Preparation of Bis(phthalocyaninato)lutetium with Various Substituents and Their Electrochemical Properties
作者:Yunqi Liu、Kiyotaka Shigehara、Akira Yamada
DOI:10.1246/bcsj.65.250
日期:1992.1
A series of bis(phthalocyaninato)lutetium complexes with substituents on each benzoring [Lu(pc2R8)] was prepared and the electrochromic behavior investigated by means of cyclic voltammetry of coated electrodes.Although the unsubstituted complex, Lu(pc)2, showed multistep electrochromism, its stability was quite unsatisfactory due to a falling-off of films from the electrode surface upon repetitive potential scanning. In the case of R = t-butyl, the improved solubility in organic solvents brought about an easier filming process and better adhesion to the electrode surface, though its high oxidation potential caused a cleavage of bi-peripheral complex. In contrast, complexes with electron-donating groups, such as R = propoxy or neopentyloxy, showed a lower oxidation potential and better stability upon repetitive potential scans, though the oxidized color was brownish rather than bright red. Complexes with 4 groups each of tetra-t-butyl and tetra propoxy had the oxidation potential close to that of octapropoxy or octakis(neopentyloxy) complexes and showed much improved stability and electrochromic behavior.
制备了一系列苯并环上带有取代基的双(酞菁)镥配合物[Lu(pc2R8)],并通过涂层电极的循环伏安法研究了其电致变色行为。尽管未取代的配合物Lu(pc)2表现出多步电致变色现象,由于重复电位扫描时薄膜从电极表面脱落,其稳定性非常不令人满意。在R=叔丁基的情况下,在有机溶剂中溶解度的提高带来了更容易的成膜过程和对电极表面更好的附着力,尽管其高氧化电位导致双外围络合物的裂解。相比之下,具有给电子基团(例如R =丙氧基或新戊氧基)的配合物在重复电位扫描时表现出较低的氧化电位和更好的稳定性,尽管氧化后的颜色为棕色而不是亮红色。四叔丁基和四丙氧基各有 4 个基团的配合物具有接近八丙氧基或八(新戊氧基)配合物的氧化电位,并且表现出大大改善的稳定性和电致变色行为。