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• 10025-76-0 europium(III) chloride 

Relevant academic research and scientific papers

Catalytic addition of amines to carbodIImides by bis(β-diketiminate)lanthanide(II) complexes and mechanistic studies

Reduction reactions of bis(β-diketiminate)lanthanide(iii) chlorides formed in situ by reactions of anhydrous LnCl3 with 2 equiv. of sodium salt of the β-diketiminate ligand in THF with a Na/K alloy afforded a series of bis(β-diketiminate)lanthanide(ii) complexes LnL2(THF)n (L = L26-Me2 = [N(2,6-Me2C6H3)C(Me)]2CH-, n = 1, Ln = Eu (1); L = L2,4,6-Me3 = [N(2,4,6-Me3C6H2)C(Me)]2CH-, n = 1, Ln = Eu (2); L = L2,6-iPr2 = [N(2,6-iPr2C6H3)C(Me)]2CH-, n = 0, Ln = Eu (3), Sm (4); L = L2,6-ipr2Ph = [(2,6-iPr2C6H3)NC(Me)CHC(Me)N(C6H5)]-, n = 0, Ln = Eu (5), Yb (6); L = L2-Me = [N(2-MeC6H4)C(Me)]2CH-, n = 1, Ln = Yb (7)) in high yields. All the complexes, especially the complexes of SmII (4) and EuII (5), were found to be excellent pre-catalysts for catalytic addition of amines to carbodiimides to multi-substituted guanidines with a wide scope of substrates. The activity depends both on the central metals and the ligands with the active sequence of YbII II and EuII II and L2,6-Me2 2,4,6-Me3 ～ L2,6-iPr2 2,6-ipr2Ph for the ligands. The mechanistic study by the isolation of guanidinate species and their reactivity revealed that EuII monoguanidinate complexes Eu(L2,6-Me2)[(C6H5N)C(NHCy)(NCy)](DME) (8) and Eu(L2,6-ipr2Ph)[(C6H5N)C(NHCy)(NCy)](THF)2 (9) should be the key active intermediates for the systems with EuII complexes and a YbIII bis(guanidinate) complex Yb(L2-Me)[(C6H5N)C(NHCy)(NCy)]2 (11) for the system using a YbII complex.

Reduction of sterically hindered β-diketiminato europium(III) complexes by the β-diketiminato anion: A convenient route for the synthesis of β-diketiminato europium(II) complexes

The metathesis reaction of anhydrous EuCl3 with sodium salt of bulky β-diketiminato NaL (L = [N(2, 4, 6- Me3C6H 2)C(Me)]2CH-, L2, 4, 6-Me3; [N(2,6-iPr2Csub