How ionocavalency predicts raw material?

Yonghe Zhang

American Huilin Institute

 Changzheng et al. presented an effective synthetic protocol to produce high quality InN nanocrystals using indium iodide (InI3)[1]. There has been  a question: "Is it possible for high-quality InN to be synthesized from indium halides?  The positive answer will be found in the present work using InI3. Concerning the four kinds of indium halides, InF3, InCl3, InBr3, and InI3,.InI3 has a stronger covalent ability than the other three. As is known, when two atoms form a chemical bond, the greater the difference between the electronegativity values for the two atoms, the more ionic the chemical bond between them (Zhang, 1982) [2]” 

   According to Zhang electronegativity model which is based on the quantum mechanical electron configurations, n*(Iz/R) ½/rc2 , both the effective principle quantum number, n*, and  the covalent radius, rc,  for halogens are increased in the order: F>Cl>Br>I [2]. The polarizability of the anion will be ralated to its "softness," that is, to the deformability of its electron cloud. Both increasing n* and rwill cause this cloud to be less under the influence of the nuclear charge of the anion and more easily influenced by the charge on the cation. So concerning the four kinds of indium halides, InI3 is more covalent than the other three.

So it is possible for high-quality InN to be synthesized from indium halides (InI3).

[1] Wu. Changzheng, Li. Tanwei, Lei. Lanyu, Hu. Shuangquan, Liu. Yi and Xie. Yi, New J. Chem., 2005, 29, 1610.

[2] Y. Zhang,1982, Inorg Chem., 1982, 21, 3886;3889.

     Y. Zhang,, in "Introduction to Modern Inorganic Chemistry" ( Eds: K. M. Mackay, R. A. Mackay, W. Henderson, ) 6thed., Nelson Thornes, United Kingdom,2002, pp 53-54).

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