185054-07-3Relevant academic research and scientific papers
Monomer-Trimer Isomerism in 3-Substituted Pentane-2,4-dione Derivatives of Nickel(II)
D?hring,Goddard,Jolly,Krüger,Polyakov
, p. 177 - 183 (1997)
Bis(n3-allyl)nickel reacts with pentane-2,4-dione derivatives having alkenyl substituants 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) ?, b = 4.962(1) ?, c = 16.643(3) ?, β=92.46-(3)°. space group P21/n, Z = 2; R = 7-octenyl, C26H42NiO4, a = 4.8449(5) ?, b = 8.3202(8) ?, c = 16.792(1) ?, α = 89.480(4)°, β= 88.240(4)°, γ = 77.30(1)°; R = 9-decenyl, C30H50NiO4, a = 4.8067(2) ?, b = 8.2809(3) ?, c = 19.4014(7) ?, α = 90.974(4)°, β= 91.907(4)°, γ = 102.495(4)°, space group P1?, Z = 1; R = methyl, C12H18NiO4 a = 4.9447(4) ?, 6 = 8.0649(7) ?, c = 9.0633(6) ?, α = 109.377(6)°, β = 93.706(7)°, γ = 106.283(7)°, space group P1?, Z = 1; R = phenylethano, C26H30NiO4, a = 12.792(1) ?, b = 6.503(1) ?, c = 14.933(1) ?, 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 16c 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) ?, b = 6.6439(3) ?, c = 13.7862(7) ?, β= 93.677(6)°, space group P21/n, Z = 2] and trimeric [C22H22NiO4)3, a = 10.5917(7) ?, b = 12.3092(8) ?, c = 12.5926(5) ?, a = 103.937(4)°, β= 96.388(3)°, γ = 96.227(5)°, space group P1?, Z = 1] forms in the crystal while the compound formed by tert-butyl acetoacetate [(C16H26NiO6)3, a = 9.713(1) ?, b = 17.550(1) ?, c = 17.391(1) ?, 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) ?, b = 6.8561(2) ?, c = 7.5935(2) ?, space group Pnma, Z = 4] has also been determined.
