Facile synthesis of alkaline-earth-metal β-diketonates and the structure of the loose dimer [{Ca(hfpd)2}2(heptaglyme)] [hfpd = F3CCOCHCOCF3 and heptaglyme = Me(OCH2CH2)7 OMe)]
Abstract
The reaction of the Group 2 metal hydroxides, oxides or carbonates in
95% ethanol in the presence of a suitable glyme ligand L–L
[i.e.
Me(OCH
2
CH
2
)
n
OMe,
n = 3, 4 or 7] and a β-diketone, has yielded
either [M(β-diket)
2
(L–L)] or
[{M(β-diket)
2
}
2
(L–L)]
[M = Mg–Ba; β-diket = Htmhd
(2,2,6,6-tetramethylheptane-3,5-dione), Hhfpd
(1,1,1,5,5,5-hexafluoropentane-2,4-dione), Hdppd
(1,3-diphenylpropane-1,3-dione) or Hfod
(1,1,1,2,2,3,3-heptafluoro-7,7-dimethyloctane-4,6-dione,
L–L = tri-, tetra- or hepta-glyme)]. The crystal
structure of the complex
[{Ca(hfpd)
2
}
2
(heptaglyme)] has been
determined, revealing it to contain two Ca(hfpd)
2
units
linked by a glyme ligand in an unusual symmetrical bridging/chelating
mode.
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