Cobalt, tris structure

Cobalt, trichlorotris(l,2-ethylenediamine)-conformation, 1, 197 Cobalt, (triethylcnetetramine)-isomerism, 1, 200,201 Cobalt, trinitrato-structure, 1,67 Cobalt, tris(acetylacetone)-structure, 1, 62,65,67 Cobalt, tris(bipyridyl)-structure, 1,64... 

Cobalt, tris(l,2-ethanediamine)-conformation, 1,25,197 polarography, 1,481 racemization, 1, 466 solid state, 1,466,467 reactions, 1, 27 redox potential, 1, 514 structure, 1, 67... 

Cobalt, tris(oxalato)-racemization solid state, 1, 467 structure, 1, 68... 

Cobalt, tris(l,2-propanediamine)-complexes structure, 1, 25 conformation, 1,25 nomenclature, 1, 129 stereonotation, 1,129... 

Cobalt, tris(acetylacetone)-structure, 62, 65, 67 Cobalt, tris(bipyridyl)-structurc, 64... 

Iron(II) complex of tris(N -tert-butylurea-ylato)-N-ethylene]aminato activates dioxygen at room temperature to afford an iron(III) complex containing a single terminal oxo ligand. X-ray structures show that the three urea molecules act as a tridentate N,N,N-hgand [52]. The tripodal ligand was also used to synthesise complexes of cobalt, iron or zinc with terminal hydroxo ligands (Scheme 8) [53]. 

With sp bond angles calculated to be around 162°, macrocycle 131 would be highly strained and was therefore expected to be quite reactive [79]. The octa-cobalt complex 132, on the other hand, should be readily isolable. Indeed, 132 was prepared easily from 133 in five steps, and was isolated as stable, deep maroon crystals (Scheme 30). All spectroscopic data supported formation of the strain-free dimeric structure. Unfortunately, all attempts to liberate 132 from the cobalt units led only to insoluble materials. Diederich et al. observed similar problems when trying to prepare the cyclocarbons [5c]. Whether the failure to prepare these two classes of macrocycles is due to the extreme reactivity of the distorted polyyne moiety or to the lack of a viable synthetic route is not certain. Thus, isolation and characterization of smaller bent hexatriyne- and octatetrayne-containing systems is an important goal that should help answer these questions. 

Finally, the tris(pyrazolyl)hydroborato ligand system has also provided an interesting example in which a crystallographic site is disordered between a vacancy and a chain of three atoms. Thus, the x-ray structure of the cobalt complex [TpAnt]CoNCS (Ant = 9-anthryl) revealed the presence of the cocrystallized thallium derivative... 

When electrochemical oxidation of Co metal is carried out in an acetonitrile solution of phosphinothiol ligands, tris(phosphinothiolate)cobalt(III) compounds are formed.1039 The octahedral P,S-chelated Co(2-(Ph2P)-6-(Me3Si)C6H3S)3 compound has been characterized structurally. 

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