The New Macrocyclic Schiff Base Synthesis, Characterization And Spectroscopic Properties Study

Bease of Schiff base complexes are of great importance in the field of biochemistry,coordination chemistry ,supermolecular chemistry,catalysis,electro -chemistry,etc.,the studies on macrocycle Schiff base metal complexes are paid much attention. Schiff base ligands are developing from simple monodentate ligands to multidentate and macrocyclic ligands.Transition mental macrocycle Schiff base complexes possess special structures,properties and widely uses,such as oxidation-reduction ,catalysis and chemical simulation for biological systems.Therefore,we firstly synthesized and characterized four macrocycle Schiff base ligands and their transition mental complexes .The spectral properties of the Schiff base ligands and their transition mental complexes were discussed as a function of alkyl chain length. This main content is shown as follows:1, Synthesis of mononuclear schiff base ligand L and complexes L-M(M=Mn³⁺,Fe³⁺, Co²⁺,Ni²⁺,Cu²⁺,Zn²⁺)The Schiff base 2,4-dihydroxybenzaldehyde - 1,2 - phenylendiamine L and its metal complexes was synthesized by the reaction of 2,4-dihydroxybenzaldehyde and 1,2 - phenylendianmine.The complexes L-M were obtained by the reaction of ligand L and melt acetate in methanol.The compounds were characterized by ¹HNMR,FT-IR ,UV-vis.2, Synthesis of macrocyclic schiff base ligand L₁ and complexes L₁-M (M=Mn³⁺, Fe³⁺,Co²⁺,Ni²⁺,Cu²⁺,Zn²⁺) (1), Synthesis of 5,5'-Methylene-bis-salicylaldehyde.5,5'-Methylene-bis-salicylaldehyd was synthesized from salicylaldehyde and trio -xane in glacialacetic acid ,and was characterized by ¹H NMR. (2), Synthesis of macrocyle schiff base ligand L₁ and its complexes L₁-M(M=Mn³⁺, Fe³⁺,Co²⁺,Ni²⁺Cu²⁺,Zn²⁺)The macrocycle schiff base base ligand L₁ was synthesized using Ca²⁺ as template inons in methanol. The compounds have been solved by Na₂CO₃ solution and become free ligand L₁. And the macrocycle schiff base base complexes L₁-M was synthesized by the reaction of L₁ and melt caetate in methanol. The structures of macrocyclic schiff base ligand and compounds were characterized by ¹HNMR,FT-IR, UV-vis, Molarconductance analyses.3, Synthesis of new macrocyle schiff base ligands L_n and its metal complexes L_n-M (M=Mn³⁺,Fe³⁺,Co²⁺,Ni²⁺,Cu²⁺,Zn²⁺) (1), Synthesis of dibromoalkyl1,4-dibromobutane was synthesized from 1,4-butanediol.The same synthesis method for 1,6-dibromohexane and 1,8-dibromooctane. (2), Synthesis of 2,4-dihydroxybenzaldehyde2,4-dihydroxybenzaldehyde was synthesized from resorcinol and DMF and dibromoalkyl. The structure was characterized by ¹H NMR. (3), Synthesis of α,ω-bis(3'-hydroxy-4'-formylphenyloxy)alkanes...