Metal-ligand bond lengths

Changes in the charge of the central atom also strongly affect the metal-ligand bond length and the ionic-covalent share in fluoride complexes, which in turn impact the vibration spectra. Fig. 46 shows the dependence of asymmetric valence vibrations on the charge of the central atom. The spectral data for Mo, W, Zr, Hf fluoride compounds were taken from [71,115,137]. 

AS = 2). Indeed, an average metal-ligand bond length change between the LS and HS states AR 0.17 A has been found for iron(II) complexes [6]. For... 

Table 17. Average metal-ligand bond lengths R for HS and LS isomers and bond length variation AR for complete HS <-> LS conversion of spin transition compounds...

A quantum-mechanical description of spin-state equilibria has been proposed on the basis of a radiationless nonadiabatic multiphonon process [117]. Calculated rate constants of, e.g., k 10 s for iron(II) and iron(III) are in reasonable agreement with the observed values between 10 and 10 s . Here again the quantity of largest influence is the metal-ligand bond length change AR and the consequent variation of stretching vibrations. 

Metal-Oxygen and Metal-Ligand Bond Lengths for Metals Commonly Used in the Aldol Condensation ... 

Liu, W. and Thorp, FI. FI. (1993). Bond valence sum analysis of metal-ligand bond lengths in metalloenzymes and model complexes. 2. Refined distances and other enzymes. Inorg. Chem. 32, 4102-5. 

It has been long known that for a given transition-metal cluster the open-shell and the closed-shell species may differ. Typically, metal-ligand bond lengths are elongated for the open-shell structures, where the metal centers carry local spins and electrons occupy antibonding orbitals, in comparison to their closed-shell... 

First the oxidant (0) and reductant (R) come together to form a precursor complex. Activation of the precursor complex, which includes reorganization of solvent molecules and changes in metal-ligand bond lengths, must occur before electron transfer can take place. The final step Is the dissociation of the ion pair into product ions. 

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