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Why do lanthanides have less tendency to form complexes and are less basic when compared to actinoid elements?

Why do lanthanides have less tendency to form complexes and are less basic when compared to actinoid elements?

Grade:12

2 Answers

SAGAR SINGH - IIT DELHI
879 Points
11 years ago

Dear shailja,

They do not form Ln=O or Ln≡N multiple bonds of the type known for many transition
metals and certain actinides.Unlike the actinides, they do not form stable carbonyls and have (virtually) no chemistry in the 0 oxidation state.The 4f orbitals in the Ln3+ ion do not participate directly in bonding, being well shielded by the 5s2 and 5p6 orbitals. Their spectroscopic and magnetic properties are thus largely uninfluenced by the ligand.

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Sagar Singh

B.Tech IIT Delhi

Deepak lambora
13 Points
3 years ago
Because ions of actinides are highly charge and are of Small size so actinides form more comples...than lanthanidesOrder of complex tendency of actinides An+4 >ano4+2>an+3>ano2+And complexes tendency of lanthanides areLn2+

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