Structure Data of Free Polyatomic Molecules
946
ED
C22H38O4Sr
rg
Sr–O
C–C(r)
C–C(t)
C(t)–C(m)
C(m)–H
C(r)–H
O–C
Bis(2,2,6,6-tetramethyl-3,5D2d (without methyl groups)
heptanedionato-κO,κO')strontium
Bis(dipivaloylmethanato-κO,κO')strontium
Å a)
2.399(6)
1.427(4)
1.542(3)
1.562(10)
1.128(6)
1.115 b)
1.287(6)
θα
O–Sr–O
O–C–C(t)
C–C(r)–C
C–C(t)–C(m)
C(t)–C(m)–H
τ 1 c)
ϕ d)
τ 2 e)
deg a)
71.0(10)
116.0(19)
122.1(15)
109.1(18)
110.4(17)
0.0(40)
0.0(50)
24.1(33)
H 3C
H 3C
CH3
H 3C
O O
Sr
O O
H 3C
H 3C
CH3
H 3C
It was assumed that only one molecular form
was present in the overheated vapor.
The nozzle temperature was 437(5) °C.
a
) 2.5 times the estimated standard
errors including a systematic error.
b
) Assumed.
c
) Angle of the ligand rotation about the
Sr…C(r) axis; τ1 = 0° when the ligand planes
are perpendicular to each other (D2d symmetry).
d
) Angle of ligand folding along the O…O line, i.e., angle between the OSrO
and OCC(r)CO planes.
e
) C(m)–C(t)–C–O torsional angle; τ2 = 0° for the syn position.
Giricheva, N.I., Girichev, G.V., Belova, N.V., Isakova, N.A., Kuzmina, N.P.: Zh. Strukt.
Khim. 40 No.6 (1999) 1067; J. Struct. Chem. (Engl. Transl.) 40 (1999) 862.
Landolt-Börnstein
New Series II/28D
CH3
CH3
CH3
CH3