نتایج جستجو برای: type ii halogenhalogen contacts are halogen bonds
تعداد نتایج: 6157948 فیلتر نتایج به سال:
To assess whether there are universal rules that govern amino acid-base recognition, we investigate hydrogen bonds, van der Waals contacts and water-mediated bonds in 129 protein-DNA complex structures. DNA-backbone interactions are the most numerous, providing stability rather than specificity. For base interactions, there are significant base-amino acid type correlations, which can be rationa...
The synthesis and X-ray diffraction analysis of a new acidic salt, [4-methyl-phenyl ammonium][(O-phenyl)(hydroxyl)phosphate], [4-CH3-C6H4NH3][(C6H5O)P(O)(O)(OH)], is reported. This compound crystallizes in the monoclinic system, with space group P21/c (a = 9.5147(4) Å, b = 23.2158(10) Å, c = 13.2740(6) Å and b = 111.244(4)°) with four independent components including two cations and two anions...
Type I and II halogen bonds are well-recognized motifs that commonly occur within crystals. Quantum calculations applied to examine whether such geometries might in their closely related chalcogen bond cousins. Homodimers constructed of the R1R2C=Y R1R2Y monomers, wherein Y represents a atom, S, Se, or Te; R1 R2 refer either H F. A (T2) geometry lone pair one is aligned with σ-hole its partner ...
Halogen bonding (XB) has been extensively described in the context of a variety of self-assembled supramolecular materials with specific structural properties. However, it has so far received only little recognition for its possible role in the stabilization of the interactions between small chemicals and large biomolecules. Here, we provide three examples of halogen bonding occurring between s...
in this thesis, phosphorus ylides [phbppy], [no2bppy] and [brbppy] have been synthesized through the formation of phosphonium salt and dihydrogenation, followed by the reaction of pd(oac)2 and the orthopalladated dinuclear complexes [pd(?-cl)(phbppy)]2, [pd(?-cl)(no2bppy)]2 and [pd(?-cl)(brbppy)]2 have been produced. the reaction of dinuclear complexes and bidentate ligands [l = bipy (2,2-bipyr...
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