Synthesis and structural features of sulfur-substituted calix[4]pyrrole for a bottom-up control of the substrate-directed self-assembly of supramolecular structures
摘要:
The synthesis of six new calix[4]pyrroles, containing sulfur-substituted phenylene units is reported. Halogen-anions and organic aromatic mono- and bis-anions have been selected to explore the formation of host-guest complexes and the possible self-assembly of multi-component structures with the six calixpyrroles. The type of aryl substitution modulates the strength of binding and the selectivity towards different anions and, in some cases, the combination of receptors and bis-anionic precursors, offers a way to build systems in which capsular assemblies are observed. (C) 2011 Elsevier Ltd. All rights reserved.
Synthesis and structural features of sulfur-substituted calix[4]pyrrole for a bottom-up control of the substrate-directed self-assembly of supramolecular structures
摘要:
The synthesis of six new calix[4]pyrroles, containing sulfur-substituted phenylene units is reported. Halogen-anions and organic aromatic mono- and bis-anions have been selected to explore the formation of host-guest complexes and the possible self-assembly of multi-component structures with the six calixpyrroles. The type of aryl substitution modulates the strength of binding and the selectivity towards different anions and, in some cases, the combination of receptors and bis-anionic precursors, offers a way to build systems in which capsular assemblies are observed. (C) 2011 Elsevier Ltd. All rights reserved.
An efficientmethod is reported to synthesize sulfonamides on DNA from sulfinic acids or sodium sulfinates and amines in the presence of iodine under mild conditions. This method demonstrates a major expansion of scope of sulfonamide formation on DNA through the utilization of a novel sodium carbonate-sodium sulfinate bifunctional reagent class.
are generally photocatalyzed by noble metal complexes. Low-cost and easy-to-prepare carbon dots (CDs) are attractive quasi-homogeneous photocatalyst alternatives, but their applicability is limited by their short photoluminescence (PL) lifetimes. By tuning the surface and PL properties of CDs, we designed colloidal CD nano-photocatalysts for a broad range of Ni-mediated cross-couplings between aryl
光氧化还原介导的镍催化交叉偶联是形成碳-杂原子键的强大转化,通常由贵金属络合物光催化。低成本且易于制备的碳点 (CD) 是极具吸引力的准均相光催化剂替代品,但它们的适用性受到光致发光 (PL) 寿命短的限制。通过调整 CD 的表面和 PL 特性,我们设计了胶体 CD 纳米光催化剂,用于芳基卤化物和亲核试剂之间广泛的 Ni 介导的交叉偶联。特别是,装饰有氨基的 CD 允许在温和、无碱的条件下与各种芳基卤化物和硫醇偶联。机理研究表明 Ni 助催化剂对 CD 激发态进行了动态猝灭,并确定了碘化吡啶 (pyHI),
Synthesis and structural features of sulfur-substituted calix[4]pyrrole for a bottom-up control of the substrate-directed self-assembly of supramolecular structures
作者:Anna Barattucci、Paola Bonaccorsi、Grazia Cafeo、Franz H. Kohnke、Teresa Papalia
DOI:10.1016/j.tet.2011.07.082
日期:2011.9
The synthesis of six new calix[4]pyrroles, containing sulfur-substituted phenylene units is reported. Halogen-anions and organic aromatic mono- and bis-anions have been selected to explore the formation of host-guest complexes and the possible self-assembly of multi-component structures with the six calixpyrroles. The type of aryl substitution modulates the strength of binding and the selectivity towards different anions and, in some cases, the combination of receptors and bis-anionic precursors, offers a way to build systems in which capsular assemblies are observed. (C) 2011 Elsevier Ltd. All rights reserved.