Supramolecular Control for the Modular Synthesis of Pseudopeptidic Macrocycles through an Anion-Templated Reaction
作者:Ignacio Alfonso、Michael Bolte、Miriam Bru、M. Isabel Burguete、Santiago V. Luis、Jenifer Rubio
DOI:10.1021/ja710132c
日期:2008.5.1
tetraamine macrocycles. Accordingly, we have used this reaction to efficiently synthesize a family of new pseudopeptidic macrocycles in a one-pot two-steps anion-templated reductive amination reaction, which comprises a multicomponent macrocyclization through the selective formation of four chemical bonds to yield a unique macrocyclic structure. Different variables like the aliphatic spacer between amino
Evaluation of the binding ability of tetraaza[2]arene[2]triazine receptors anchoring l-alanine units for aromatic carboxylate anions
作者:Ana I. Vicente、João M. Caio、João Sardinha、Cristina Moiteiro、Rita Delgado、Vítor Félix
DOI:10.1016/j.tet.2011.10.090
日期:2012.1
The binding affinities of three new tetraaza[2]arene[2]triazine based macrocycles anchoring one (AC1A) and two (AC2A and Me4AC2A) l-alanine amino acid units for five aromatic carboxylateanions (bz−, ph2−, iph2−, tph2− and btc3−) were investigated in DMSO-d6. 1H NMR titrations revealed that the AC1A and AC2A receptors exhibit comparable anion affinities, suggesting that the two l-alanine binding units
Molecular Cursor Caliper: A Fluorescent Sensor for Dicarboxylate Dianions
作者:Wei Chen、Chenxing Guo、Qing He、Xiaodong Chi、Vincent M. Lynch、Zhiyun Zhang、Jianhua Su、He Tian、Jonathan L. Sessler
DOI:10.1021/jacs.9b07170
日期:2019.9.18
revealed that treating DPAC-bisC4P with dicarboxylate guests capable of forming pseudo-macrocyclic host-guest complexes via multiple hydrogen bonding interactions between the dicarboxylates and calix[4]pyrrole moieties, led to a blue-shift in the emission of the phenazine core. The binding-based fluorescence tuning features of DPAC-bisC4P allows the underlying binding events and inferred structural changes
Supramolecular chemistry of two new bis(1,2,3-triazolyl)pyridine macrocycles: metal complexation, self-assembly and anion binding
作者:Arthur H. G. David、Rosemary J. Goodwin、Nicholas G. White
DOI:10.1039/d2dt03985k
日期:——
and the btp triazole donors. The macrocycle was complexed with Pd(II) and the resulting complexes were shown to bind strongly to halide anions. The solid state structures of [Pd·8·X]BF4 (X = Cl−, Br−, I−) were investigated by X-ray crystallography, which showed that [Pd·8·Br] forms an unusual “chain of dimers” structure assembled by metalcomplexation, N–H⋯Br− hydrogen bonding and short Pd⋯Pd contacts
两个包含双 (1,2,3-三唑基) 吡啶 ( btp ) 基序的新大环化合物由btp二叠氮化物前体 ( 1 )以高产率制备。溶液1 H NMR 研究表明,该二叠氮化物与二价过渡金属离子发生自组装,形成带有叠氮侧基的 ML 2配合物,显然适合转化为金属模板链烷烃;然而,尝试形成这些链烷烃的尝试没有成功。相反,制备了一个包含两个btp基序的新大环,它在固态下形成纳米管结构。将叠氮基还原为胺,然后形成酰胺键,用于将1转化为大环8含有btp和间苯二胺功能。该大环化合物仅通过间苯二甲酰胺基序结合乙腈中的卤化物和草酸根阴离子,并通过间苯二甲酰胺酰胺供体和btp三唑供体与芳族二羧酸盐结合非常牢固。大环化合物与 Pd( II ) 络合,所得络合物显示与卤化物阴离子强烈结合。通过X射线晶体学研究了[Pd· 8 ·X]BF 4 (X = Cl − , Br − , I − )的固态结构,表明[Pd· 8 ·Br]形成了一条不寻常的“链”。
A silicon-containing film is formed from a heat curable composition comprising (A) a silicon-containing compound obtained by effecting hydrolytic condensation of a hydrolyzable silicon compound in the presence of an acid catalyst, and substantially removing the acid catalyst from the reaction mixture, (B) a hydroxide or organic acid salt of lithium, sodium, potassium, rubidium or cesium, or a sulfonium, iodonium or ammonium compound, (C) an organic acid, and (D) an organic solvent. The silicon-containing film allows an overlying photoresist film to be patterned effectively. The composition is effective in minimizing the occurrence of pattern defects after lithography and is shelf stable.