Vanillin Multicore Synthesis, Structure And Properties Of Lanthanide Complexes O, O-phenylenediamine

In this paper, two series of twenty discrete salen type polynuclear lanthanidecomplexes have been designed and synthesized by reactions of hexadentate salen typeligand H₂L (H₂L=N,N′-bis(2-oxy-3-methoxybenzylidene)-1,2-phenylenediamine) andlanthanide/transition metals. All the complexes were have been characterized by anumber of analytical techniques.The NIR luminescence and magnetic properties ofthese polynuclear complexes were investigated and discussed. The conclusions reachedin this thesis are listed as following:1. A series of salen type homo-polynuclear lanthanide complexes have beendesigned and synthesized by self-assembly reactions of H₂L and lanthanide metals.[Ln₂LL′L″(MeOH)₂(H₂O)](ClO₄)₃·CH₃OH·H₂O (Ln=Er (1), Yb (2)) are of the uniquesalen type homo-dinuclear structure.[Ln₃L₃(OAc)₃]·3CH₃OH·H₂O (Ln=Dy (3), Er (4),Yb (5)) are of homonuclear sandwich structure. The NIR luminescence of complexes2and5were investigated. Magnetic properties of complex3exhibits slow relaxation ofthe magnetization associated with single-molecule magnet behavior.2. A series of salen type hetero-polynuclear lanthanide complexes have beensynthesized by reactions of H₂L and lanthanide metals, transition metals and NH4PF₆.[ZnLHo(OAc)(NO₃)₂](6) and [ZnLnL(OAc)₃](Ln=Nd (7), Gd (8), Dy (9), Er (10),Yb (11)) are of the hetero-dinuclear structure.[DyZn₂L₂(OAc)₂](PF₆)·CH₂Cl₂·H₂O (Ln=La (12), Ce (13), Pr (14), Nd (15), Sm (16), Eu (17), Dy (18)) are of Zn–Ln–Znhetero-trinuclear structure.[Zn₂Er₄L₂(OAc)₁₀(CH₃OH)₄](PF₆)₂·2CH₃OH·2H₂O (Ln=Gd (19), Er (20)) are of Zn₂Ln₄hetero-hexanuclear structure. The NIR luminescence ofcomplexes7,11and15were investigated. Magnetic properties of complex19havebeen studied and it revealed a ferromagnetic behavior depending on Gd3+ions.