Structures of the Monohydrate and Dihydrate of (Bidentate Pyrophosphato) trans-Diammine cis-Diaqua Chromium(III)

OC-6-32)-Diamminediaqua(pyrophos- phato(3 -))chromium(III) monohydrate, (Cr(NH3)2- (H20)2(HP207)).H20, Mr = 315" 1, triclinic, P1, a = 7"127 (2), b = 8"390 (2), c = 9"619 (2) A, a = 72.14 (2), fl = 98"86 (2), y = 76"98 (3) °, V = 517.7 (3)/~ 3, Z = 2, Dx = 2.02 g cm -3, A(Cu Ka) = 1"5418 A, /z = 129 cm- 1, F(000) = 322, T = 293 K. (OC-6-32)-Diamminediaqua(pyrophosphato(3-))- chromium(III) dihydrate, 0"5{(Cr(NH3)2(H20)2- (HPzOT)).2H20}, Mr = 0.5(333.1), monoclinic, C2/m, a= 13.118(3), b= 12.101(3), c=7.436(2)A, /3= * To whom correspondence should be addressed. Present