Synthesis and Crystal Structure of Copper(II) Nitrato Complexes
NO[Cu(NO3)3], Na2[Cu(NO3)4], and Ag2[Cu(NO3)4]

K. O. Znamenkov, I. V. Morozov, and S. I. Troyanov

Chemistry Department, Moscow State University, Vorob’evy gory, Moscow, 117234 Russia

Received August 1, 2003

Abstract—The nitrato cuprates NO[Cu(NO3)3] (I), Na2[Cu(NO3)4] (II), and Ag2[Cu(NO3)4] (III) were pre-
pared by crystallization from nitric acid solutions of Cu(NO3)2 or mixtures of Cu(NO3)2 and MNO3 in a desic-
cator above phosphorus(V) oxide. The crystal structures of compounds I–III were determined by X-ray crys-
tallography. I, space group P21/m, a = 4.658(1) Å, b = 11.102(3) Å, c = 7.009(2) Å, = 100.83(2)°, V =
356.0(2)Å3 , Z = 2, R1 = 0.0204; II, space group frame021/c, a = 7.021(2) Å, b = 7.661(2) Å, c = 9.033(3) Å, =
90.42(3)°, V = 485.9(2) Å3 , Z = 2, R1 = 0.0250; III, space group Pframe1, a = 7.580(2) Å, b = 8.169(3) Å, c =
8.558(3)Å, = 65.59(3)°, = 87.01(3)°, = 86.10(3)°, V = 481.3(3) Å3 , Z = 2, R1 = 0.0282. The structure ofI
contains network [Cu(NO3)3frame2 layers and NO+ cations arranged between the layers. The copper atom forms
a distorted octahedral environment, the average Cu–O distance being 2.16 Å. The similar islet structures I and
III contain [Cu(NO3)4]2– anions and Na+ (Ag+) cations. The copper atom has a centrosymmetrical square envi-
ronment formed by the O atoms of the four nitrato groups with an average Cu–O distance of 1.97 Å (II) and
1.96 Å (III).

Pleiades Publishing home page | journal home page | top

If you have any problems with this server, contact webmaster.