Crystal Structure and Absolute Configuration ofTartrate Derivatives. 2. [∧(δδδ)-Co(en)₃][(+)₅₈₉-(R,R)-tart^2-]Cl·5h₂O

A Missing Structural Link in the Werner Series of Cobalt(III) Complexes: The Crystal Structure of Δ‐(–)589‐Tris(ethylenediamine)cobalt(III) Iodide Monohydrate

“…The average chemically equivalent internal N–Co–N, external N–Co–N, and trans N–Co–N bond angles are 84.8(2), 91.9(2), and 174.4(2)°, respectively. From the internal N–Co–N bond angles, it can be seen that the CoN 6 core deviates slightly from octahedral arrangement, which has been stated previously to be a due to the compressed bite angle of the en ligands …”

“…A search of the Cambridge Crystallographic Database (CSD) shows that the racemic mixture of Δ/Λ‐[Co(en) 3 ] X 3 , where X = Cl or I, the diastereomer Λ‐(+)‐[Co(en) 3 ]( l ‐(+)‐ tartrate)Cl, and the single enantiomer Λ‐(+)‐[Co(en) 3 ]I 3 have each been characterized by single‐crystal X‐ray diffraction . The Δ enantiomer was first studied in 1962 using anomalous scattering of X‐rays of an enantiomorphous pair with bromide and 10 years later with nitrate serving as outer sphere anions, respectively, in two different coordination compounds .…”

The relation between crystal structure and solubility for the diastereoisomeric salts formed when enantiomers of bis(ethylenediamine)glycinatocobalt(III) are resolved with di-μ-[(R,R)-tartrato(4-)]-diantimonate(III)

“…The crystal structures of other diastereoisomeric salts have also been studied in order to obtain information of the chiral discrimination observed as a difference in solubility. The investigators of these systems have explained the chiral discrimination as a result of strong 'face to face' or close contacts between cation and anion (Okazaki, Sakaguchi & Yoneda, 1983;Magill, Korp & Bernal, 1981).…”