Structure of lithium copper pyrophosphate

Li 2 CuP 2 O 7 , M r =251. 37, monoclinic, I2/a, a=14.068 (2), b=4.8600 (8), c=8.604 (1) A, β=98.97 (1) o , V=581. 1 (3) A 3 , Z=4, D x =2.873 Mg m -3 , λ(Mo Kα)=0.71073 A, μ=4.2911 mm -1 , F(000)=484, T=295 (1) K, R= 0.048 for 414 observed reflections [I>2σ(I)]. The pyrophosphate anion is known to adopt varied conformations in different environments. In the present structure analysis, the bridge P-O-P angle is 121.5°, the P-O(bridge) bond length is 1.618A and the P-O(terminal) bond lengths vary between 1.483 and 1.530A