The Crystal Structure of Tris(l-propylenediamine)cobalt(III) Bromide and the Absolute Configuration of the Complex Ion, [Co l-pn3]3+
- 1 January 1966
- journal article
- research article
- Published by Oxford University Press (OUP) in Bulletin of the Chemical Society of Japan
- Vol. 39 (1) , 92-100
- https://doi.org/10.1246/bcsj.39.92
Abstract
Crystals of L-[Co l-pn3]Br3 (pn: propylenediamine) were prepared and their crystal structure was completely determined by means of X-rays. They are hexagonal, with the space group P63; a=11.08±0.03,c=8.59±0.02Å and Z=2. The structure is essentially ionic, consisting of complex ions and bromide anions. A complex ion has a three-fold axis of symmetry through the central cobalt atom. Five-membered Co-pn rings are puckered, and the C–C bonds in these rings are nearly parallel to the threefold axis. The methyl carbon bonds are equatorial with respect to the plane of the ring. The absolute configuration of the complex ion has been determined by using the absorption-edge technique. The Llll-type complex ion has been found to be laevorotatory with respect to the NaD lines. By the introduction of an asymmetric carbon atom into the ligands, the absolute configuration of a series of tris(bidentate)-complexes could be successfully correlated to the configurational series in organic compounds.Keywords
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