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Large single crystals of optical quality of (±)-tris(ethylenediamine)cobalt(III) nitrate have been grown from aequeous solutions. An X-ray structure analysis yielded space group  Pca 2 1 ,  a  1  = 15.441(3) Å,  a  2  = 8.607(2) Å,  a  3  = 12.328(2) Å,  Z  = 4,  ϱ  calc  = 1.724 g cm −3 ,  ϱ  obs  = 1.730 g cm −3 . The structure is built up from [Co(H 2 N(CH 2 ) 2 NH 2 )] 3+  cations and nitrate anions which are linked by Coulomb interactions and by a three-dimensional network of hydrogen bonds. Two ligands of the cationic chelate complex are disordered. Its probable conformation is  Δδλλ  or the enantiomorphic  Λδδλ .

zeitschrift für kristallographie - crystalline materials

Crystal structure, dielectric, piezoelectric and elastic properties of (±)-tris(ethylenediamine)cobalt(III) nitrate, (±)–[Co(H 2 N(CH 2 ) 2 NH 2 ) 3 ](NO 3 ) 3