A Further Extension of Pnictide Oxide Chemistry - Synthesis and Structure of La2AuP2O

作者：Eul Matthias; Moeller Manfred H; Hoffmann Rolf Dieter; Jeitschko Wolfgang; Poettgen Rainer

来源：Zeitschrift fur Anorganische und Allgemeine Chemie, 2012, 638(2): 331-335.

DOI：10.1002/zaac.201100494

• Phosphide oxides
• Rare earth compounds
• Crystal chemistry
• Lanthanum
• Gold

The phosphide oxide La2AuP2O was synthesized from lanthanum filings, dried La2O3, gold pieces, and ground red phosphorus in the ideal 1.33:0.33:1:2 ratio in an evacuated silica tube at 1473 K. Small single crystals were obtained by recrystallization in a NaCl/KCl flux. The structure was determined on the basis of single-crystal X-ray diffractometer data: new type, C2/m, a = 1537.3(3), b = 427.39(8), c = 1009.2(2) pm, beta = 131.02(1) degrees, wR2 = 0.046, 1102 F2 values, 38 variables. La2AuP2O contains two striking structural motifs: The oxygen atoms are located in La4 tetrahedra. The latter are cis-edge-shared forming polymeric cationic [La2O]4+ chains. These cationic units are separated and charge-balanced by [AuP2]4 polyanions which have monovalent gold in distorted trigonal planar phosphorus coordination. Two crystallographically independent phosphorus sites occur in the polyanion, i.e. isolated P3 besides dumb-bells P24 (P2P2 223 pm). La2AuP2O, which crystallizes in the form of ruby red transparent crystals, is an electron precise phosphide oxide (4La3+)(2Au+)(2P3)(P24)(2O2).

• 出版日期2012-2