1040730-58-2Relevant academic research and scientific papers
Molecular bridging agent and preparation method and application thereof in Raman probe
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, (2016/10/17)
The invention relates to a molecular bridging agent and a preparation method and an application thereof in a Raman probe. The molecular bridging agent has a chemical name of bisacetic acid-4-ethinyl thiophenol ester, and has the following structural formu
Single-molecule conductance of functionalized oligoynes: Length dependence and junction evolution
Moreno-Garcia, Pavel,Gulcur, Murat,Manrique, David Zsolt,Pope, Thomas,Hong, Wenjing,Kaliginedi, Veerabhadrarao,Huang, Cancan,Batsanov, Andrei S.,Bryce, Martin R.,Lambert, Colin,Wandlowski, Thomas
supporting information, p. 12228 - 12240 (2013/09/23)
We report a combined experimental and theoretical investigation of the length dependence and anchor group dependence of the electrical conductance of a series of oligoyne molecular wires in single-molecule junctions with gold contacts. Experimentally, we focus on the synthesis and properties of diaryloligoynes with n = 1, 2, and 4 triple bonds and the anchor dihydrobenzo[b]thiophene (BT). For comparison, we also explored the aurophilic anchor group cyano (CN), amino (NH2), thiol (SH), and 4-pyridyl (PY). Scanning tunneling microscopy break junction (STM-BJ) and mechanically controllable break junction (MCBJ) techniques are employed to investigate single-molecule conductance characteristics. The BT moiety is superior as compared to traditional anchoring groups investigated so far. BT-terminated oligoynes display a 100% probability of junction formation and possess conductance values which are the highest of the oligoynes studied and, moreover, are higher than other conjugated molecular wires of similar length. Density functional theory (DFT)-based calculations are reported for oligoynes with n = 1-4 triple bonds. Complete conductance traces and conductance distributions are computed for each family of molecules. The sliding of the anchor groups leads to oscillations in both the electrical conductance and the binding energies of the studied molecular wires. In agreement with experimental results, BT-terminated oligoynes are predicted to have a high electrical conductance. The experimental attenuation constants βH range between 1.7 nm-1 (CN) and 3.2 nm-1 (SH) and show the following trend: β H(CN) H(NH2) H(BT) H(PY) ≈ βH(SH). DFT-based calculations yield lower values, which range between 0.4 nm -1 (CN) and 2.2 nm-1 (PY).
Preparation of linear aromatic disulfonic acids: New linker molecules for metal-organic frameworks
Muesmann, Thomas W.T.,Wickleder, Mathias S.,Christoffers, Jens
experimental part, p. 2775 - 2780 (2011/10/31)
Four linear aromatic disulfonic acids were prepared, which are structurally similar to dicarboxylic acids commonly used as linker molecules for metal-organic frameworks. 4,4-Biphenyldisulfonic acid was prepared in three steps from 4,4-dibromobiphenyl (54% overall yield). Direct sulfonation of terphenyl gave the respective all-para-constituted disulfonic acid in 73% yield. Tolane-4,4-disulfonic acid was obtained by a three-step sequence consisting of Sonogashira coupling, oxidative degradation of a thioester, and hydrolysis in 20% overall yield. By using a Glaser coupling, the bis(4-sulfophenyl)butadiyne was analogously prepared in 30% overall yield. Georg Thieme Verlag Stuttgart - New York.
