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why CO(NH3)6 2+ IS A HIGH SPIN COMPLEX THOUGH NH3 IS A STRONG FIELD LIGAND? ALSO WHAT ABOUT NI(CN)4 2+ IN THIS CASE THERE IS PAIRING IN THE ELECTRONS OF eg ORBITALS IT IS HIGH SPIN OR LOW SPIN COMPLEX ? I AM CONFUSED THAT LOW SPIN MEANS PAIRING IN t2g and eg ELECTRONS OR IT CAN BE IN eg eg ELECTRONS ALSO?

TANU BATRA , 14 Years ago
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sujit royal

NH3 is not a strong field ligand it is neutral ligand.
in Ni(CN)6 2+ pairing takes place and so elctron enters into  t2g as CN is a strong field ligand
the distribution of electrons in degenerate orbital t2g follows hunds rule for the first 3 electrons 
but the 4th electron enters into t2g and gets paired up if the ligand is strong
and it enters into eg if the ligand is weak
weak field ligands have low spin and strong field ligands have high spin.

 

Last Activity: 14 Years ago
Aman Bansal

Dear Tanu,

Crystal field theory (CFT) is a model that describes the electronic structure of transition metal compounds, all of which can be considered coordination complexes. CFT successfully accounts for some magnetic properties, colours, hydration enthalpies, and spinel structures of transition metal complexes, but it does not attempt to describe bonding. CFT was developed by physicists Hans Betheand John Hasbrouck van Vleck[1] in the 1930s. CFT was subsequently combined with molecular orbital theory to form the more realistic and complex ligand field theory (LFT), which delivers insight into the process of chemical bonding in transition metal complexes.

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