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Journal ArticleDOI

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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Journal ArticleDOI

Prediction of possible crystal structures for C-, H-, N-, O-, and F-containing organic compounds

TL;DR: The results are described from the analyses of several known compounds starting with the crystal molecular structures as the MOLPAK search probes in the P1, P21, P 21/c, and P212121 space groups, in which the search probes were created by AM1 geometry optimization of preliminary molecular models.
Book ChapterDOI

Molecular integrals Over Gaussian Basis Functions

TL;DR: In this paper, the authors focus on the efficient generation of integrals and their nth-derivatives, and show that the nth derivatives of the integrals are required to compute nth derivative of the energy.
Journal ArticleDOI

Soft drug design: general principles and recent applications.

TL;DR: An overview of the general soft drug design principles is presented and a variety of specific examples to illustrate the concepts are provided to systematize and summarize the related work done in a number of laboratories.
Journal ArticleDOI

Influence of donor and acceptor substituents on the electronic characteristics of poly(paraphenylene vinylene) and poly(paraphenylene)

TL;DR: In this article, the influence of substitution by various donor and acceptor groups onto the phenyl rings and/or the vinylene units of poly(paraphenylene vinylene) and poly(polyparaphhenylene) was investigated theoretically.
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