Complexes Exhibiting Marked Splitting in the Second Absorption Bands

2 Complexes Exhibiting Marked Splitting in the Second Absorption Bands 

In 1958, Yamatera studied shifting and splitting of the first and the second absorption band due to substitution of ligands. Thus, he supported that a broad and unsymmetrical ab rption band observed in the spectrum of an a-isomer is 

Carbonatoethylenediamineglycinatocobalt(III), [CoCCOaXglyXen)], also having a C0N3O3 chromophore, was prepared by air oxidation from the components, then converted to [CoCl(gly)(en)(H20)] by warming with cone. HCl, and finally treated with aqueous KHCO3 solution to obtain a violet and a red isomer. The solution spectra of the two isomers were characteristic for mer- and /ac-[CoN303] complexes. 

Prior to these works other reports dealt with complexes exhibiting a similar shoulder in the saond absorption band Jorgensen measur l the spectra of [Co(OHXedta)f and [Cr(OHXedta)f . For the latter complex, Furlani stated such effect to be due to a low symmetry caused by distortion of the octahedron. A similar sj trum was observed for [Co(OH)(penten)f 

Based on the working hypothesis on the [CoNjOsJ-type complexes, Nakashima and Shibata extended their preparative work to the [Co(CN)(C03)(Nj)]-type complexes, where (N)3 represents three NH3, one NH3 plus one en, or one ien. The possible geometrical isomers are illustrated in Fig. 5.2, where mer and fac refer to 

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