Photoinduced charge-transfer between ferrocene derivatives and chloroform molecules confined in poly(methyl methacrylate) thin films

Novel Miscible Blends Composed of Poly(Methyl Methacrylate) and 2,2-Bis(3,4-Carboxyphenyl)Hexafluoropropane Dianhydride-Based Polyimides with Optical Grade Clarity

“…1) PMMA has excellent clarity with high rigidity and toughness as a homopolymer, though deficient characteristics of PMMA such as low impact strength, poor radiation, thermal stability, and solvent resistance deter its application in some areas. [1][2][3][4][5] There has been great interest in polymer blends for quite some time, as polymer blending is a fast and economical way of improving the properties of commercially available polymers without the laborious development of new polymers. [6][7][8][9][10] However, the physical properties of the newly developed polymer blends are strongly dependent upon the phase miscibility.…”

“…23,24) This work examines blends of PMMA with 6FDA-based polyimides to develop miscible blends that overcome the drawbacks of PMMA and have optical-grade clarity. [4][5][6][7] The miscibility of polymer blends is often judged from specimens prepared by melt blending or solution casting methods. However, an inappropriate choice in temperature or solvent may lead to an erroneous judgment about miscibility due to phase separation resulting from LCST type phase behavior,…”

Photooxidation and Photoconductivity of Polyferrocenylsilane Thin Films

“…[22] The charge-transfer to solvent between ferrocenes and CHCl 3 in a PMMA matrix has also been investigated, and photogeneration of the ferrocenium cation was observed. [23,24] The resulting composite material was reported to exhibit photoconductivity. [25] Because of our interest in the electrical properties of ferrocene-containing polymers, we have explored the potential of photooxidation of PFS in the presence of CHCl 3 .…”

Photoinduced anomalous current changes in some organometallic materials

“…Fc(CHO) (secondary r-constant r p ) are reported to be 0.45, 0.502 and 0.522, respectively [14]. The observed results show that the values of E d and E ph (evaluated corresponding to 70 s light exposure and in the temperature range lower than the temperature for photoinduced phase transition) increase with the increase of r p of the substituents in the FcH derivatives.…”

“…Ferrocene and some of its derivatives have wide applications in various fields e.g., these materials have been used (i) efficiently as mediators in various electron transfer processes [2], (ii) in the development of biosensors [2], (iii) for the synthesis [5] of new materials of higher electrical conductivity from poly(vinylidene chloride) and (iv) for the preparation of charge transfer compounds with organic solids [4,6]. Previous studies [7][8][9][10][11][12][13][14][15][16][17] in our laboratory, on the dark conductivity [7][8][9][10] and photoconductivity [11][12][13]17] as well as spectroscopic properties [14,15] (of ferrocene, its some derivatives and few other metallocenes) under various experimental conditions have offered some interesting results. The results include adsorption-induced phase transition [7,8] in ferrocene and its some derivatives upon adsorption of organic solvent vapours; current oscillations in the vapouradsorbed state [9,10]; photoinduced charge transfer [14,15] between a metallocene (ferrocene, its derivatives or other metallocene) and chloroform molecules confined in a poly(methyl methacrylate) (PMMA) thin film; observation of fluctuations in absorbance for ferrocene-doped PMMA thin films containing chloroform molecules after photoexcitation [16]; photoswitching property [17] of ferrocene-doped PMMA thin films, etc.…”