The Element Displacement Principle

The groups obtained by fluorine displacement are different from Grimm s pseudoelements, being neither isoelectronic nor isoprotonic with their reference atoms and should conceptually be clearly differentiated from them. It is suitable to call these and other radicals obtained similarly paraelements.3 

Each paraelement for its part is then able to function as a ligand. Thus, for example, using the halogen-like CF3 radical, the first-order derivative paraelements shown below are obtained. 

2 Paraelements of this group are only stable as cations. 

If first-order derivative paraelements are themselves used as ligands this system of nomenclature leads to second-order derivative paraelements, e.g., using CF3S. This procedure can be continued in many cases with meaningful results. 

Which sort of paraelements do we obtain with ligands like oxygen, sulfur, or nitrogen When any one of these is used as the ligand a displacement of two or three groups must of course result, as follows  

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THE ELEMENT DISPLACEMENT PRINCIPLE A NEW GUIDE IN p-BLOCK ELEMENT CHEMISTRY1... 

III. Application of the Element Displacement Principle to Recent Chemical Problems... 

It is very difficult at first sight to understand why substances like P7R3, P4[Si(CH3)2]3 and also Sb73- should have the same structure as P4S3. With the aid of the element displacement principle this question can be answered without difficulty. In the cases mentioned the molecules contain a P4 and an Sl>4 unit and the other parts can be written as... 

The Element Displacement Principle A New Guide in p-BIock Element Chemistry A. Haas... 

Haas A (1984) The element displacement principle a new guide in P-block element chemistry. Adv Inoig Chem Radiochem 28 167-202. doi 10.1016/S0898-8838(08)60208-l... 

The syntheses of a large number of Group 15-17 onium cations such as S2F, H2SF+, H2OF+, and Br5+ from the reactions of the monfluoroxenonium hexafluorometalates XeF MF6 where M = As or Sb are described in a later chapter by Minkwitz and Back. As a further example of the utility of the element displacement principle 189-192), Haas and Brosius demonstrate the influence of fluorine, trifluoromethyl, trifluoromethylsulfenyl, and trifluoromethylselenyl on the... 

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