Abstract
We synthesized two terminal alkynyl modified Salen ligands, H2L, and their metal complexes, ML (n=1, 2, M=Ni, Cu, Mn). The ligands and complexes were characterized by H nuclear magnetic resonance (H NMR) spectroscopy, electrospray ionization mass spectrometry (ESI-MS), elemental analysis, Fourier transform infrared (FT-IR) spectroscopy, and ultraviolet visible (UV-Vis) spectroscopy. The redox properties of the compounds were investigated with cyclic voltammetry (CV). Imine redox peaks appeared in the CV curves of all the ligands except H2L. The Ni and Cu complexes underwent two single electron redox processes in the scanning range. Mn complexes gave a pair of quasi-reversible voltammetric peaks, which corresponded to the redox process between Mn(III)/Mn(II). Molar conductivity measurements of the complexes showed that they were all weak electrolytes with certain conductivity.
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