US EPA

4726039 

Journal Article 

Diazadienes in lanthanide chemistry: transformation in the diamide and enamine amide ligand systems. Synthesis, structures, and properties of complexes (2,6-Pr-i 2C6H3N-C(=CH2)C(=CH2)-NC6H3Pri (2)-2,6)-Yb(THF)(2)(mu-Cl)(2)Li(THF)(2) and (2,6-Pr-i 2C6H3N(H)C(Me)=C(Me)-NC6H3Pri (2)-2,6)GdCl(THF)(mu-Cl)(2)Li(THF)(2) 

Shestakov, BG; Makhrova, TV; Lyssenko, KA; Trifonov, AA 

2013 

1 

Russian Chemical Bulletin
ISSN: 1066-5285
EISSN: 1573-9171 

62 

2 

412-418 

10.1007/s11172-013-0055-8 

WOS:000328852300018 

The reaction of lithium amide derivative [2,6-Pr-i 2C6H3N-C(=CH2)C(=CH2)-NC6H3Pri (2)-2,6][Li(THF) (n) ](2), which was obtained in situ by the interaction of 1,4-bis(2,6-di-isopropylphenyl)-2,3-dimethyl-1,4-diaza-1,3-butadiene with two equivalents of (BuLi)-Li-n, with anhydrous YbCl3 (1: 1) affords metallacyclic ate-complex [2,6-Pr-i 2C6H3N-C(=CH2)C(=CH2)-NC6H3Pri (2)-2,6]Yb(THF)(2)(mu-Cl)(2)Li(THF)(2) (1) containing diamide fragment [N-C(=CH2)-C(=CH2)-N]Yb. The reaction of dilithium derivative [(2,6-Pr-i 2C6H3NC(Me)=C(Me)NC6H3Pri (2)-2,6)](2-)[Li+(THF) (n) ](2) with GdCl3 in THF (molar ratio 1: 1) does not result in the formation of a gadolinium complex with the dianionic enediamide ligand but proceeds via the protonation of one of the M-N bonds to form complex [2,6-Pr-i 2C6H3N(H)C(Me)=C(Me)NC6H3Pri (2)-2,6]GdCl(THF)(mu-Cl)(2)Li(THF)(2) (2) bearing the monoanionic enamine amide fragment. The structures of complexes 1 and 2 were determined by X-ray diffraction analysis. 

lanthanides; diazadienes; enamine amide ligand; diamide ligand; N,N-ligand; synthesis; structure