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4 páginas, 4 figuras, 3 tablas.The crystal structure of the complex catena-bis(u-6-amino-3-methyl-5-nitrosouraci1ato-N5 ,O4, N1, O2)cadmium(II) has been determined.\udIt crystallizes in the tetragonal space group P41212-D44 with cell dimensions a = b = 7.885 (0) A, c = 26.359 (2) A,\udV = 1638.8 (1) A3, and Z = 4. The structure was solved from diffractometer data by Patterson and Fourier methods and refined\udby full-matrix least squares to R = 0.018 for 1956 data. The structure consists of a sequence of complex polyrneric sheets, linked\udby hydrogen bonds. Each ligand is coordinated to two different cadmium atoms, and each cadmium atom is coordinated by four\udpyrimidine ligands. These ligands are equivalent with one cadmium atom binding through N5 and 04 atoms, while the other\udcadmium atom binds through the N1 and 02 sites. The cadmium atom is eight-coordinated and shows a C2 symmetry that can\udbe described as a dodecahedron with the mmmm arrangement of ligands. The A vertices are al1 occupied by oxygen atoms and\udthe B vertices by nitrogen atoms.Peer reviewe

inorganic chemistry

A novel type of tetradentate uracil derivative in a dodecahedral eight-coordinate chelate complex: catena-bis(.mu.-6-amino-3-methyl-5-nitrosouracilato-N5,O4,N1,O2)cadmium(II)