Copper And Rare Earth Heteronuclear Metal Schiff Base Complexes Synthesis And Structural Characterization

Two Schiff base compartmental ligands, H₂L¹, H₂L², derived from the condensation of salicyaldehyde with 1,3-diaminopropylane and 1,2-phenylenediamine, respectively, have been utilized to synthesize a series of 3d-4f heterobimetallic Schiff base complexes of the general formula [(L^ⅠCu^Ⅱ)₂Ln^Ⅲ(NO₃)₃] (Ln = La(1), Ce(2), Pr(3), Nd(4), Sm(5), H₂L¹ = N,N'-1,3-propylenebis(salicylaldimine)), [(L^ⅠCu^Ⅱ)₂YⅢ(NO₃)₃] (6), [(L²CuⅡ)₂Ln^Ⅲ(NO₃)₃] (Ln = La(7), Ce(8), Pr(9), Nd(10), Sm(11), H₂L² = N,N'-1,2-phenylenebis(salicylaldimine)), [(L²CuⅡ)₂Y^Ⅲ(NO₃)₃] (12) by reaction of the tetradentate copper(Ⅱ) Schiff base complex (L Cu, L Cu) and Samarium(Ⅲ) nitrate. These compounds are investigated by Elemental analysis, Thermal analyses, Infrared Spectra and UV Spectra, Fluorescence Spectra. The structures of complexes are also discussed.The frist crystal structure of the Cu(II)-Sm(III) Schiff-Base Complex (5) was determined at room temperature: the compound crystallizes in the triclinic space group P1|-, with a = 10.461(2), b = 14.838(3), c = 15.038(3) A, α = 104.54(3), β = 99.40(3), γ = 99.13(3)°, Z = 2. Least-squares refinement of the structure led to a conventional R factor of 0.0476.The samarium(III) ion is nine-coordinated with two bidentate L^ⅠCu molecules, two bidentate nitrate ions and one water molecule. The third nitrate ion is coordinated to one of the two copper atoms of L^ⅠCu. The Cu(Ⅱ) ion has square planar environment with the N2O2 donor atoms of the ligand. The Sm coordination sphere can be viewed as a tricapped trigonal prism.At room temperature, The fluorescence spectra of ligands and the...