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

Abstract

Alfred Werner's historic resolution of Δ/Λ-[Co(en) 3 ] 3+ (where en = ethylenediamine) provided conclusive evidence for octahedral geometry coordination compounds and the first example of chirality in an inorganic molecule. Herein, we report the historically significant structure and absolute configuration of Δ-(-) 589 -tris(ethylenediamine) cobalt(III) iodide monohydrate, * Dr. J. P. Lee E-Mail: John-Lee@utc.edu [a]

Synthesis and structure determination of racemic (Δ/Λ)-tris(ethylenediamine)cobalt(III) trichloride hemi(hexaaquasodium chloride)

“…The structure of the bromide salt of the Á-enantiomer, Á-[Co(en) 3 ]Br 3 ÁH 2 O, was carried out in 1962, though the absolute structure could not be determined by anomalous dispersion at that time (Nakatsu, 1962). The structure of the right-handed helical enantiomer, Á-[Co(en) 3 ]I 3 ÁH 2 O was finally reported in 2019 and crystallizes in the orthorhombic space group P2 1 2 1 2 1 (Grant et al, 2019).…”