نتایج جستجو برای: halogen π
تعداد نتایج: 37828 فیلتر نتایج به سال:
Abstract Microplastics (MPs) are recognized as vectors for the transport of organic contaminants in aquatic environments addition to their own adverse effects on organisms. Per- and polyfluoroalkyl substances (PFASs) widely present due widespread applications, thus coexist with MPs. Therefore, we focus interaction MPs PFASs related combined toxicity this work. The adsorption is critically revie...
The study of two complexes fluorenonophane with CHCl3 and CHBr3 molecules has revealed that they differ mainly by the halogen bonds between host guest molecules. experimental theoretical quantum chemical shown strength a bond depends on nature atom as well its orientation to π-system. more positive electrostatic potential was at bromine indicating stronger participation confirmed interaction en...
MP2/aug'-cc-pVTZ calculations have been carried out to investigate the halogen-bonded complexes formed when CO and CS act as electron-pair donors through C to ClF, ClNC, ClCl, ClOH, ClCN, ClCCH, and ClNH₂. CO forms only complexes stabilized by traditional halogen bonds, and all ClY molecules form traditional halogen-bonded complexes with SC, except ClF which forms only an ion-pair complex. Ion-...
Novel chiral π–copper(II)−π complex catalyzed enantioselective α-chlorination and -bromination of N-acyl-3,5-dimethylpyrazoles are described. The complexation Cu(OTf)2 with 3-(2-naphthyl)-l-alanine-derived amides greatly increases the Lewis acidity triggers in situ generation enolate species without an external base, which has a suppressing effect for due to undesired halogen bonding. This stra...
The asymmetric introduction of functional groups into polymers is promising due to its potential provide novel electronic and magnetic properties. Though traditional on-surface bottom-up synthesis has succeeded in creating various types polymers, it struggles at realizing asymmetry the difficulty stereoregular polymerization tendency for overall polarity cancellation during agglomeration. Here,...
The title compound, C(8)H(6)INS, is essentially planar, the largest deviation from the mean plane being for the I atom [0.075 (3) Å]. The crystal structure is mainly stabilized by inter-molecular C-I⋯N halogen bonds, forming zigzag supra-molecular chains in [10]. Relatively short off-set π-π contacts [centroid-centroid distance = 3.758 (2) Å] between the thia-zole rings of inversion-related mol...
In the title compound, C10H4Br2O3, the atoms of the 6,8-di-bromo-chromone unit are essentially coplanar [largest deviation from the mean planes = 0.1109 (3) Å] and the formyl group is twisted slightly with respect to the attached ring [C-C-C-O torsion angles = 11.5 (4) and -168.9 (3)°]. In the crystal, mol-ecules are linked to each other through halogen bonds [Br⋯O = 3.118 (2) Å, C-Br⋯O = 162.3...
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