Spectroscopic and Electrochemical Characterizations of Dilithium Octacyanophthalocyanine Langmuir−Blodgett Films

Abstract

Langmuir−Blodgett (LB) films of dilithium octacyanophthalocyanine [Li2Pc(CN)8] were first prepared, and their electrochemical reduction/reoxidation behaviors were studied in detail. An overwhelming majority of the Li2Pc(CN)8 molecules in the LB film were stacked in a face-to-face aggregated state and stood obliquely with an edge-on configuration on the substrate surface. Two overlapping redox waves were observed in the voltammogram of the LB film in 1 mol dm-3 HCl solution. Their relative intensity was found to be largely dependent on the molecular aggregation state in the film. On the basis of spectroscopic and electrochemical analyses, the first and second reduction waves upon cathodic potential scanning were principally assigned to the aggregated and monomeric Li2Pc(CN)8 molecules, respectively, in the solid film structure. In comparison with the corresponding solvent-cast film, charge transfer within the LB film and/or through the electrode interface was facilitated, and the LB film showed excellent dynamic character in the redox process.

Characterisation of Langmuir–Blodgett films of new multinuclear copper and zinc phthalocyanines and their sensing properties to volatile organic vapours

“…7. These results are in good agreement with ones obtained for a novel amphiphilic phthalocyanine, 1,4-di(hydroxyethoxy)-9,10,16,17,23,24-hexapentyloxyphthalocyanine LB films [31] as well as those for LB films of dilithium octacyanophthalocyanine derivative with eight strong electron-withdrawing groups [4].…”

“…This extraordinary versatility makes the Pc and MPc materials as attractive candidates for a wide range of potential applications such as photovoltaic cells, molecular metals, chemical sensors, nonlinear optics, and electrochromic display devices [4][5][6][7]. MPcs have attracted interest for gas sensing applications because of their high chemical and thermal stability, their ability to be deposited as thin layers, and their high intrinsic conductivity [8,9].…”

Characterization of Langmuir and Langmuir–Blodgett films of a thiomacrocyclic ionophore by surface pressure and AFM

“…The formation of monolayer films has been reported previously for macrocyclic compounds [1, 6-9, 15, 16] even though, depending on the subphase, the substrate and the specific structure of the compound, multilayer formation has also been observed [17][18][19]. Armstrong et al [17][18][19] proposed a bilayer for cooper phthalocyanine derivatives, but observed a clear transition in the isotherm that is not our case.…”

“…Armstrong et al [17][18][19] proposed a bilayer for cooper phthalocyanine derivatives, but observed a clear transition in the isotherm that is not our case. Jiao and Liu [20] reported the formation of monolayers or multilayers in naphthylidenecontaining Schiff base derivatives, depending on the compound structure.…”

Arrangement of tris(phthalocyaninato) gadolinium triple-decker complexes with multi-octyloxy groups on water surface

“…Following the Yoneyama equation [54][55][56], the orientation angles of phthalocyanine ring in triple-decker molecules with respect to the substrate in the films of 1-5 are calculated and organized in Table 2. It is worth noting that the orientation angle of phthalocyanine ring for 1 in pure film cannot be obtained due to the very poor transfer ratio of the monolayer and the bad quality of the deposited LB film.…”