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Structure of PbIISnIV(PO4)2: Stereochemical Activity of the Lead II Lone Pair

โœ Scribed by E. Morin; G. Wallez; S. Jaulmes; J.C. Couturier; M. Quarton

Book ID
102605324
Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
403 KB
Volume
137
Category
Article
ISSN
0022-4596

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โœฆ Synopsis

Flux-grown single crystals of the new compound PbSn(PO 4 ) 2 have been studied by X-ray diffraction. It crystallizes in monoclinic space group P2 1 /n (No. 14), with cell parameters a โ€ซุโ€ฌ 4.861(6) A > , b โ€ซุโ€ฌ 14.75(2) A > , c โ€ซุโ€ฌ 8.80(2) A > , โ€ซุโ€ฌ 93.0(1)ยฐ, Z โ€ซุโ€ฌ 4. Its structure is related to the yavapaiite type with a skeleton made up of corner-linked SnO 6 octahedra and PO 4 tetrahedra, but the lead atoms are located in double tunnels instead of sheets. An active Pb II lone pair has been localized from electrostatic interactions in order to explain this original structure.

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โœ Sophie Giraud; Jean-Pierre Wignacourt; Michel Drache; Guy Nowogrocki; Hugo Stein ๐Ÿ“‚ Article ๐Ÿ“… 1999 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 300 KB

Pb 4 BiO 4 PO 4 was prepared by heating a stoichiometric mixture of (NH 4 ) 2 HPO 4 , PbO, and Bi 2 O 3 at 700ยฐC for 4 days with intermediate grinding. The material melts congruently at 805ยฐC; single crystals were obtained by slow cooling of a melt. The compound is triclinic, P1 , a โ€ซุโ€ฌ 6.215(1) A s