This experiment utilizes cylinder-shaped filter paper, capillary pipets for spotting, the dipping or rolling method of applying the reagents, and the use of multiple dipping.
Isomerization and substitution reactions of cis-Co(en)2Cl2+ (en = ethylenediamine) have been investigated in solvent water and solvent methanol.2 In aqueous solution the cis-trans isomerization is complicated by competition between chloride ion and water for the cobalt ion. However, in solvent methanol cis-[Co(en)2Cl2]Cl has been shown3-5 to isomerize quantitatively to the iraros-isomer at 36°b y a first-order reaction without net loss of ligand chloride. Trimble6 found no spectrophotometric evidence for any change of the irans-complex in methanol in 12 hours at 100°. He observed that the m-complex in 2-methoxyethanol ("Methyl Cellosolve") isomerizes completely at 30-50°, followed by a slower reaction between solvent and trans-isomer. Brasted and Hirayama7 8studied the isomerization in ethanol and propanol as well as in methanol.Miss Mary E. Burke, who took data during some of the night rate work, is gratefully acknowledged.
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