Yonghe Zhang ionocovalent theory applications (12) I.Methods
American Huilin Institute http://www.amhuilin.com/
On the basis of Zhang’s ionic-covalent theory [1,2], Portier et al. presented a new parameter, the ionic-covalent parameter (ICP) from the quantitative evaluation of acidic strengths of Lewis acids proposed by Zhang (1982):
ICP = log(P) - 1.38X + 2.07
P: polarizing power of the cation (P = Z/r2. r: Shannon ionic radius); X electronegativity (Portier et al. (1994) ).
Lenglet reviewed : The ICP of cations such as the Zhang’s parameter takes into accout the ionic forces (polarizing power) and the covalent forces (electronegativity). Correlation between ICP and various thermodynamic (bond energy, formation enthalpy, fusion temperature) and electronic properties have been emphasized.
And Lenglet  applied Zhang Lewis acid strengths and ICP to ligand field spectroscopy and chemical bonding in some transition metal ions-containing oxidic solids.
 Y. Zhang,, Inorg Chem., 1982, 21, 3886.
 Y. Zhang,, Inorg Chem., 1982, 21, 3889.
 J. Portier, G. Campet, J. Etoumeau and B.Tanguy, Alloys Comp.,1994a, 209, 59.
 J.Portier, G. Campet, J. Etoumeau and B.Tanguy, Alloys Comp.,1994b, 209, 285.
 M. Lenglet, Materials Research Bulletin, 2000, Vol. 35 (4) pp. 531-543.