✦ LIBER ✦

The New Mercury Vanadium Phosphate Hg4VO(PO4)2 Containing Hg2+2 Dumbbells: Crystal Structure and Thermal and Magnetic Properties

✍ Scribed by E. Le Fur; J.Y. Pivan

Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 437 KB
Volume: 158
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.2000.9102

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✦ Synopsis

Crystals of the title compound were obtained from hydrothermal treatments. Hg 4 VO(PO 4 ) 2 crystallizes in orthorhombic symmetry with parameters a ‫)2(4831.7؍‬ A > , b‫)3(4576.61؍‬ A > , c‫)5(7970.9؍‬ A > , Z‫,4؍‬ and space group Pnma (No. 62). The crystal structure was determined from single crystal di4ractometer data to residuals R[F 2 '2 F 2 ‫,440.0؍]‬ wR(F 2 ‫.050.0؍)‬ The VPO framework for Hg 4 VO(PO 4 ) 2 is one-dimensional and consists of hexagonal tungsten bronze (HTB)-like chains of distorted vanadium octahedra that share vertices with PO 3؊ 4 to generate in5nite [VO(PO 4 ) 2 ] 4؊ blocks as found in the structure K 6 [VO(PO 4 )] 2 (V 2 O 3 ) 2 (H x P 2 O 7 ). Mercury, present as Hg 2؉ 2 linear dimers with d(Hg}Hg)‫)4(5215.2؍‬ A > , ensures the connectivity between the [VO(PO 4 ) 2 ] 4؊ blocks. Susceptibility measurements are consistent with V 4؉ ions and thermal behavior is explained in terms of successive disproportionation of the title compound to elemental mercury and unknown HgVPO:s phases upon heating. A comparison with related MVPOs is presented.

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