Beyaz

Taha Toros Arşivi, Dosya No: 3-Ziya Osman SabaUnutma İstanbul projesi İstanbul Kalkınma Ajansı'nın 2016 yılı "Yenilikçi ve Yaratıcı İstanbul Mali Destek Programı" kapsamında desteklenmiştir. Proje No: TR10/16/YNY/010

Effects of Photochromic Furan-Based Diarylethenes on Gold Nanoparticles Aggregation

Abstract The photochromic properties of furan-based diarylethenes and their interaction with citrate-capped gold nanoparticles were investigated by ultraviolet/visible absorption spectroscopy and transmission electron microscopy. We identified the optimal concentration of diarylethenes in water-ethanol mixture required for stability of colloidal systems. Nanoparticles coupled with diarylethene derivatives exhibit a new surface plasmon resonance band coming from their aggregation. We analyzed the effects of functional side-chain groups on aggregation process. These results can be considered as a basis for further designing of novel hybrid nanomaterials and optoelectronic elements

Additional file 1: Figure S1. of Effects of Photochromic Furan-Based Diarylethenes on Gold Nanoparticles Aggregation

The color changes that represents the interection of DAEs with AuNPs: (a) C5F-MTSC and (b) C5F-TSC. The volume ratio water to ethanol is equal to 4:1, C DAE = 1 × 10−6, 5 × 10−6, 1 × 10−5 mol·L−1. The concentration of gold C Au = 2 × 10−4 mol·L−1 was constant for all series. The spectra of the corresponding solutions are presented in Fig. 3. (PPT 128 kb

Additional file 4: Figure S4. of Effects of Photochromic Furan-Based Diarylethenes on Gold Nanoparticles Aggregation

The spatial structures of C5F-MTSC (top) and C5F-TSC (bottom) in open-ring (left) and closed-ring (right) states obtained with ChemDraw MM2 energy minimization. (PPT 219 kb

Picosecond cyclization reaction dynamics of furan-based diarylethene with thiosemicarbazone side-chain groups

Picosecond cyclization reaction dynamics of furan-based photochromic diarylethenes with thiosemicarbazone side-chains were studied by femtosecond transient absorption spectroscopy. The monitored ring-closing reaction in the time range of 0÷1100 ps is characterized by two main stages. First stage proceeds during the first 1.1 ps and is associated mainly with redistribution of π-π molecular orbitals of excited open-ring molecules which consequently leads to the formation of excited closed-ring molecules. During the next 300 ps, a long-term relaxation via vibrational cooling of closed-ring form occurs. The obtained relaxation dynamics curve was fitted by an exponential decay function with 68 ps time constant.publishe

Ultrafast ring-closing reaction dynamics of a photochromic furan-based difurylethene

The ultrafast photoinduced ring-closing dynamics of a furan-based difurylethene (YnPhT) has been investigated by femtosecond transient absorption spectroscopy. We performed time-dependent density functional theory (TD-DFT) calculations to explain the experimental results in detail. The sub-picosecond time scale of the ring-closing reaction is comparable with thiophene-based analogues, but oxygen atoms at the photochromic core can avoid adverse interaction between switches and metal contacts in further applications. This observation proves that furan-based diarylethenes are potential optoelectronic elements with an ultrafast optical response.publishe