page_title: Cis-Dichlorobis(ethylenediamine)cobalt(III) chloride
section_title: Synthesis and optical resolution
hierarchical_section_title: Cis-Dichlorobis(ethylenediamine)cobalt(III) chloride / Synthesis and optical resolution
caption_attribution_description: English: Ultraviolet-visible spectroscopy of isomerisation kinetics from trans-Dichlorobis(ethylenediamine)cobalt(III) chloride to cis-Dichlorobis(ethylenediamine)cobalt(III) chloride in Methanol, T=50°C. The top (red) one is for cis- and the bottom (denser) ones are for trans- isomer. Measured at University of Graz. Slovenčina: UV/VIS Spektroskopia kinetiky izomerizácie chloridu trans-dichlóro-bis(etyléndiamín)-kobaltitého na chlorid cis-dichlóro-bis(etyléndiamín)-kobaltitý v metanole, T=50°C. Merané na Univerzite Graz.
context_page_description: cis-Dichlorobis(ethylenediamine)cobalt(III) chloride is a salt with the formula [CoCl₂₂]Cl. The salt consists of a cationic coordination complex and a chloride anion. It is a violet diamagnetic solid that is soluble in water. One chloride ion in this salt readily undergoes ion exchange, but the two other chlorides are less reactive, being bound to the metal center.
context_section_description: Cis-dichlorobis(ethylenediamine)cobalt(III) chloride is obtained by heating a solution of trans-dichlorobis(ethylenediamine)cobalt(III) chloride, e.g. using a steam bath.
  The racemate can be resolved into two enantiomers (Λ and Δ) by the formation of the d-α-bromocamphor-π-sulfonate salt. The diastereomeric salts are separated by recrystallization.  After their purification, the individual diastereomers are converted back to the chloride salt by reaction with ice cold hydrochloric acid.
caption: UV-vis spectra of various stages in the conversion of trans-[CoCl2(en)2]+ to the cis isomer.
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