
TY  - JOUR
A1  - Taylor, D 
T1  - The crystal structures of potassium Tris(oxalato)-chromate(III) and -aluminate(III) trihydrate: A reinvestigation
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1978
VL  - 31
IS  - 7
SP  - 1455
EP  - 1462
KW  - 
UR  - https://doi.org/10.1071/CH9781455 
N2  - The crystal structures of the isomorphous complexes K3 [M(oxalate)3],3H2O, M = CrIII and AlIII, have been determined from three- dimensional diffractometer intensity data by conventional Patterson and difference Fourier techniques. The crystals are monoclinic; M = Cr, a 7.714(1), b 19.687(4), c 10.361(2) &#506;, &#946; 108.06(3)°; M = Al, a 7.712(1), b 19.518(3), c 10.286(2) &#506;, &#946; 108.21(3)°; space group P21/c with Z = 4. Block-diagonal least-squares refinement of all non-hydrogen atoms con- verged at R 0.040, Rw 0.051 (M = Cr); R 0.048, Rw 0.056 (M = Al). The structures are comprised of discrete M(ox)33- anions, K+ cations and water molecules. One potassium ion and one water molecule appear to be cooperatively disordered over two possible pair sites (&#945;, &#946;) with occupancy ratios &#945;/&#506; c. 3 : 1. The geometries within the M(ox)33- anions are as expected with <Cr-O> 1.969(13), <Al-O> 1.896(15) &#506;. The oxalate ligands are non-planar with <C-O(inner)> 1.284(6), 1.279(12); <C-O(outer)> 1.223(5), 1.223(10) and <C-C> 1.538(16), 1.534(21) &#506; for the two structures. 
ER  -

