Odd Electron Bond
Odd Electron Bond
It may be defined as, “The bonds in which odd numbers of electrons are used in its formation are known as odd-electron bonds and the molecules are called odd-electron molecules. These molecules are quite stable and paramagnetic in nature”.
Some examples of such molecules and ions are given below:
Characteristics and Conditions of the Formation of Three Electrons Bond:
- If has been found that three electrons bond can never be formed if electronegativity difference exceed 0.5.
- Three electrons bond must have larger bond length as compared to two electrons bond and must possess less bond energy
- This type of bond forms hybrid between two extreme structures.
- Three electrons bond molecules have tendency to dimerize.
- The three electrons bond is half of an electron pair bond.
- An odd bond is mostly equivalent to 1/2 normal electron pair bond.
(i) ion: the helium cation exhibits two resonance form (I) and (II)
The binding energy of the ion is
(ii) mole: generally oxygen molecule is represented as:
According to this structure, oxygen molecule should be diamagnetic, while oxygen molecule is paramagnetic which shows the presence of two unpaired electrons hence oxygen molecule may be represented as:
Since in this structure, there are two three electrons bonds hence such molecule is called “double-odd molecule”. This structure also confirms the presence of two unpaired electrons.
(iii) molecule: two resonating structures having three electron bond may be written as:
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