Rationalisation and visualisation of non-bonded interactions
نویسندگان
چکیده
Models of non-bonded interactions are crucial in structure-based drug design. “Standard” hydrogen bonds are well modelled through traditional molecular mechanics forcefields with their treatments of electrostatics, and functional forms, often based on abundant crystal structure data, to describe their geometries. But “non-standard” interactions for example, hydrogen bonds with carbon as the donor, or so-called halogen interactions are not well handled, or not handled at all. Here, we describe the use of extended Hückel (E-Hückel) theory, a very fast, low-level MO theory, to evaluate the geometries and energies of such non-standard interactions.
منابع مشابه
High-Level Quantum Chemical Calculations of Ozone-Water Complexes
The structural and energetic characteristics of O3–H2O complexes have been investigated by means of B3LYP, MP2, MP4(SDTQ), CCSD(T) and QCISD(T) methods in conjunction with the AUG-cc-pVDZ and AUG-cc-pVTZ basis sets. Six conformers were found for the O3–H2O complex. Two different intermolecular interactions were expected to participate in the formation of complexes, namely conventional O∙∙∙H hyd...
متن کاملCharacterization of intermolecular interaction between Cl2 and HX (X=F, Cl and Br): An ab initio, DFT, NBO and AIM study
The character of the intermolecular interactions in Cl2-HX (X =F, Cl and Br) complexes has been investigated by means of the second-order Möller–Plesset perturbation theory (MP2) and the density functional theory (DFT) calculations. The results show that there are two types of lowest interaction potential equilibrium structures in the interactions between Cl2 and HX: X∙∙∙Cl type geometry and hy...
متن کاملAn Investigation of Structural-Mechanical Properties of Spun-Bonded Non-Woven Using Computer Vision Method
متن کامل
Investigation of non-bonded interaction between C10H8 and B12N12 nano ring: NBO and NMR studies
To determine the non-bonded interaction energies between Naphthalene and B12N12 Nano ring in different orientations and distances, geometry of molecules with B3LYP method and 6-31g* basis set optimized. Also reactivity and stability of Naphthalene alone and in the presence B12N12 Nano ring checked. Then calculated the NBO, NMR, FREQ, NICS and muliken charge of Naphthalene atoms alone and in the...
متن کاملInvestigation of non-bonded interaction between C10H8 and B12N12 nano ring: NBO and NMR studies
To determine the non-bonded interaction energies between Naphthalene and B12N12 Nano ring in different orientations and distances, geometry of molecules with B3LYP method and 6-31g* basis set optimized. Also reactivity and stability of Naphthalene alone and in the presence B12N12 Nano ring checked. Then calculated the NBO, NMR, FREQ, NICS and muliken charge of Naphthalene atoms alone and in the...
متن کامل