381666-12-2Relevant academic research and scientific papers
Direct-Bandgap 2D Silver-Bismuth Iodide Double Perovskite: The Structure-Directing Influence of an Oligothiophene Spacer Cation
Jana, Manoj K.,Janke, Svenja M.,Dirkes, David J.,Dovletgeldi, Seyitliyev,Liu, Chi,Qin, Xixi,Gundogdu, Kenan,You, Wei,Blum, Volker,Mitzi, David B.
, p. 7955 - 7964 (2019)
Three-dimensional (3D) hybrid organic-inorganic lead halide perovskites (HOIPs) feature remarkable optoelectronic properties for solar energy conversion but suffer from long-standing issues of environmental stability and lead toxicity. Associated two-dimensional (2D) analogues are garnering increasing interest due to superior chemical stability, structural diversity, and broader property tunability. Toward lead-free 2D HOIPs, double perovskites (DPs) with mixed-valent dual metals are attractive. Translation of mixed-metal DPs to iodides, with their prospectively lower bandgaps, represents an important target for semiconducting halide perovskites, but has so far proven inaccessible using traditional spacer cations due to either intrinsic instability or formation of competing non-perovskite phases. Here, we demonstrate the first example of a 2D Ag-Bi iodide DP with a direct bandgap of 2.00(2) eV, templated by a layer of bifunctionalized oligothiophene cations, i.e., (bis-aminoethyl)bithiophene, through a collective influence of aromatic interactions, hydrogen bonding, bidentate tethering, and structural rigidity. Hybrid density functional theory calculations for the new material reveal a direct bandgap, consistent with the experimental value, and relatively flat band edges derived principally from Ag-d/I-p (valence band) and Bi-p/I-p (conduction band) states. This work opens up new avenues for exploring specifically designed organic cations to stabilize otherwise inaccessible 2D HOIPs with potential applications for optoelectronics.
Regiospecific synthesis of 5-halo-substituted thiophene pyridyl thiourea compounds as non-nucleoside inhibitors of HIV-1 reverse transcriptase
Venkatachalam,Uckun
, p. 2451 - 2461 (2004)
The regiospecific synthesis of 5-halothiophenethylamines and halo-substituted phenylethyl thioureas was accomplished with an overall yield of 45-60%. Condensation of t-boc protected 2-thiophenethylamine with N-halo succinamide in dimethylformamide furnished the desired halo-substituted thiophenethylamines. These thiophenethyl amines were further converted into biologically active thiourea compounds using thiocarbonyldiimidazole chemistry. Several of the halo-substituted thiophene pyridyl thiourea compounds inhibited HIV-1 reverse transcriptase (RT) at nanomolar concentrations.
A selenophene-containing conjugated organic ligand for two-dimensional halide perovskites
Wei, Zitang,Wang, Kang,Zhao, Wenchao,Gao, Yao,Hu, Qixuan,Chen, Ke,Dou, Letian
supporting information, p. 11469 - 11472 (2021/11/12)
A selenophene-containing conjugated organic ligand, 2-(4′-methyl-5′-(5-(3-methylthiophen-2-yl)selenophen-2-yl)-[2,2′-bithiophen]-5-yl)ethan-1-aminium (STm), was synthesized and incorporated into a Sn(ii)-based two-dimensional perovskite, (STm)2SnI4. The band offset between the perovskite and ligand can be fine-tuned by introducing the STm ligand. Both field-effect transistor and light-emitting diode devices based on (STm)2SnI4films exhibit high performance and enhanced operational stability.
Two-Dimensional Halide Perovskite Materials
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Paragraph 0144-0145, (2021/11/05)
The present disclosure relates to novel two-dimensional halide perovskite materials, and the method of making and using the two-dimensional halide perovskite materials.
THIOPHENE MONOAMINE BASED ORGANIC-INORGANIC HYBRID PEROVSKITES
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Paragraph 0071; 0082; 0083, (2020/03/09)
The present disclosure relates to novel thiophene monoamine based organic-inorganic hybrid perovskites, and the method of making and using the novel organic-inorganic hybrid perovskites.
THERAPEUTIC AGENT FOR CEREBRAL INFARCTION
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, (2012/08/08)
The invention provides a therapeutic drug for ischemic stroke. The therapeutic drug has the formula (I) wherein each symbol is as defined herein, or a pharmacologically acceptable salt thereof, or a solvate thereof, as an active ingredient.
Self-assembly and semiconductivity of an oligothiophene supergelator
Pratihar, Pampa,Ghosh, Suhrit,Stepanenko, Vladimir,Patwardhan, Sameer,Grozema, Ferdinand C.,Siebbeles, Laurens D.A.,Wuerthner, Frank
experimental part, p. 1070 - 1078 (2011/03/22)
A bis(trialkoxybenzamide)-functionalized quaterthiophene derivative was synthesized and its self-assembly properties in solution were studied. In non-polar solvents such as cyclohexane, this quaterthiophene π-system formed fibril aggregates with an H-type
Regiospecific synthesis, X-ray crystal structure and biological activities of 5-bromothiophenethyl thioureas
Venkatachalam, Taracad K,Sudbeck, Elise A,Uckun, Fatih M
, p. 6629 - 6632 (2007/10/03)
The regiospecific synthesis of 5-bromothiophenethyl thioureas was accomplished in four steps with an overall yield of 40-60%. The requisite regioselectivity for bromination of the thiophene ring was achieved using bromine in acetic acid at low temperatures. The resulting 5-bromothiophenethylamine hydrobromide is an important precursor for the preparation of substituted thioureas. The X-ray crystal structure demonstrates that the bromine atom is indeed located at the 5-position of the thiophene ring.
