Octahedral complexes high-spin

Distortion in d4 High Spin Octahedral Complex High spin octahedral complexes of d4 ion have any of the following configuration... 

Determine the ground-state electron configuration and spectral term of the following octahedral complexes low-spin Fe(CN)g- low-spin Cr(CO)6 high-spin Cr(H20)g+. 

Iron(III) complexes of tetradentate N4 macrocyclic ligands may be five-coordinate (square pyramidal) or six-coordinate (approximately octahedral), and high-spin (S = ), intermediate spin... 

Although relatively few iron(IV) compounds have been characterized, transient Fe O species appear to be involved in many natural oxidation systems, especially in porphyrin and related complexes57 (see above). Several low-spin /t-nitridodiiron complexes, [Fe—N—Fe]n+, are known for n = 5,658 and they are prepared as shown in Fig. 17-E-6. Mixed oxides containing FeIV have been noted. In an octahedral environment, high-spin iron(IV) oxides show the typical distortion of the Fe06 moiety due to the Jahn-Teller effect.59... 

As a consequence of these points, the spectra of octahedral Mn high-spin and of tetrahedral iron complexes consist of a number of bands of width 500 cm with e 0.1 lying at fairly high energies [those for Mn(H20)6 " commence at 18000 cm ] and whose positions are not very sensitive to the details of the ligands, Probably because the chemical species present are not well defined in solution, the spectra for octahedral Fe complexes are diffuse and rarely interpretable, Because a number of bands are present for the other cases, it may be possible to deduce several of the ligand field and interelectronic repulsion parameters and even X, although the uncertainty in Dq may be substantial. 

Tris(2,4-pentanedionato)iron(III) [14024-18-1], Fe(C H202)3 or Fe(acac)3, forms mby red rhombic crystals that melt at 184°C. This high spin complex is obtained by reaction of iron(III) hydroxide and excess ligand. It is only slightly soluble in water, but is soluble in alcohol, acetone, chloroform, or benzene. The stmcture has a near-octahedral arrangement of the six oxygen atoms. Related complexes can be formed with other P-diketones by either direct synthesis or exchange of the diketone into Fe(acac)3. The complex is used as a catalyst in oxidation and polymerization reactions. 

However, high spin (P and (P species, which possess 4, 5, and 4 unpaired electrons, respectively, are labile, as are (P through (P octahedral complexes. In addition to the inert (P systems, low spin (P and (P complexes are inert to rapid substitution. The (P species are the least labile of the configurations classed as labile. 

Aqueous solutions of salts with non-coordinating anions contain the pale-pink, [Mn(H20)6] +, ion which is one of a variety of high-spin octahedral complexes which have been... 

Derive the electron distribution of the Fe3+ ion in the low-spin and high-spin octahedral complexes. 

Explain why Mn34 forms high-spin and low-spin octahedral complexes but Mn44 does not... 

The nature of the transition between high spin and low spin octahedral complexes of the transition metals. R. L. Martin and A. H. White, Transition Met. Chem. (N.Y.), 1968,4,113-198 (115). 

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