Synthesis, Structure And Properties Of Rare Earth Complexes

Salen type lanthanide complexes arecurrently of great interest not only their fascinating variety of structures but also their potential applications in the fields of luminescence and magnetism. In this paper, twenty-two salen type lanthanide complexes have been designed and synthesized through N,N’-bis（2-oxy-3-methoxybenzylidene）-1,2-phenylenediamine with various lanthanide salts. NIR luminescence and magnetic properties of these complexes were investigated and discussed. The conclusions are listed as following:Two series of salen type hetero-polynuclear lanthanide complexes have been synthesized by reactions of H₂ L, transition metals and lanthanide metals.[CdLn2L3（OAc）₂] [Ln = Nd（1）、Sm（2）、Eu（3）、Gd（4）、Tb（5）、Dy（6）、Ho（7）、Er（8）] are of the CdLn2 hetero-trinuclear structure. [CdYbL₂（OAc）]（9）,[CdLnL（CH₃OH）₂（OAc）₃] [Ln = Nd（10） 、 Dy（11） 、 Yb（12）] are of the CdLn hetero-dinuclear structure. [ZnLn L（OAc）₃] [Ln = Ho（13）, Er（14）],[Zn₂ErL₂（OAc）₂)]（PF₆）·CH₃OH·CH₂Cl₂（15）, [Zn₂Er4L₂（OAc）10（CH₃OH）₄]（PF₆）₂·2CH₃OH·2H₂O（16） are of the Zn-4f heteronuclear complexes. The reactions of H₂ L with Ln（OAc）₃·6H₂O, Ln（acac）₃·H₂O and Ln（ClO4）₃·9H₂O afforded complexes[Er2L（OAc）₄（CH₃OH）₂]·2CH₃OH（17）, [Ln2L3（CH₃OH）]·2CH₃OH [Ln = Ho（18）, Er（19）], [Er3L3（OAc）₃]·3CH₃OH·H₂O（20）, [Er2L（acac）₄]·2CH₂Cl₂（21）,[Er2LL¹L²ï¼ˆCH₃OH）（H₂O）₂]（ClO4）₂·CH₃OH·H₂O（22）. The NIR luminescence of complexes 1 、7-10、12-22 were investigated. Furthermore, the magnetic analysis unveils that complexes 6 and 11 are of field-induced SMMs behavior.