Direct observation of molecular images of lanthanide phthalocyanines
作者:W.P. Zhang、K.H. Kuo、Y.F. Hou、J.Z. Ni
DOI:10.1016/0022-4596(88)90351-9
日期:1988.6
Lanthanide phthalocyanine (LnPc2H: Ln =Nd, Tb, Er, Tm, Yb, and Lu) thin films prepared epitaxially on KCl and NaCl crystals have been studied at the molecular level by means of high-resolution electron microscopy. Both tetragonal and orthorhombic structures have been found. It is revealed that the interaction between substrates and molecules, the existence of geometric isomers, the anisotropy of molecular
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.