TCNQ Schiff Base Metal Complexes Synthesis, Characterization And Performance

In this paper, two series of TCNQ (TCNQ=tetracyano-p-quinodimethane) Schiff base metal complexes, speculated as, [H2L1]2Gd(TCNQ)3 (1), {[NiL1]2Gd(TCNQ)2}·TCNQ·CH3OH·2CH3CN (2) {[CoL1]2Gd(TCNQ)2}·TCNQ·CH3OH·2CH3CN (3) {[ZnL1]2Gd(TCNQ)2}·TCNQ·CH3OH (4), [H2L2]2Gd(TCNQ)3 (5) {[CuL2]2Gd(TCNQ)2}·TCNQ·CH3OH·2CH3CN (6) {[NiL2]2Gd(TCNQ)2}·TCNQ·CH3OH (7),{[CoL2]2Gd(TCNQ)2}·TCNQ·CH3OH (8), {[ZnL2]2Gd(TCNQ)2}·TCNQ·CH3OH·2CH3CN (9) (L1=N, N'-bis (2-hydroxy-3-methoxybenzylidene)-1,3-dia minopropane), L2= N, N'-bis(2-oxy-3-methoxybenzylidene)-1,2-phenylenediamine), have been synthesized under the reaction of LiTCNQ with two arrays of hexadentate Schiff base metal complexes respectively under standard Schlenk techniques with nitrogen protection. The TCNQ Schiff base metal complexes have been characterized by Elemental analyses, Thermal gravimetric, XRD, Infrared (IR) and Ultraviolet-Visible (UV).Conductivity measurements show that complexes all behave as weak electrolytes in either CH3OH or CH3CN at 25℃.The cyclic voltammetry properties of 1-9 have been investigated in acetonitrile solution with tetra-n-butylammonium hexafluorophosphate as electrolytes. Their electrochemical HOMO-LUMO gap and reversibility are also examined. One reversible one-electron oxidation and one reversible one-electron reduction both exist in 1-9.At 1000 Oe, in the temperature range 2-300 K, the variable-temperature magnetic properties of 2,4 and 5 have been well studied. The complex 2 shows a weak ferromagnetic interaction between Ni(Ⅱ), Gd(Ⅲ) and Ni(Ⅱ) ions, however an antiferromagnetic interaction can be observed in both 4 and 5.