75867-39-9Relevant articles and documents
Photogenerated charge collection on diamond electrodes with covalently linked chromophore monolayers
Artemenko, A.,Cermák, J.,Haenen, K.,Kavan, L.,Kromka, A.,Krysova, H.,Lopez-Carballeira, D.,Maes, W.,Nicley, S. S.,Raymakers, J.,Rezek, B.,Verstraeten, F.
, (2020)
Encouraged by its rich surface chemistry and excellent electrochemical properties, boron-doped nanocrystalline diamond (B:NCD) is a promising p-type photoelectrode in dye-sensitized solar cells. One method of diamond surface functionalization using stable carbon-carbon bonds involves the electrochemical grafting of diazonium salts. However, this method typically leads to multilayers that may complicate the transport of photogenerated charges. Here, we establish functionalization of B:NCD electrodes by a monolayer of ethynylphenyl molecules using sterically hindered 4-(trimethylsilyl)ethynylbenzenediazonium tetrafluoroborate. Both the density and structural orientation of the grafted layer are investigated by angular resolved X-ray photoelectron spectroscopy, confirming the presence of covalently grafted monolayers. After removal of the trimethylsilyl protective groups, the resulting ethynyl functionalities are employed to immobilize organic donor-acceptor chromophores via Sonogashira cross-coupling reactions. Homogenous surface coverage is achieved even on the B:NCD electrode. Atomic scale DFT computing reveals that for the chromophore with the strongest acceptor unit, efficient charge separation of 20 ? is obtained where photogenerated holes move directly into diamond. Yet, photocurrent and photovoltage measurements suggest competitive electron recombination to the diamond electrode via the redox electrolyte. Correlation between the density of the molecular layer and photocurrents/photovoltage provides better understanding of the charge generation and recombination pathways in diamond-organic photoelectrochemical cells.
Liquid crystal compound containing butadiyne structure and liquid crystal composition and application thereof
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Paragraph 0103; 0115-0117, (2021/05/08)
The invention relates to a liquid crystal compound containing a butadiyne structure. The liquid crystal compound is represented by a general formula I. The invention also relates to a liquid crystal composition which at least comprises the compound repres
Synthesis and photophysical properties of multilayer emitting π-p-π fluorophores
Wang, Xiaorong,Zhao, Sanxiao,Chen, Yin,Wang, Jingang
, (2019/11/02)
Fluorescence is widely used in biology, medicine, and analytical chemistry. The anthracene framework has received considerable attention for the luminescent molecular design as an attractive building unit. Herein, Luminescent “π-p-π” anthracene crystals with different multilayer stacking modes were conducted by experimental methods and theoretical calculations. It was found that “these anthracene derivatives showed strong fluorescence and stability in both solution and solid-state; A face-to-face π-π stacking arrangement dominated in N9,N10-diphenyl-2,6-bis((trimethylsilyl)ethynyl)anthracene-9,10-diamine (4), while C/N–H … π interactions were observed in the crystal lattice of 2,6-diethynyl-N9,N10-diphenylanthracene-9,10-diamine (5); The excitation processes of S0→S1 of 4 and 5 belonged to Localized Excitation; The number of photons emitted could be nearly equal to the number of photons absorbed below 120K”. This study is expected to assist in the design of photonic materials in the field of optical chemistry.
