CRYSTAL-STRUCTURE OF MONOAQUATETRA(3,5-DIMETHYLPYRAZOLE)COPPER(II) NITRATE [CU(C5H8N2)(4)(H2O)](NO3)(2)

The crystal structure of monoaquatetra(3,5-dimethylpyrazole)copper(II) nitrate [Cu(C5H8N2)(4)(H2O)]X(NO3)(2) is determined (Syntex P2(1) aut omated diffractometer, theta/2 theta scan mode within the 2 theta rang e 3-55 degrees at a variable rate V-min = 5 deg/min, lambda MoKalpha, graphite monochromator, 5170/2349 measured/observed I-hkl, absorption taken into account experimentally, R(aniso) = 0.069). The parameters o f the monoclinic unit cell are as follows: a = 23.569(4), b = 8.177(2) , c = 17.250(6) Angstrom, beta = 121.65(2)degrees, V = 2830(2) Angstro m(3), Z = 4C(20)H(34)CuN(10)O(7), d(calc) = 1.388 g/cm(3). The space g roup P2(1) was chosen by the process of structure solution and refinem ent. The structure is of island type. The complex cations [CuL(4)(H2O) ](2+) and the (NO3)(-) anions form mired layers in the planes parallel to (010) at y congruent to 0.36 and 0.87. The central atoms of two cr ystallographically independent complex cations [CuL(4)(H2O)](2+) are s urrounded with five atoms (O-H2O+4N) with average Cu-O-H2O and Cu-N di stances of 2.23(2) and 2.04(4) respectively, which form distorted trig onal bipyramids. The average bond lengths in the pyrazole rings are th e following: N-N = 1.40 N-C = 1.40, (C-C)(ring) = 1.42 and C-ring-C-Me = 1.50 Angstrom.