Ligands electronegativity

Fig. 7.4 Isomer shift (relative to Ni metal and corrected for SOD) as a function of ligand electronegativity (plot A) and as a function of nickel-ligand ionicity (plot B) (from [9])...

Let us now attempt to express Bent s rule in more quantitative form. The dependence of hybrid p character fp on ligand electronegativity xl is illustrated in Fig. 3.20 for a series of 40 mono-substituted ALH hydrides, where L is chosen from the substituent series of first- and second-row ligands... 

Fig. 59. Dependence of the energy gap between no bond and charge transfer configurations as a function of ligand electronegativity. Increasing ligand electronegativity results into stronger bonding between the central atom and each of the ligands...

Fig. 20. Correlation between the sum of the X and Y ligand electronegativities and the S=0 bond length in XSO2Y sulfones )...

Mossbauer spectra of a series of Sn(Pc)X2 have been studied. The linear relationship between the isomer shift and the axial ligand electronegativity is interpreted in terms of an electron density increase on the Sn atom and a decrease in n donation from Pc to Sn with an increase in axial tr donation.198 This is supported by X-ray photoelectron spectroscopy. 

Hz, Vp jj = 2430 cm-l) ( 1) and other equatorial hydridophos-phoranes (3). These observations are reconciled with an apical P-H disposition for in solution on the basis of a correlation between Jpjj and ligand electronegativity (Equation 1). This was developed using data for a large number of hydridophosphoranes... 

Ligand electronegativity changes may have decisive effects, however, on the symmetry choices of various bipyramidal systems, of which the trigonal bipyramidal configuration is the simplest. 

Although quite broad, Mg resonances of organomagnesium compounds have been reported. The shift is sensitive to solvation and ligand electronegativity, and resonances for the Schlenk equilibrium species have been reported. Beryllium-9 NMR spectra are more informative than those of In... 

The nephelauxetic effect is a reduction of the electrostatic interaction of the luminescent-ion electrons when the covalency of the bonds increases, resulting in a lowering of the position of the energy levels. This effect therefore increases with decreasing ligand electronegativity ... 

The radiative rate is increased by covalency, which causes admixing of states of opposite parity. The excited-state lifetime becomes shorter with decreasing ligand electronegativity, as... 

Major factors affecting 5 Sn values are (i) the electronegativity of the groups attached to tin and (ii) the coordination number at tin. An illustration of the effect of ligand electronegativities is the change in 5 Sn values for the group of... 

Dialkyldithiophosphates are also soft ligands (electronegativity of sulfur 2.5) and as part of a systematic study for their binding properties to the actinides ions we report the results of... 

The ligand distribution over the axial and equatorial sites of the trigonal bipyramid for all unambiguous structural determinations is in accordance with electronegativity predictions. An apicophilicity series which differs in order from that based on ligand electronegativities has not as yet been established on the basis of diffraction studies. 

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