Complexes of Ln3+ with polyether ligands

These complexes all have poor thermodynamic stability and so cannot be prepared in aqueous solution.

Click on the links to display the structures

15_crown_5 tetraglyme 18_crown_6

Eu complex with 15-C-5
[Eu(15-C-5)(NO3)3]

La complex with tetraglyme - open chain analogue of 15-C-5
[La(tetraglyme)(NO3)3]

La complex with 18-C-6
[La(18-C-6)(NO3)3]

Compare the La complex with the Dy complex. The 18-C-6 has to distort in order to bind to the smaller Dy3+ ion.
[Dy(18-C-6)(NO3)3]

CHEM411 index