Spectroscopic studies on the photoeffects on some metallocenes in the presence of chloroform molecules confined in poly(methyl methacrylate) thin films

Photooxidation of Some Metallocenes in a Polymer Matrix

“…Changes in the electronic absorption spectra of metallocene-doped PMMA thin films containing chloroform molecules were studied as a function of time (duration) of photoexcitation [ 39 , 40 ]. For such studies, photoexcitation in the case of a particular metallocene was done by the radiation showing significant photoresponse for the particular material.…”

“…Dependence of the photoeffects on the amount of metallocene in the metallocene-doped PMMA films (containing chloroform molecules) was studied by using photoexcitation at a fixed wavelength and keeping all other parameters fixed [ 39 , 40 ]. In Figure 6 (a), the representative plots for the spectral changes with the amount of metallocene in the PMMA film (containing chloroform molecules) are shown in the case of acetylferrocene.…”

“…In the case of ferrocene and its other derivatives, saturation in the change in absorbance with increasing concentration was observed at higher values of concentration (as in Figure 6 (b)). However, in the case of ruthenocene, for the higher values of concentration (same range), no saturation in the change in absorbance was observed and a steady decrease in absorbance with increasing concentration was recorded [ 40 ].…”

“…The PMMA film acts as a matrix to hold on the sample and solvent molecules together in the solid phase. Recent studies in our laboratory [ 38 , 39 , 40 ] have shown that photoinduced charge-transfer occurs between metallocenes and chloroform molecules confined in PMMA thin films i.e. photooxidation of metallocenes in the presence of chloroform molecules is possible in the PMMA matrix.…”

Photoinduced anomalous current changes in some organometallic materials

“…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.…”