Praseo complex

Luteo complex Purpnreo complex Praseo complex Video complex... 

Porterfield. W. W., 295 Positive oxidation states, halogens in, 837-848 Posttransition metals, 28. 876 Potassium, 309, 582-587 Potentials, electrode, 378-383 Pourbaix diagram, 591-592 Praseo complex, 388,491, 493 Predominance area diagram, 591 Prewitt, C. T., 116-117 Principal axis, 51 Prism, trigonal prism, 489-491 Probability function, 13 Prosthetic group, 919 Proteins, and blue copper proteins, 912-916 Proton... 

Fig. 12.18 Examples of cis and irons octahedral isomers (a) cis-tetraamminedichlorocoball(Iil). Werner s video complex, and (b) irons-tetraamminedichlorocobalKIN), Werner s praseo complex.

Liiieo complex Purpureo complex Praseo complex Violeo complex... 

CoC13 4NH3 Green Praseo complex iran.s-[Co(NII3)4CI2 CI... 

CoC13 4NH3 Green Praseo complex [Co(NH3)4C12]C1... 

It should be noted that until Werner s time, complexes were usually designated by names denoting color luteo for yellow, purpitreo for purple-red and roseo for pink. Some compds were called praseo to designate their green color... 

Reaction 11.3 occurs for both the praseo and vtolev complexes. 

In their first publication on this subject,59 Werner and Miolati showed that the molecular conductances (fx) of coordination compounds decreased as successive molecules of ammonia were replaced by acid residues (negative groups or anions). For cobalt(III) salts, they found that fi for luteo salts (hexaammines) > fi for purpureo salts (acidopentaammines) > /t for praseo salts (di-acidotetraammines). The conductance fell almost to zero for the triacidotriammine Co(N02)3-(NH3)3 and then rose again for tetracidodiammines, in which the complex behaved as an anion. By such measurements, Werner and Miolati determined the number of ions in complexes of cobalt(III), platinum(II) and platinum(IV). They not only found support for the coordination theory, but they also elucidated the process of dissociation of salts in aqueous solution and followed the progress of aquations. 

There are two simple types of geometric isomerism possible for octahedral complexes. The first exists for complexes of the type MA2B4 in which the A ligands may be either next to each other (Fig. 12.18a) or on opposite apexes of the octahedron (Fig. 12.18b). Complexes of this type were studied by Werner, who showed that the praseo and violeo complexes of tetraamminedichlorocobalt(in) were of this type (see Chapter 11). A very large number of these complexes is known, and classically they provided a fertile area for the study of structural effects. More recently there has been renewed interest in them as indicators of the effects of lowered symmetry on electronic transition spectra. 

Complexes B Complexes of this type were studied 1 Werner, who showed that the praseo and... 

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