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

In this article, fourteen new complexes have been synthesized by reactions ofSchiff base ligand (H₂L=N, N′-bis(salicylidene)-o-phenylenediamine) with differentlanthanide. Elemental analyses, Thermal gravimetric, Infrared (IR), Ultraviolet-Visible(UV) were carried out for these fourteen complexes. X-ray crysrallographic analysesindicated the composition of five lanthanide nitrate complexes of "3+3" sandwichstructure accord with [Ln3L3(CH₃OH)₂(NO₃)₃]·(CH₂Cl₂)·(CH₃OH)·(H₂O)₂[Ln=Tb(1), Dy (2), Ho (3), Er (4), Lu (5)]; the composition of one lanthanide acetic complexof "3+2" sandwich structure is [Nd2L3(CH3OH)](6); the composition of Zn2Lnheterotrimetallic complexes accord with [Ln(ZnL)₂(NO₃)₃(CH₃OH)₂]·CH₃OH·CH₂Cl₂[Ln=Pr (7), Nd (8)] and [Ln(ZnL)₂(NO₃)₃(CH₃OH)]·CH₃OH·CH₂Cl₂[Eu (9), Ho(10)]; the composition of chloridize complex is [YbL′2Cl₄]·L′·(CH₃OH)·(H₂O)(11),and the composition of methanol solvate chloridize rare earth compounds accord with[Ln₄Cl₆(CH₃OH)₁2(OH)₂]·4Cl·2CH₃OH [Ln=Gd (12), Dy (13), Er (14)]. Luminescentand magnetic properties were also studied.TG analyses indicated that the metal-organic framework decomposition temperatureof complexes1–11exceed350°C. The luminescent analyses indicated1showed thecharacteristic luminescence of Tb³⁺ions and ligand in the visible region, thetemperature and the solvent have great influence to the luminescence of the kind ofcomplexes, and complexes7–8showed the characteristic luminescence of ligand. TheNear infrared (NIR) luminescence analyses showed that the luminescence of complex11is metal-centered emission, and its lifetime was tested. Magnetic analyses of2,12and13showed that all of them exhibited antiferromagnetic behavior.