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Development and use of quantum mechanical molecular models. 76. AM1: a new general purpose quantum mechanical molecular model

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TLDR
In this paper, a new parametric quantum mechanical molecular model, AM1 (Austin Model l), based on the NDDO approximation, is described, in which the major weaknesses of MNDO, in particular failure to reproduce hydrogen bonds, have been overcome without any increase in computing time.
Abstract
A new parametric quantum mechanical molecular model, AM1 (Austin Model l), based on the NDDO approximation, is described. In it the major weaknesses of MNDO, in particular failure to reproduce hydrogen bonds, have been overcome without any increase in computing time. Results for 167 molecules are reported. Parameters are currently available for C, H, 0, and N.

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Empirically corrected dft and semi-empirical methods for non-bonding interactions

TL;DR: The accuracy of empirically-corrected density functional theory (DFT-D) and empirically -corrected semiempirical (SE- D) methods are reviewed here and the ability to reproduce benchmark energies and geometries is considered.
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Parametrized model for aqueous free energies of solvation using geometry-dependent atomic surface tensions with implicit electrostatics

TL;DR: In this article, a new model for predicting aqueous free energies of solvation based entirely on geometry-dependent atomic surface tensions is presented. But the model is especially suited for rapid estimations on large scales.
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Triplet state absorption in carbon nanotubes: a TD-DFT study.

TL;DR: Striking similarity of the electronic features between CNTs and pi-conjugated polymers are demonstrated and explicit guidelines for spectroscopic detection of CNT triplet states are provided.
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Thermally rearranged polybenzoxazoles membranes with biphenyl moieties: Monomer isomeric effect

TL;DR: In this article, a nucleophilic monomer (3,3′-diamino-4,4-dihydroxybenzidine, m HAB) was synthesized in good yield and high purity by a two-step synthesis, and the relationship between the thermal treatment employed and the degree of conversion to polybenzoxazole (PBO) was found.
Journal ArticleDOI

Combined DFT theoretical calculation and solid-state NMR studies of Al substitution and acid sites in zeolite MCM-22.

TL;DR: The DFT theoretical and NMR experimental results suggest that the acid strength of the three Brönsted acid sites in H-MCM-22 zeolite is slightly lower than that of H-ZSM-5Zeolite, with the Al1-OH-Si2 site having the strongest acid strength (as probed by TMPO).
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