Acta Crystallographica Section C

Crystal Structure Communications

Volume 69, Part 10 (October 2013)

metal-organic compounds

ky3026 scheme

Acta Cryst. (2013). C69, 1120-1123    [ doi:10.1107/S0108270113023135 ]

Aluminium(III) amidinates formed from reactions of `AlCl' with lithium amidinates

D. H. Mayo, Y. Peng, P. Zavalij, K. H. Bowen and B. W. Eichhorn

Abstract: The disproportionation of AlCl(THF)n (THF is tetrahydrofuran) in the presence of lithium amidinate species gives aluminium(III) amidinate complexes with partial or full chloride substitution. Three aluminium amidinate complexes formed during the reaction between aluminium monochloride and lithium amidinates are presented. The homoleptic complex tris(N,N'-diisopropylbenzimidamido)aluminium(III), [Al(C13H19N2)3] or Al{PhC[N(i-Pr)]2}3, (I), crystallizes from the same solution as the heteroleptic complex chloridobis(N,N'-diisopropylbenzimidamido)aluminium(III), [Al(C13H19N2)2Cl] or Al{PhC[N(i-Pr)]2}2Cl, (II). Both have two crystallographically independent molecules per asymmetric unit (Z' = 2) and (I) shows disorder in four of its N(i-Pr) groups. Changing the ligand substituent to the bulkier cyclohexyl allows the isolation of the partial THF solvate chloridobis(N,N'-dicyclohexylbenzimidamido)aluminium(III) tetrahydrofuran 0.675-solvate, [Al(C19H27N2)2Cl]·0.675C4H8O or Al[PhC(NCy)2]2Cl·0.675THF, (III). Despite having a twofold rotation axis running through its Al and Cl atoms, (III) has a similar molecular structure to that of (II).

Formula: [Al(C13H19N2)3], [Al(C13H19N2)2Cl] and [Al(C19H27N2)2Cl]·0.675C4H8O

Keywords: crystal structure; aluminium(III) amidinates; disorder.

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Structure factor file (CIF format) (807.6 kbytes)
[ doi:10.1107/S0108270113023135/ky3026AlPhCNiPr23sup2.hkl ]
Contains datablock AlPhCNiPr23

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Structure factor file (CIF format) (582.7 kbytes)
[ doi:10.1107/S0108270113023135/ky3026AlPhCNiPr22Clsup3.hkl ]
Contains datablock AlPhCNiPr22Cl

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Structure factor file (CIF format) (221.6 kbytes)
[ doi:10.1107/S0108270113023135/ky3026AlPhCNCy22Clsup4.hkl ]
Contains datablock AlPhCNCy22Cl


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