The oxidation of [{Cu(dmcpz)}n](Hdmcpz = 3,5-dimethoxycarbonylpyrazole) with dioxygen in pyridine (py) leads to the formation of the violet complex [Cu(dmcpz)2(py)2]1. Crystals of 1 are monoclinic, space group P21/n(no. 14), a= 11.441(2), b= 9.339(3), c= 12.493(3)Å, β= 99.95(1)°, Z= 2; R= 0.033 for 2308 reflections having I > 3σ(I). Pyridine abstraction from 1via azeotropic distillation with benzene allows the isolation of the blue trinuclear linear complex [Cu3(dmcpz)6]2. Crystals of 2 are monoclinic, space group P21/c(no. 14), a= 17.286(3), b= 20.649(4), c= 16.498(2)Å, β= 114.51(1)°, Z= 4; R= 0.034 for 4710 reflections having I > 3σ(I). Rapid equilibria between 1, 2 and a still uncharacterized species 3 have been verified to occur in solution. A CH2Cl2 solution of 1 is violet below –10 °C, deep blue at around 15 °C and green at temperatures higher than 35 °C; it has been confirmed that these colours are associated with the presence of the distinct species 1, 2 and 3. The chemical, spectroscopic and structural properties of 1 and 2 are discussed.

Co-ordinative versatility of the dmcpz ligand (Hdmcpz = 3,5-dimethoxycarbonylpyrazole) in copper compounds. Synthesis, characterization and crystal structures of [Cu(dmcpz)2(py)2] and [Cu3(dmcpz)6](py = pyridine) / M. Angaroni, G.A. Ardizzoia, G. La Monica, E.M. Beccalli, N. Masciocchi, M. Moret. - In: JOURNAL OF THE CHEMICAL SOCIETY DALTON TRANSACTIONS. - ISSN 0300-9246. - :18(1992), pp. 2715-2721.

Co-ordinative versatility of the dmcpz ligand (Hdmcpz = 3,5-dimethoxycarbonylpyrazole) in copper compounds. Synthesis, characterization and crystal structures of [Cu(dmcpz)2(py)2] and [Cu3(dmcpz)6](py = pyridine)

E.M. Beccalli;
1992

Abstract

The oxidation of [{Cu(dmcpz)}n](Hdmcpz = 3,5-dimethoxycarbonylpyrazole) with dioxygen in pyridine (py) leads to the formation of the violet complex [Cu(dmcpz)2(py)2]1. Crystals of 1 are monoclinic, space group P21/n(no. 14), a= 11.441(2), b= 9.339(3), c= 12.493(3)Å, β= 99.95(1)°, Z= 2; R= 0.033 for 2308 reflections having I > 3σ(I). Pyridine abstraction from 1via azeotropic distillation with benzene allows the isolation of the blue trinuclear linear complex [Cu3(dmcpz)6]2. Crystals of 2 are monoclinic, space group P21/c(no. 14), a= 17.286(3), b= 20.649(4), c= 16.498(2)Å, β= 114.51(1)°, Z= 4; R= 0.034 for 4710 reflections having I > 3σ(I). Rapid equilibria between 1, 2 and a still uncharacterized species 3 have been verified to occur in solution. A CH2Cl2 solution of 1 is violet below –10 °C, deep blue at around 15 °C and green at temperatures higher than 35 °C; it has been confirmed that these colours are associated with the presence of the distinct species 1, 2 and 3. The chemical, spectroscopic and structural properties of 1 and 2 are discussed.
Settore CHIM/06 - Chimica Organica
Settore CHIM/03 - Chimica Generale e Inorganica
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/188542
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