic property of {VO(H2PO4)2} n is explicable in the light of a two-dimensional quantum Heisenberg antiferromagnet model. Magnetic pathways are available through the dihydrogen-phosphato bridges within the layer and provide for weak antiferromagnetic interactions. Notably {VO(H2PO4)2} n catalyzes the epoxidation reaction of alkenes with tert-BuOOH in acetonitrile medium under heterogeneous condition 
650 4 |a Journal Article 
700 1 |a Bera, Rajesh  |e verfasserin  |4 aut 
700 1 |a Bhattacharjee, Ashis  |e verfasserin  |4 aut 
700 1 |a Gütlich, Philipp  |e verfasserin  |4 aut 
700 1 |a Ghosh, Soumen  |e verfasserin  |4 aut 
700 1 |a Mukherjee, Alok K  |e verfasserin  |4 aut 
700 1 |a Koner, Subratanath  |e verfasserin  |4 aut 
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