Mixed-Ligand Complexes : Part V. Cobalt (III) Heterochelates with Ethylenedibiguanide

A series of Cobaltic heterochelates have been prepared by the action of O-phenanthroline, \(\propto\) \(\propto\)'-dipyridyl, biguanide or glycine on diamine ethylene-dibiguanide Cobalt(III) hydroxide sulphate. The complexes are all quite soluble and have been characterised by conductance and equivalent weight measurements. The electronic absorption spectra reveal two ligand field bands representing the transitions  

                                                                      1                  1    and    1                1        . The

                                                                         A   \(---\rightarrow\) T             A  \(---\rightarrow\)  T

                                                                             1g                 1g            1g               2g     

ligand obey their expected position in the spectrochemical series.