Abstract
An X-ray analysis has been made of the crystalline complex between trimethylplatinum and 4:6-dioxononane, empirical formula (CH
3
)
3
Pt(C
3
H
7
CO. CH CO C
3
H
7
). There are two centrosymmetrical dimeric molecules in a monoclinic unit cell having
a
= 14.71,
b
= 10.55,
c
= 9.15 Å, β = 102.8°, space group
P
2
1
/
a
. The atomic positions have been determined by three-dimensional analysis and refined by the method of least squares. The final value of the residual
R
was 0.076. Each platinum in the binuclear complex is octahedrally co-ordinated to three methyl groups in
cis
configuration (Pt—C = 2.02 + 0.02 Å), to two oxygens of one β-diketone (Pt—O = 2.15 + 0.01 Å) and to the central carbon atom (the ‘active methylene’) of the other diketone (Pt—C = 2.39 + 0.03 Å). This and the similar compound reported in part II, provide the first examples of β-diketones acting as bridges in polynuclear complexes and of β-diketones acting as tridentate groups. Preliminary crystallographic data for trimethylplatinic acetylacetonate have also been obtained.
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