Electrochromic properties of some bis‐chalcone derivatives‐based nanofibers

Abstract

Two bis-chalcone derivatives, (2E,6E)-2,6-bis[(thiophen-2-yl)methylene]cyclohexanone (C1) and (2E,6E)-2,6-bis[(furan-2yl)methylene]cyclohexanone (C2)-based electrochromic (EC) nanofibers were produced in the presence of poly(methyl methacrylate) (PMMA) as supporting polymer using the electrospinning technique. The scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy were used to examine morphology and chemical compositions of nanofibers before and after stability test. SEM images of the obtained smooth and bead-free nanofibers before the stability test showed that both bis-chalcone derivatives were homogeneously dispersed on the surface of the electrospun nanofibers. Nanofibers of bis-chalcone derivatives were characterized with Fourier-transform infrared spectroscopy. The electrochemical and EC properties of these bis-chalcone derivatives were investigated. The C1-PMMA nanofiber-based electrochromic device (ECD) showed higher DT max (41.47%) than that of the C2-PMMA nanofiberbased ECD (4.67%) during coloration/bleaching at 715 nm. The switching times for coloration and bleaching of C1-PMMA nanofiber-based ECD were found to be 4.42 and 1.12 s, respectively, and the coloration efficiency was 136.18 cm 2 /C. Repeated cyclic voltammograms and 1000 cycles of chronoamperometric measurements of the bis-chalcone derivatives indicated that ECDs have long-term redox stability.

Bis-Kalkon Türevlerinin Elektrokimyasal Davranışlarının İncelenmesi

“…This redox process showed that the electrochemical behaviors of P1 and P2 are reversible up to 200 mV/s. In addition, for both examples, the linearity of the plots shows that the electrochemical process can be controlled by the diffusion step at scan rates lower than 200 mV/s (Erasmus, 2011;Yellepa and Mallapa, 2015;Nohut Maşlakcı et al, 2018).…”

“…In addition to biological activities, the photophysical properties of chalcone derivatives have received much attention in studies such as nonlinear optics (NLO), photorefractive polymers, fluorescent probes for the detection of metal ions and organic luminescent as well as semiconducting device applications (Fayed, 2006;Wei et al, 2011;Si et al, 2011;Teo et al, 2017;Kwong et al, 2017;Karuppusamy et al, 2017;Nohut Maşlakcı et al, 2018). Also, bis-chalcones are an interesting class of compounds because of their use as precursors to potentially bioactive and functional compounds (Xu et al, 2001;Bukhari et al, 2013;Ritter et al, 2014;Albuquerque et al, 2014;Tala-Tapeh et al, 2015).…”

Electrospun nanofibers fromferrocene‐containingmultiblock copolymers prepared viaRAFTpolymerization withF127modified precursor

“…The previous studies showed that a higher applied voltage increased the net charge experienced by the jet, resulting in enhanced fiber drawing to narrow diameters 39 . Meanwhile, the solvent volatilized quickly in electrospun processing, the appropriate parameters of polymer concentration, applied potential and, working distance are critical factors for optimized nanofibers 39,55 . SEM results for the nanofibers produced from multi‐block copolymers solution are shown in Figure 7.…”

Exploration of Some Bis‐Sulfide and Bis‐Sulfone Derivatives as Non‐Classical Aldose Reductase İnhibitors

“…We used bis‐chalcone derivatives in the synthesis of these compounds (Scheme 1). Bis‐chalcones were synthesized according to our procedure by the condensation of cyclohexanone with aromatic aldehydes [75] . By reacting 1,4‐Michael addition of bis‐chalcones with thiophenol, we were able to synthesize bis‐sulfides ( 5 a – i ) using our previous methods [56] .…”

“…Bischalcones were synthesized according to our procedure by the condensation of cyclohexanone with aromatic aldehydes. [75] By reacting 1,4-Michael addition of bis-chalcones with thiophenol, we were able to synthesize bis-sulfides (5 a-i) using our previous methods. [56] At room temperature and under straightforward reaction conditions, bis-sulfides (5 a-i) were changed into bissulfones (6 a-i) by the employment of the oxidant meta-chloroperbenzoic acid (m-CPBA) (Scheme 1).…”