Synthèse et caractérisation structurale d'un phosphate d'indium In3P2O8 présentant des paires In–In

Abstract

The crystal structure of the new indium phosphate In3P2O8 has been determined from single-crystal data. The unit cell is cubic [space group I{\bar 4}3d (Z = 8)] with a = 11.152 (1) Å. The structure is characterized by a three-dimensional arrangement of isolated PO4 3− tetrahedra forming the anionic network, while the electroneutrality is insured by (In—In)4+ cationic pairs. The In—In distance, equal to 2.630 (1) Å, is the shortest In—In bond ever found. Powdered In3P2O8 can be synthesized from a mixture of 4 InPO4:1 In2O3 after thermal reduction under H2.