Protonolysis
of [YMe3]
n
with
2-{(N-2,6-dialkylphenyl)iminomethyl)}pyrroles (alkyl = iPr (L1), Me (L2)) gave homoleptic iminopyrrolyl
complexes YL1
3 and YL2
3 as well as the complex [L2YL2,Me]2 containing a dianionic pyrrolaldiminato ligand, formed via methylation
of the imino backbone. Treatment of the half-sandwich complex [(C5Me5)YMe2]3 and yttrocene
(C5Me5)2YMe(THF) with either 2 or
1 equiv of HL afforded the monomeric complexes (C5Me5)YL2 and (C5Me5)2YL,respectively. The complex (C5Me5)YL2
2 readily underwent Ln→Al iminopyrrolyl
ligand transfer in the presence of trimethylaluminum, producing the
known (C5Me5)Y(AlMe4)2. Salt metatheses of homoleptic Ln(AlMe4)3 (Ln
= Y, La) with KL gave complicated reaction mixtures from which the
η5/η1:κ1 pyrrolaldiminato-bridged
complex [L1,MeLa(AlMe4)]2 and bis(tetramethylaluminate)
complex L2Y(AlMe4)2 could be isolated
and crystallographically characterized. Moreover, the solid-state
structures of YL2
3, [L2YL2,Me]2, (C5Me5)YL1
2, (C5Me5)2YL1, and L2AlMe2 are presented.