Hybrid Host Materials For Electrophosphorescent Devices
申请人:Chen Shaw H.
公开号:US20100184942A1
公开(公告)日:2010-07-22
Compounds (including polymers) for use in hybrid host materials which can be used in electroluminescent devices. The compounds comprise at least one electron-transporting moiety and at least one hole-transporting moiety which are joined by a flexible linker. Hybrid host materials comprising the compounds exhibit stability against phase separation, elevated glass transition temperature, morphological stability against crystallization, and isolation of the electron transporting moiety and hole transporting moiety π-systems.
A highly selectivecopper-catalyzed concise synthesis of 3,5-diarylpyridine and 2-(1H)-pyridone has been achieved through cascade Chichibabin-type cyclization, C(sp3)–C(sp3) cleavage, and aerobicoxidation. Azide, ceric ammonium nitrate (CAN), and 2-aminopyridine are disclosed as efficient nitrogen donors in this Cu-catalysis using O2 as the oxidant. Water and molecular oxygen were employed as the
Quantification of the Effect of Conformational Restriction on Supramolecular Effective Molarities
作者:Harry Adams、Elena Chekmeneva、Christopher A. Hunter、Maria Cristina Misuraca、Cristina Navarro、Simon M. Turega
DOI:10.1021/ja310221t
日期:2013.2.6
H-bonding interactions to the overall stability of the complexes. Measurement of association constants for the corresponding intermolecular H-bonding interactions allowed determination of the effectivemolarities (EM) for the intramolecular interactions. Comparison of ligands that feature amide H-bond acceptors and ester H-bonds at identical sites on the ligand framework show that the values of EM are
已在两种不同的溶剂、甲苯和 1,1,2,2-四氯乙烷 (TCE) 中测量了 96 个密切相关的锌卟啉-吡啶配体配合物的缔合常数。锌卟啉受体具有苯酚侧臂,可与吡啶配体上的酯或酰胺侧臂形成分子内H键。这些结合常数用于构建 64 个化学双突变循环,测量分子内 H 键相互作用对复合物整体稳定性的自由能贡献。测量相应分子间氢键相互作用的缔合常数可以确定分子内相互作用的有效摩尔浓度 (EM)。在配体框架上的相同位点具有酰胺 H 键受体和酯 H 键的配体的比较表明,EM 的值实际上是相同的。类似地,EM 值在甲苯和 TCE 中几乎相同。然而,比较两个扭转自由度不同的配体系列表明,柔性配体的 EM 值比相应的刚性配体低一个数量级。该观察结果适用于具有不同程度受体-配体互补性的一系列不同超分子结构,并表明通常在超分子复合物中冷冻转子的成本约为 5 kJ/mol。然而,比较两个扭转自由度不同的配体系列表明,柔性配体的
bond participation in annulation to pyridines usingN,N-dimethylformamide (DMF) as the N1 and C4 synthons has been carried out. In this reaction, DMF contributed one N atom and one C atom to two disconnected positions of pyridine ring, with no need for an additional nitrogen source. Two C═C bonds in two molecules of substituted styrenes offered four carbon atoms in the presence of iodine and persulfate