Journal
WILEY INTERDISCIPLINARY REVIEWS-COMPUTATIONAL MOLECULAR SCIENCE
Volume 11, Issue 2, Pages -Publisher
WILEY
DOI: 10.1002/wcms.1493
Keywords
density functional tight-binding theory; multilevel quantum chemistry; semiempirical molecular orbital theory
Funding
- Deutsche Akademie der Naturforscher Leopoldina - Nationale Akademie der Wissenschaften [LPDS 2018-09]
- Deutsche Forschungsgemeinschaft [SPP 1807]
Ask authors/readers for more resources
This review discusses a family of atomistic, mostly quantum chemistry based semiempirical methods for describing large molecules in gas and condensed phase. These methods are derived from a density functional perturbation expansion and emphasize parameter availability for almost the entire periodic table, with improvements in atomic orbital basis set and interaction treatments. The methods are consistent with accurate gas phase theoretical reference data and have been extended for electronic spectra and response properties.
This review covers a family of atomistic, mostly quantum chemistry (QC) based semiempirical methods for the fast and reasonably accurate description of large molecules in gas and condensed phase. The theory is derived from a density functional (DFT) perturbation expansion of the electron density in fluctuation terms to various orders similar to the original density functional tight binding model. The term eXtended in their name (xTB) emphasizes the parameter availability for almost the entire periodic table of elements (Z <= 86) and improvements of the underlying theory regarding, for example, the atomic orbital basis set, the level of multipole approximation and the treatment of the important electrostatic and dispersion interactions. A common feature of most members is their consistent parameterization on accurate gas phase theoretical reference data for geometries, vibrational frequencies and noncovalent interactions, which are the primary properties of interest in typical applications to systems composed of up to a few thousand atoms. Further specialized versions were developed for the description of electronic spectra and corresponding response properties. Besides a provided common theoretical background with some important implementation details in the efficient and freextbprogram, various benchmarks for structural and thermochemical properties including (transition-)metal systems are discussed. The review is completed by recent extensions of the model to the force-field (FF) level as well as its application to solids under periodic boundary conditions. The general applicability together with the excellent cost-accuracy ratio and the high robustness make the xTB family of methods very attractive for various fields of computer-aided chemical research. This article is categorized under: Electronic Structure Theory > Ab Initio Electronic Structure Methods Electronic Structure Theory > Semiempirical Electronic Structure Methods Software > Quantum Chemistry
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available