6007-86-9Relevant articles and documents
Thiophene donor - Acceptor [2]rotaxanes
Ikeda, Taichi,Higuchi, Masayoshi,Sato, Akira,Kurth, Dirk G.
, p. 2215 - 2218 (2008)
(Chemical Equation Presented) A series of the thiophene donor-acceptor [2]rotaxanes have been synthesized based on the inclusion complexes of cyclobis(paraquat-p-phenylene) (CBPQT4+) with thiophene, bithiophene, and terthiophene. The maximum wavelength of the charge-transfer band strongly depends on the number of thiophene units, while the association constant does not. These donor-acceptor pairs will be fascinating constituents for optoelectronic and electromechanical materials.
Synthesis, antimicrobial activity, and ion transportation investigation of four new [1 + 1] condensed furan and thiophene-based cycloheterophane amides
?zcan, Hafize,Erku?, Betül,Zaim, ?mer
, (2020)
Four new macrocyclic compounds with thiophene (L1 and L2) and furan (L3 and L4) rings were synthesized and characterized by IR, 1H NMR, 13C NMR, and Q-TOF spectral data. Macrocyclic amides (L1, L2, L3, and L4) were tested for ion transportation with Na+ and K+ ions, and also, antimicrobial activities were investigated against the Gram-negative Escherichia coli ATCC 25922, Gram-positive Staphylococcus aureus ATCC 25923, Gram-negative Listeria monocytogenes ATCC 19115, Gram-negative Salmonella typhimurium ATCC 14028, Bacillus cereus bacteria, and Candida albicans ATCC 10231 for all amides.
Synthesis and characterization of novel optically active polyarylene vinylenes with controlled effective conjugation length
Gomez,Segura,Martin
, p. 7501 - 7511 (2000)
New chiral and soluble binaphthyl derivatives (12 and 13) endowed with carboxaldehyde or cyanomethyl functional groups have been prepared as suitable building blocks for the synthesis by Knoevenagel condensation of a series of optically active block copolymers (1-7) with controlled effective conjugation length. A variety of functionalized co-monomers (14-19) have been prepared by different synthetic procedures to be used in further polymerization reactions with binaphthyl derivatives 12 and 13. Depending upon the nature of the co-monomers, it is possible to tune the wavelength of the new polymers, which is very close to that of the respective repeating units. Fluorescence measurements on polymers 1-3 reveal a strong blue-green emission with Stokes shifts of 74-107 nm. Theoretical calculations at the semiempirical AM-1 level have been carried out on model compounds, and the calculated torsion angles are in agreement with the electronic spectra data. Finally, the redox properties of the polymers prepared (1-7) were determined by cyclic voltammetry, and an amphoteric behavior with oxidation potentials ranging from 1.1 to 1.6 V and reduction potentials close to - 1.5 V was found.
Controlling the thermoelectric properties of thiophene-derived single-molecule junctions
Chang, William B.,Mai, Cheng-Kang,Kotiuga, Michele,Neaton, Jeffrey B.,Bazan, Guillermo C.,Segalman, Rachel A.
, p. 7229 - 7235 (2014)
Thermoelectrics are famously challenging to optimize, because of inverse coupling of the Seebeck coefficient and electrical conductivity, both of which control the thermoelectric power factor. Inorganic-organic interfaces provide a promising route for realization of the strong electrical and thermal asymmetries required for thermoelectrics. In this work, transport properties of inorganic-organic interfaces are probed and understood at the molecular scale using the STM-break junction measurement technique, theory, and a class of newly synthesized molecules. We synthesized a series of disubstituted thiophene derivatives varying the length of alkylthio-linkers and the number of thiophene rings. These molecules allow the systematic tuning of electronic resonances within the junction. We observed that these molecules have a decreasing Seebeck coefficient with increasing length of the alkyl chain, while oligothiophene junctions show an increasing Seebeck coefficient with length. We find that thiophene-Au junctions have significantly higher Seebeck coefficients, compared to benzenedithiol (in the range of 7-15 μV/K). A minimal tight-binding model, including a gateway state associated with the S-Au bond, captures and explains both trends. This work identifies S-Au gateway states as being important and potentially tunable features of junction electronic structure for enhancing the power factor of organic/inorganic interfaces.
Modular Synthesis of Diverse Natural Product-Like Macrocycles: Discovery of Hits with Antimycobacterial Activity
Dow, Mark,Marchetti, Francesco,Abrahams, Katherine A.,Vaz, Luis,Besra, Gurdyal S.,Warriner, Stuart,Nelson, Adam
supporting information, p. 7207 - 7211 (2017/05/31)
A modular synthetic approach was developed in which variation of the triplets of building blocks used enabled systematic variation of the macrocyclic scaffolds prepared. The approach was demonstrated in the synthesis of 17 diverse natural product-like macrocyclic scaffolds of varied (12–20-membered) ring size. The biological relevance of the chemical space explored was demonstrated through the discovery of a series of macrocycles with significant antimycobacterial activity.
