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Crystals of [Al(C 5 H 5 N) 4 Cl 2 ][AlCl 4 ] are orthorhombic, Pna2 1 , Z = 4, a = 18.522(7), b = 15.141(5), c = 9.593(3) Å, V = 2690(2) Å 3  , D c  = 1.440 g/cm 3  . The structure has been solved from 5968 diffractometer measured intensities and refined by full-matrix least squares to R w (F) = 0.032. The crystal structure shows the complex to be trans-dichloro-tetrakis(pyridine)aluminium(III) tetrachloroaluminat(III). The mean trans Al-Cl-and trans Al-N-distances in the octahedron are 2.279(3) and 2.070(4) Å, respectively. Crystals of Al(C 5 H 5 N) 3 Cl 3  are monoclinic, P2 1 /c, Z = 4, a = 7.261(2), b = 29.961(4), c = 8.624(1) Å, β = 98.12(2)°, V -1857(1) Å 3  , D C  = 1.326 g/cm 3  . The structure has been solved from 4707 diffractometer measured intensities and refined to R w (F) = 0.028. The crystal structure shows octahedral complexes AlCl 3 ·3 (C 5 H 5 N) with trans geometry. The Al-N-distance trans to chlorine (2.096(2) Å) is significantly longer than the two other Al-N-distances (mean 2.072(2) Å).

zeitschrift für naturforschung b

Röntgenstrukturbestimmung von AlCl 3 -Pyridin-Addukten: Der strukturelle Aufbau im trans-Dichlorotetrakis(pyridin)aluminium(III)- Tetrachloroaluminat(III) und im Trichlorotris(pyridin)aluminium(III) / X-ray Diffraction Study of AICl 3 -Pyridine Adducts: The Crystal Structure of trans-Dichlorotetrakis(pyridine)aluminium(III)tetrachloroaluminat(III) and of Trichlorotris(pyridine)aluminium(III)