Development of high-functional electro-oxidation catalyst using a nickel-pincder complex

研究了有望作为甲醇氧化催化剂的镍-钳形配合物的合成。本工作合成了镍-钳形配合物，并对其电化学性质进行了研究。钳形配体对中心金属具有很强的给电子能力，因此有望降低络合物的氧化电位。合成了(N，C，N)和(S，C，N)型镍钳形配合物，并用循环伏安法测试了它们的电化学性质。通过将碱处理成钳形配体的臂上有两个仲硫酰胺的镍配合物，成功地产生了具有较低氧化电位的镍配合物。以该镍-钳形络合物为催化剂，对甲醇进行了电化学氧化实验。结果表明，甲醇的氧化反应在+0.8V(vs.Ag+/Ag)下进行，并研究了将催化剂固定在电极上的方法。

Synthesis of Ni-pincer complexes which are expected to work as an oxidation catalyst of methanol was investigated. In this work, Ni-pincer complexes were synthesized and their electrochemical properties were clarified. Pincer-type ligands show strong electron-donating ability to the centered metal, therefore they are expected to shift the oxidation potential of the complex lower. (N,C,N)- and (S,C,N)-type Ni-pincer complexes were synthesized, and their electrochemical properties were measured by cyclic voltammetry. Production of the Ni complex which has lower oxidation potential was succeeded by treatment of a base to a Ni complex which has two secondary thioamides in the arm of the pincer ligand. Electrochemical oxidation of methanol using this Ni-pincer complex as a catalyst was tried. As a result, oxidation of methanol was progressed at ca. +0.8 V (vs. Ag+/Ag).The method of fixing the catalyst on an electrode was also examined.