between Nd and Rb (see Fig. la). This group of atoms is found on a two-fold screw axis. Two oxygen atoms in the N2 nitrate groups are bound to one Nd atom, while the third oxygen atom is bound only with Rb atoms (see Fig. lb). In this case, the Nd--O distances are somewhat smaller than the analogous values for the oxygen atoms of the NI nitrate groups. The rubidium atoms are located in a 12-fold position and are surrounded by ten oxygen atoms at distances of from 2.943 to 3.298 A (the other Rb--O distances > 4 A). Their environment also differs from the two cases indicated above: Rb is surrounded by two equivalent O1 atoms of the N1 nitrate group and eight oxygen atoms (03, O4, and 05) of the N2 nitrate group. The nitrate groups participating in the coordination sphere of Nd and Rb remain virtually planar. The extrusions from the planes drawn through the three corresponding oxygen atoms are 0.001 and 0.007 A, respectively. The bridging 02 atoms connect the [(NO3)6]3- units into [Nd2(NOs)9] s- complexes. Schematically, this complex is conveniently represented as a three-lobed figure designated in Figs. 2 and 3 by the letters ABCD. Each lobe of the complex consists of two Nd atoms with the corresponding oxygen environment. Each Nd atom, in turn, takes part in three complexes, which, upon their combination, form a three-dimensional structure as large and small spirals parallel to the z-axis about the two-fold and four-fold screw axes (see Figs. 2 and 3). The rubidium atoms are located in cavities bounded by the large spirals and form their coordination polyhedra by additional bonds within the structure. LITERATURE CITED 1. V.G. Shevchuk, A. G. Dryuchko, N. V. Bunyakina, and N. N. Kiser, Zh. Neorg. Khim., 29, No. 9, 2439-2442 (1984). 2. V.K. Pecharskii, P. Yu. Zavalii, L. G. Aksrrud, et al., Vestn. L'vovsk. Univ., Ser. Khim., No. 25, 9 (1984). 3. W.T. Carnall, S. Siegel, J. R. Terraro, et al., Inorg. Chem., 12, No. 3, 560-564 (1973). CRYSTAL AND MOLECULAR STRUCTURE OF THE ADDUCT OF CUPRIC ACETATE WITH 2-AMINOTHIAZOLE A. S. Antsyshkina, M. A. Porai-Koshits, D. A. Garnovskii, A. P. Sadimenko, O. A. Osipov, and A. D. Garnovskii UDC 541.49+539.29+547.7 In the case of the adducts of cupric acetate with 2-amino derivatives of pyridine [Cu2(OAc)4(NH2--Py)2 and Cu2(OAc)4(NH2--Py)2-C4HsO2] [1, 2], 1-methylbenzimidazole [Cu(OAc)2(CeH4N2--(CH3)C--NH2)2], and l-heptyl- benzimidazole [Cu(OAc)2(CeH4N2(CTHxs)C--NH2)2] [3], we have shown that one of the hydrogen atoms of the primary amino group participates in hydrogen bonding with the formation of six-membered M,H rings. As indicated in our previous work, the formation of such rings accounts for the decrease in the frequencies of the stretching vibrations of the primary NH 2 group (at 3500-3100 cm-1) in the complexes in comparison with the initial 2-aminoheterocycles. Since the change in the ligand frequencies upon its coordination is still considered as evidence of the participation of the NH~ fragment in coordination of the metal [4], we carried out the synthesis and an x-ray diffraction structural analysis of the adduct of cupric acetate with 2-aminothiazole, for which Surech and Padma [4] predicted coordination of Lewis acids through the amine nitrogen. The synthesis of bis(2-aminothiazole)tetraacetatodicopper [Cu2(OAc)4(NH~C3H2NS)2] (I) was carried out by mixing solutions of 5 mmoles cupric acetate in 15 ml hot methanol and of 5 mmoles 2-aminothiazole in 10 ml hot methanol. After cooling, the green crystalline precipitate of the complex was filtered off and washed several times with hot ethanol and then dried in a vacuum dessicator. This product decomposes at 150~ Found: C, 30.05; H, 3.81; N, 9.77; Cu, 23.41%. Calculated for C14H2oOsN4S2Cu2: C, 29.78; H, 3.54; N, 9.93; Cu, 22.69%. The molecular adduct of 2-aminothiazole with cupric acetate was isolated by recrystallization of the complex from dioxane. The IR spectra were taken in vaseline oil on a UR-20 spectrometer at 400-4000 cm -1. Institute of General and Inorganic Chemistry, Academy of Sciences of the USSR. Rostov State University. Translated from Zhurnal Strukturnoi Khimii, Vol. 30, No. 6, pp. 155-159, November-December, 1989. Original article submitted June 23, 1987. 0022-4766/89/3006-1005 $12.50 9 Plenum Publishing Corporation 1005