Complexes, magnetic properties spectra

It is clear that there exists a close relationship between the optical and magnetic properties of ferric haemoproteins. Attempts have been made to separate the contributions to the spectrum from the two spin states by making optical and magnetic measurements over a small temperature range (24). Before we discuss the spectra in detail, we must summarise briefly the complex magnetic properties of ferric haemoproteins. 

Stable Mn(HI) compounds, Mn(R2r fc)3, have been known for a long time (42, 46). The structure of Mn(Et2C tc)3 is elucidated (47). The inner geometry of the Mn(CS2)3 core does not conform to the usual D3 point symmetry of transition metal complexes of this type, but shows a strong distortion attributed to the Jahn-Teller effect. The electronic spectrum (48, 49) and the magnetic properties of this type of complexes are well studied (50). 

In their pursuit of determining solution structures of dinuclear copper complexes as carried out for complex (29) (Section 6.6.3.1.1). Comba reported complex (431) (r = 0.02 Cu-Cu 6.9 A, comparable with the values of 7.2 A predicted by molecular mechanics calculations and 6.7 A obtained from the simulated EPR spectrum).54 They reported369 complexes (432) (square planar) and (433) (Cu-Cu 3.35 A) as well. As part of studying magnetic properties of mono-, di-, and... 

The AOM has been used to parameterise the ligand field in detailed analyses of magnetic properties in non-cubic complexes. It may also be used to obtain the ground state wave function in systems of low symmetry where d-orbital mixing is important the mixing coefficients can be obtained from the off-diagonal elements of the AOM matrix in terms of parameters, whose magnitudes can be found from the d-d spectrum. 

Transitions between different electronic states result in absorption of energy in the ultraviolet, visible and, for many transition metal complexes, the near infrared region of the electromagnetic spectrum. Spectroscopic methods that probe these electronic transitions can, in favourable conditions, provide detailed information on the electronic and magnetic properties of both the metal ion and its ligands. 

N-Do/Jor Ligands. The full account of the preparation and properties of V[N(SiMc3)2]3 has been published. (Et4N)3[V(NCSe)e] has been prepared and its electronic spectrum reported in several solvents. The electronic spectra of fVL lfNCSij complexes (L = py, 3-picoline, 3,4-lutidine, or 3,5-lutidine) are consistent with tetrahedral microsymmetry about the V " atom, and the magnetic properties of V complexes with the thiosemicarbazones of salicylaldehyde and pyruvic acid have been interpreted in terms of a tetragonal environment about the metal. ... 

Goodgame, M. Cotton, F. A. (1961) Magnetic investigation of spin-fiee cobaltous complexes IV. Magnetic properties and spectrum of cobalt(II) orthosilicate. J. Phys. Chem. Solids, 65, 791-2. 

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