The crystal structures of two aluminium chloro-propoxides
Abstract
The attempt to synthesize an oligomer of aluminium dichloro-iso-propoxide · iso-propanol led to crystals of two interesting compounds: trialuminium pentachloro-tetra-iso-propoxide · iso-propanol, Al3Cl5(O-i-Pr)4 · i-PrOH (1), and trialuminium hexachloro-oxo-iso-propoxide · 3 iso-propanol, Al3Cl6O(O-i-Pr) · 3 i-PrOH (2). Both of them crystallize with the monoclinic space group P21/n. The lattice parameters of 1 area a = 10.1863(7) Å, b = 28.276(2) Å, c = 18.8681(12) Å, β = 93.512(1)°, Z = 8; the data of 2 are a = 11.300(2) Å, b = 14.920(2) Å, c = 15.816(2) Å, β = 97.14(3)°, Z = 4.
In 1, as well as in 2, two of the aluminium atoms are tetrahedrally coordinated, while the other displays octahedral coordination. Compound 1 is closely related to Al3Cl5(O-i-Pr)4 (3), which was previously published in 1978 [1].
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