Crystal Structure of K4[H2P2Mo5O21]·2H2O

Abstract

Abstract K4[H2P2Mo5O21]·2H2O crystallizes in monoclinic system, P21/a with a=13.648(4), b=15.591(7), c=10.889(4) Å, β=94.21(2)°, U=2311(1) Å3, Z=4. It contains a discrete pentamolybdodiphosphite anion, [H2P2MO5O21]4−, which has, approximately, a C2v symmetry. Its framework is the same as those found in the pentamolybdodiphosphate and the pentamolybdodiphosphonate anions. The P–O and Mo–O distances are 1.49–1.55 and 1.69–2.46 Å, respectively.