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LCP theory
In chemistry, ligand close packing theory (LCP theory), sometimes called the ligand close packing model describes how ligand – ligand repulsions affect the geometry around a central atom.〔''Teaching the VSEPR model and electron densities'' R. J. Gillespie and C. F. Matta, Chem. Educ. Res. Pract. Eur.: 2001, 2, 73-90〕 It has been developed by R. J. Gillespie and others from 1997 onwards 〔Reinterpretation of the Lengths of Bonds to Fluorine in Terms of an Almost Ionic Model E A. Robinson , S A. Johnson, Ting-Hua Tang, and R J. Gillespie Inorg. Chem., 36 (14), 3022 -3030, 1997. ic961315b S0020-1669(96)01315-8〕 and is said to sit alongside VSEPR〔 which was originally developed by R. J. Gillespie and R Nyholm.〔''Inorganic stereochemistry'' Gillespie, R.J. & Nyholm, R.S. (1957). Quarterly Reviews of the Chemical Society, 11, 339-380 〕 The inter-ligand distances in a wide range of molecules have been determined. The example below shows a series of related molecules:〔''Bonding and Geometry of OCF3−, ONF3, and Related Molecules in Terms of the Ligand Close Packing Model'' Gillespie RJ, Robinson EA, Heard GL. Inorg Chem. 1998 Dec 28;37(26):6884-6889 〕
The consistency of the interligand distances (F-F and O-F) in the above molecules is striking and this phenomenon is repeated across a wide range of molecules and forms the basis for LCP theory.
==Ligand radius==
From a study of known structural data a series of inter-ligand distances has been determined〔 and it has been found that there is a constant inter-ligand radius for a given central atom. The table below shows the inter-ligand radius (pm) for some of the period 2 elements:
The ligand radius should not be confused with the ionic radius.
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