Nickel(II) complexes of some 3-substituted Pentane-2,4-diones

Graddon, DP; Heng, KB

doi:10.1071/ch9722247

Cited by 14 publications

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“…In addition, we have used the same method to prepare the derivatives in which R = Me ( 9 ), Ph ( 10 ), and C 2 H 4 Ph ( 11 ). 9 and 10 , are known compounds and have been suggested to be in equilibrium in solution with a trimeric structure related to 1 while UV evidence has been presented which indicates that monomers are formed upon vaporization of the trimers 3d…”

Section: Resultsmentioning

confidence: 99%

Monomer−Trimer Isomerism in 3-Substituted Pentane-2,4-dione Derivatives of Nickel(II)

et al. 1997

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Bis(η3-allyl)nickel reacts with pentane-2,4-dione derivatives having alkenyl substituents in the 3-position to give Ni(3-R-pentane-2,4-dionato)2 compounds which have been shown by X-ray diffraction and NMR spectroscopy to be monomeric [R = 5-hexenyl, C22H34NiO4, a = 13.718(3) Å, b = 4.962(1) Å, c = 16.643(3) Å, β = 92.46(3)°, space group P21/n, Z = 2; R = 7-octenyl, C26H42NiO4, a = 4.8449(5) Å, b = 8.3202(8) Å, c = 16.792(1) Å, α = 89.480(4)°, β = 88.240(4)°, γ = 77.30(1)°; R = 9-decenyl, C30H50NiO4, a = 4.8067(2) Å, b = 8.2809(3) Å, c = 19.4014(7) Å, α = 90.974(4)°, β = 91.907(4)°, γ = 102.495(4)°, space group P1̄, Z = 1; R = methyl, C12H18NiO4, a = 4.9447(4) Å, b = 8.0649(7) Å, c = 9.0633(6) Å, α = 109.377(6)°, β = 93.706(7)°, γ = 106.283(7)°, space group P1̄, Z = 1; R = phenylethano, C26H30NiO4, a = 12.792(1) Å, b = 6.503(1) Å, c = 14.933(1) Å, β = 109.025(7)°, space group P21/n, Z = 2] in the crystal and in solution at room temperature. No inter- or intramolecular interaction of the alkenyl substituent with the 16e metal atom is observed. The corresponding Ni compounds containing the 3-phenyl-substituted dione have been shown to adopt both monomeric [C22H22NiO4, a = 10.2261(5) Å, b = 6.6439(3) Å, c = 13.7862(7) Å, β = 93.677(6)°, space group P21/n, Z = 2] and trimeric [(C22H22NiO4)3, a = 10.5917(7) Å, b = 12.3092(8) Å, c = 12.5926(5) Å, α = 103.937(4)°, β = 96.388(3)°, γ = 96.227(5)°, space group P1̄, Z = 1] forms in the crystal while the compound formed by tert-butyl acetoacetate [(C16H26NiO6)3, a = 9.713(1) Å, b = 17.550(1) Å, c = 17.391(1) Å, β = 100.272(5)°, space group P21/n, Z = 2] is a trimer in which the central Ni atom interacts solely with bridging acetyl groups. The crystal structure of 3-phenyl-2,4-pentanedione [C11H12O2, a = 19.2961(6) Å, b = 6.8561(2) Å, c = 7.5935(2) Å, space group Pnma, Z = 4] has also been determined.

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