| Summary: | 碩士 === 國立臺灣大學 === 化學研究所 === 104 === This study demonstrates the synthesis, crystal structure and properties of a novel asymmetrical metal string complex, cis-[Ni3(ppap)2(H2appp)2] (1), and di-nuclear ruthenium metal complexes, [Ru2(Hppap)3Cl2](BF4) (2) and [Ru2(Hppap)3Cl2] (3), supported by oxygen-containing H2ppap ligand (H2ppap = 6-(5-phenylpyridyl)-amino-2-acetylamino-pyridine, H3appp = 6-amino-(5-phenylpyridyl)-2-pyridylamine ).
For the trinickel metal string complex 1, the central Ni2+ ion is square planar with four short Ni—Namido distances at a range of 1.879 - 1.894 Å, indicating a low-spin (S = 0) square planar Ni2+ configuration. Two terminal Ni2+ ions are in a square pyramidal environment with average Ni—Npyridine distances in the range of 2.069 - 2.095 Å. The averaged Ni—Ni distances in 1 are 2.364 Å.
The magnetic susceptibility measurements in the solid state show that both complex 1 and 2 have an antiferromagnetic interaction. The electrochemistry of complex 2 is investigated by cyclic voltammetry. It exhibits one electrochemically reversible one-electron redox process at E1/2 = 0.12 V in CH2Cl2 containing 0.1 M TBAP. The E1/2 = 0.12 V is described as the one-electron reduction for [Ru2]6+/[Ru2]5+ process.
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