The compound Tl4Cu4(P2O7)(3), a new three-dimensional structure with interconnected tunnels

Tl4Cu4(P2O7)(3) has the following crystallographic features: orthorhombic s pace group Pcca with a = 20.171(2), b = 10.558(1), c = 9.676(1) Angstrom an d Z = 4. A total of 1303 reflections with I>2(I) were used for structure so lution and refinements. The agreement factors R-1 and WR2 converged to 0.04 0 and 0.093, respectively. GOF = 1.103. Tl4Cu4(P2O7)(3) presents a three-di mensional structure, its anionic framework consists of corner sharing CuO5 polyhedra and P2O7 groups delimiting several types of interconnected tunnel s wherein the thallium cations reside. (C) 2000 Editions scientifiques et m edicales Elsevier SAS. All rights reserved.