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The compound Co(acac) 2 (NO) (1) crystallizes in the triclinic space group P1̄ with lattice constants« - 806.4(2), b = 1095.3(7), c - 776.4(3) pm, α = 105.62(4), β = 113.18(2), γ = 75.14(3)°, Z - 2. The Co atom exhibits a square pyramidal coordination with the chelating acac ligands in the basis and the NO group at the apex, the angle Co - N - O being 120.4°. 1 is very sensitive to oxygen and, with air in aqueous acetone, yields Co(acac) 2 (NO 2 )(H 2 O) (2). 2 crystallizes in the monoclinic space group P2 1 /n with lattice constants a = 704.9(9), b = 1314.2(7). c - 1451.3(7) pm. β = 97.93(2)°, Z = 4. The structure of 2 is built up by octahedral complexes with the aquo and the nitro ligand in trans positions. A CH 2 Cl 2  solution containing 1 and Co(acac) 2  reacts with O 2 , to form CO 5 (acac) 8 (μ-OH ) 2 (μ - N, O -NO;)2 (3) which precipitates on cooling to - 30°C and addition of hexane. 3 crystallizes in the monoclinic space group P2/n with a = 2227(1), b = 1128.9(7), c = 2293(2) pm, β = 104.79(3)°, Z - 4. The structure consists of pentanuclear complexes with C 2  symmetry. Two Cortriangles sharing one corner are each bridged by one μ 3  - OH -group. The NO 2  ligand functions as a N,O-bonded bridging group. The acac ligands complete the coordination of the Co-atoms to distorted octahedra.

zeitschrift für naturforschung b

Nitrosyl- und Nitrokomplexe des Cobalts, 1. Mitteilung Kristallstruktur von Co(acac) 2 (NO) und seinen Oxidationsprodukten Co(acac) 2 (NO 2 )(H 2 O) und Co 5 (acac) 8 (μ 3 -OH) 2 (μ-N ,O–NO 2 ) 2 / Nitrosyl and Nitro Complexes of Cobalt, Part 1 Crystal Structure of Co(acac) 2 (NO) and its Oxidation Products Co(acac) 2 (NO 2 )(H:O) and Co 5 (acac) 8 (μ 3 -OH) 2 Cu- N,O-NO 2 ) 2