Bis{μ-4,4′,6,6′-tetra-tert-butyl-2,2′-[N-(2-oxidoeth­yl)imino­dimethyl­ene]diphenolato}dialuminium(III)

Hemmingson, S.L.; Stevens, A.J.; Tanski, J.M.; Getzler, Y.D.Y.L.

doi:10.1107/S1600536810027212

Volume 66
Part 8
Page m937
August 2010

Received 22 June 2010
Accepted 8 July 2010
Online 17 July 2010

Key indicators
Single-crystal X-ray study
T = 125 K
Mean (C-C) = 0.002 Å
R = 0.048
wR = 0.124
Data-to-parameter ratio = 24.5
Details

Bis{-4,4',6,6'-tetra-tert-butyl-2,2'-[N-(2-oxidoethyl)iminodimethylene]diphenolato}dialuminium(III)

Stephanie L. Hemmingson,^a Alice J. Stevens,^a Joseph M. Tanski ^b and Yutan D. Y. L. Getzler ^a ^*

^aDepartments of Chemistry & Biochemistry, Kenyon College, Gambier, OH 43214-9623, USA, and ^bDepartment of Chemistry, Vassar College, 124 Raymond Ave., Box 406, Poughkeepsie, NY 12604-0744, USA
Correspondence e-mail: getzlery@kenyon.edu

The title compound, [Al₂(C₃₂H₄₈NO₃)₂], exists as a dimer with bridging ethoxide groups. It was isolated from a reaction mixture of the parent ligand and trimethylaluminium in tetrahydrofuran. The geometry around the Al^III atom is a slightly distorted trigonal-bipyramid, typical of atrane derivatives.

Related literature

For background to atranes, see: Voronkov & Baryshok (1982). For recent alumatrane work, see: Su et al. (2006) and references therein. For related structures and their activity in lactide polymerization, see: Johnson et al. (2009).

Experimental

Crystal data

[Al₂(C₃₂H₄₈NO₃)₂]
M_r = 1043.39
Monoclinic, P 2₁ /n
a = 13.385 (2) Å
b = 16.352 (3) Å
c = 14.141 (2) Å
= 90.063 (2)°
V = 3095.1 (8) Å³
Z = 2
Mo K radiation
= 0.10 mm^-1
T = 125 K
0.26 × 0.16 × 0.09 mm

Data collection

Bruker APEXII CCD diffractometer
Absorption correction: multi-scan (SADABS; Bruker, 1999) T_min = 0.975, T_max = 0.991
42614 measured reflections
8485 independent reflections
5258 reflections with I > 2(I)
R_int = 0.076

Refinement

R[F² > 2(F²)] = 0.048
wR(F²) = 0.124
S = 1.02
8485 reflections
346 parameters
H-atom parameters constrained
_max = 0.28 e Å^-3
_min = -0.30 e Å^-3

Data collection: APEX2 (Bruker, 2007); cell refinement: SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: Mercury (Macrae et al., 2008); software used to prepare material for publication: enCIFer (Allen et al., 2004).

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: PK2252 ).

Acknowledgements

This work was generously supported by Kenyon College Startup Funds, Kenyon College Summer Science Scholars Program (SLH), the American Chemical Society's Petroleum Research Fund (42880-GB 7) (YDYLG) and the National Science Foundation (CHE-0521237) (JMT).

References

Allen, F. H., Johnson, O., Shields, G. P., Smith, B. R. & Towler, M. (2004). J. Appl. Cryst. 37, 335-338.
Bruker (1999). SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.
Bruker (2007). APEX2 and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA.
Johnson, A. L., Davidson, M. G., Pérez, Y., Jones, M. D., Merle, N., Raithby, P. R. & Richards, S. P. (2009). Dalton Trans. pp. 5551-5558.
Macrae, C. F., Bruno, I. J., Chisholm, J. A., Edgington, P. R., McCabe, P., Pidcock, E., Rodriguez-Monge, L., Taylor, R., van de Streek, J. & Wood, P. A. (2008). J. Appl. Cryst. 41, 466-470.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.
Su, W., Kim, Y., Ellern, A., Guzei, I. A. & Verkade, J. G. (2006). J. Am. Chem. Soc. 128, 13727-13735.
Voronkov, M. G. & Baryshok, V. P. (1982). J. Organomet. Chem. 239, 199-249.

metal-organic compounds