CRYSTAL-STRUCTURE OF GMA(2)-NITRATO-BIS(1-ETHYLTETRAZOLE-N-4)COPPER(II) CU(C3H6N4)(2)(NO3)(2)[CU(C3H6N4)(2)(NO3)(NO3)(2 2)](INFINITY)/

The complex compound of copper(II) nitrate with 1-ethyltetrazole (ettz ), Cu(C3H6N4)(2)(NO3)(2), is studied by X-ray diffraction analysis ('' Syntex P2(1)'' automatic diffractometer, CuKalpha radiation, graphite monochromator, theta/2 theta scan mode with V-min = 3.91 deg/min, the total number of data collected 3544 l(hkb) including 3141 nonextinct I -hkl > 0, a correction for absorption (mu = 25.08 cm(-1)) applied by i ntegrating over the crystal faces). The parameters of the orthorhombic unit cell (space group Peen) are a = 15.436(3), b = 20.198(5), c = 19 .587(3) Angstrom, V-cell = 6107(2) Angstrom(3), Z = 16, d(calc) = 1.67 0 g/cm(3). The two crystallographically independent copper atoms have a distorted octahedral environment (coordination node is CuN2O4), coor dination number (CN) is 6 = 4 + 2. In the equatorial plane, two nitrog en atoms of ettz and two oxygen atoms of NO3- groups are trans to each other; Cu-N = 1.983(8), C-O-NO3- = 1.978(7) Angstrom (average). The n itrate groups fulfill chelate and bridging functions, complementing th e coordination polyhedra of the copper atoms to distorted octahedra, w here Cu-O-NO3-= 2.517(7) Angstrom (average). The compound has a chain structure; the chains stretching along [001] are packed pairwise accor ding to the hexagonal law.