Here, we report the synthesis and magnetic properties investigation of a series of new organometallic homoleptic complexes Li(DME)[Ln(DAD)] (Ln = Dy (1a, 1b), Tb(2), and Er(3)) based on paramagnetic Ln(iii) ions coordinated by an ene-diamido[2,6-iPrCHN-CH[double bond, length as m-dash]CH-NCHiPr-2,6] (DAD) ligand. Dy-based compounds exhibit a genuine single-molecule magnet (SMM) behaviour, while the Tb analogue shows a field-induced slow relaxation of the magnetisation.
A steric control on the reductive capacity of ytterbocenes towards iminopyridine ligands is described. The reaction of (η(5)-C(9)H(7))(2)Yb(THF)(2) with a series of 6-organyl-2-(aldimino)pyridyl ligands (IPy) takes place with the replacement of two THF molecules by one IPy unit. In contrast to the rich reductive ytterbocene chemistry described in the presence of the unsubstituted (aldimino)pyridyl ligand, all 6-aryl substituted IPys scrutinized hereafter are involved into the metal coordination as neutral bidentate {N,N} or tridentate {N,N,S; N,N,O} ligands, with no changes of the metal oxidation state in the final complexes. A series of Yb(II) metallocene complexes of general formula (η(5)-C(9)H(7))(2)Yb(II)(η(2) or η(3))[2,6-(i)Pr(2)(C(6)H(3))N=CH(C(5)H(3)N)-6-R)] have been isolated and completely characterized. The stereo-electronic role of the aryl substituents in the IPy ligands on the ytterbocene redox chemistry has also been addressed.
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