Bonds classification

TABLE 13-20 Hydrogen Bonding Classification of Chemical Families... 

M. L. H. Green, J. Organomet. Chem. 500 (1983), 127. The Green method is also called the Covalent-Bond-Classification (CBC) method. 

Nitrides can be sub-divided into ionic, covalent and interstitial types.An alternate general classification of nitrides, based on bonding classification, as ionic, covalent and metallic has also been applied. Ionic or salt-like nitrides are formed by electropositive elements such as Li, Mg, Ca, Sr, Ba, Cu, Zn, Cd and Hg and possess formulae which correspond to those expected on the basis of the combination of the metal ion with ions. A range of covalent nitrides are known and are exhibited by less electropositive elements such as B, S, P, C and Si. Interstitial nitrides are formed by some transition metals and refer to compounds which can be described in terms of the occupancy of interstitial sites in close packed metallic structures by nitrogen atoms. Oxygen can also be accommodated within these structures and a range of oxynitrides are known to... 

CBC method, see Covalent bond classification method -bridged complexes... 

Covalent bond classification method, organotransition metal compounds ([Pg.87]

Table 4-1- Chemical bonds classification by electronic structure and properties [11].

Keywords Hydrogen bonding definition of hydrogen bond classification of hydrogen bonding... 

Covalent bond classification and elementary bonding concepts... 

Figure 1 Classification and examples of L, X, and Z ligands according to the Covalent Bond Classification method...

Figure 14. Schematic nature of the metal-chemisorbate charge polarization for bonding classifications A, B , Bd and C, as exemplified by orbital interactions for Cl, Na, CO and NH). Reprinted with permission from S. A. Wasileski el al., J. Am. Chem. Soc., 124, (2002) 6796. Copyright 2002, American Chemical Society.

Note that bond classifications of this type are not rigorous the transition from one type to another is gradual. Therefore, intermediate bond types do exist [16], although for simplicity in the following discussion a rigorous classification of bond type is presented. 

The Covalent Bond Classification (CBC) Method is an insightful approach specifically designed for covalent molecules and is particularly applicable to organometallic compounds. The conceptual core of the CBC method is to classify each ligand as a neutral species on the basis of its orbital interactions with the metal. This classification requires considering three fundamental interactions, represented by the symbols L, X, and Z... 

FIGURE 13.52 Covalent Bond Classification of Iron Complexes. 

Covalent Bond Classification Method 523 TABLE 13.9 Information Available from the Equivalent Neutral Class Formula... 

Use the Covalent Bond Classification Method to classify these complexes with a [ML/X ZJ formula. With charged species, reduce the formula to its equivalent neutral class. 

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