The entropic penalty for associative reactions and their physical treatment during routine computations DOI
Jama Ariai, Urs Gellrich

Physical Chemistry Chemical Physics, Год журнала: 2023, Номер 25(20), С. 14005 - 14015

Опубликована: Янв. 1, 2023

A systematic study of the entropic penalty for associative reactions is presented. It shown that computed solution-phase Gibbs free energies typically overestimate contributions. This in solution, i.e., if number particles decreases along reaction coordinate (sum stoichiometric numbers ), originates from insufficient treatment effects by implicit solvent models. We propose an additive correction scheme to suitable routine applications non-expert users. based on Garza's formalism entropy [A. J. Garza, Chem. Theory Comput., 2019, 15, 3204.] physically sound and embedded into efficient black-box type algorithm. To critically evaluate its proposed treatment, we compiled experimental benchmark set 31 ΔrG 22 15 different solvents. Using a representative best-practice computational protocol (at wave function theory (WFT) DLPNO-CCSD(T) density functional (DFT) revDSD-PBEP86-D4 level with model), determined sizeable ranging 2-11 kcal mol-1. presented herein, corrected chemical accuracy ≤1 mol-1 (WFT DFT). The same applies at WFT level. Barriers DFT are overestimated 2 (classic) underestimated (corrected). effect attributed finding barriers systematically 2-3 lower than obtained WFT.

Язык: Английский

Best‐Practice DFT Protocols for Basic Molecular Computational Chemistry** DOI
Markus Bursch, Jan‐Michael Mewes, Andreas Hansen

и другие.

Angewandte Chemie International Edition, Год журнала: 2022, Номер 61(42)

Опубликована: Сен. 14, 2022

Nowadays, many chemical investigations are supported by routine calculations of molecular structures, reaction energies, barrier heights, and spectroscopic properties. The lion's share these quantum-chemical applies density functional theory (DFT) evaluated in atomic-orbital basis sets. This work provides best-practice guidance on the numerous methodological technical aspects DFT three parts: Firstly, we set stage introduce a step-by-step decision tree to choose computational protocol that models experiment as closely possible. Secondly, present recommendation matrix guide choice depending task at hand. A particular focus is achieving an optimal balance between accuracy, robustness, efficiency through multi-level approaches. Finally, discuss selected representative examples illustrate recommended protocols effect choices.

Язык: Английский

Процитировано

499

CREST—A program for the exploration of low-energy molecular chemical space DOI Creative Commons
Philipp Pracht, Stefan Grimme, Christoph Bannwarth

и другие.

The Journal of Chemical Physics, Год журнала: 2024, Номер 160(11)

Опубликована: Март 21, 2024

Conformer–rotamer sampling tool (CREST) is an open-source program for the efficient and automated exploration of molecular chemical space. Originally developed in Pracht et al. [Phys. Chem. Phys. 22, 7169 (2020)] as driver calculations at extended tight-binding level (xTB), it offers a variety molecular- metadynamics simulations, geometry optimization, structure analysis capabilities. Implemented algorithms include procedures conformational sampling, explicit solvation studies, calculation absolute entropy, identification protonation deprotonation sites. Calculations are set up to run concurrently, providing single-node parallelization. CREST designed require minimal user input comes with implementation GFNn-xTB Hamiltonians GFN-FF force-field. Furthermore, interfaces any quantum chemistry force-field software can easily be created. In this article, we present recent developments code show selection applications most important features program. An novelty refactored backend, which provides significant speed-up small or medium-sized drug molecules allows more sophisticated setups, example, mechanics/molecular mechanics minimum energy crossing point calculations.

Язык: Английский

Процитировано

114

Best‐Practice DFT Protocols for Basic Molecular Computational Chemistry** DOI Creative Commons
Markus Bursch, Jan‐Michael Mewes, Andreas Hansen

и другие.

Angewandte Chemie, Год журнала: 2022, Номер 134(42)

Опубликована: Сен. 14, 2022

Abstract Nowadays, many chemical investigations are supported by routine calculations of molecular structures, reaction energies, barrier heights, and spectroscopic properties. The lion's share these quantum‐chemical applies density functional theory (DFT) evaluated in atomic‐orbital basis sets. This work provides best‐practice guidance on the numerous methodological technical aspects DFT three parts: Firstly, we set stage introduce a step‐by‐step decision tree to choose computational protocol that models experiment as closely possible. Secondly, present recommendation matrix guide choice depending task at hand. A particular focus is achieving an optimal balance between accuracy, robustness, efficiency through multi‐level approaches. Finally, discuss selected representative examples illustrate recommended protocols effect choices.

Язык: Английский

Процитировано

99

Overview on Building Blocks and Applications of Efficient and Robust Extended Tight Binding DOI
Abylay Katbashev, Marcel Stahn, Thomas Rose

и другие.

The Journal of Physical Chemistry A, Год журнала: 2025, Номер unknown

Опубликована: Фев. 27, 2025

The extended tight binding (xTB) family of methods opened many new possibilities in the field computational chemistry. Within just 5 years, GFN2-xTB parametrization for all elements up to Z = 86 enabled more than a thousand applications, which were previously not feasible with other electronic structure methods. xTB provide robust and efficient way apply quantum mechanics-based approaches obtaining molecular geometries, computing free energy corrections or describing noncovalent interactions found applicability targets. A crucial contribution success is availability within simulation packages frameworks, supported by open source development its program library packages. We present comprehensive summary applications capabilities different fields Moreover, we consider main software calculations, covering their current ecosystem, novel features, usage scientific community.

Язык: Английский

Процитировано

3

Kinetic barrier networks reveal rate limitations in ion-selective membranes DOI
Ryan Kingsbury,

Michael A. Baird,

Junwei Zhang

и другие.

Matter, Год журнала: 2024, Номер 7(6), С. 2161 - 2183

Опубликована: Апрель 25, 2024

Язык: Английский

Процитировано

16

Molecular Gas-Phase Conformational Ensembles DOI Open Access
Susanta Das, Kenneth M. Merz

Journal of Chemical Information and Modeling, Год журнала: 2024, Номер 64(3), С. 749 - 760

Опубликована: Янв. 11, 2024

Accurately determining the global minima of a molecular structure is important in diverse scientific fields, including drug design, materials science, and chemical synthesis. Conformational search engines serve as valuable tools for exploring extensive conformational space molecules identifying energetically favorable conformations. In this study, we present comparison Auto3D, CREST, Balloon, ETKDG (from RDKit), which are freely available engines, to evaluate their effectiveness locating minima. These employ distinct methodologies, machine learning (ML) potential-based, semiempirical, force field-based approaches. To validate these methods, propose use collisional cross-section (CCS) values obtained from ion mobility–mass spectrometry studies. We hypothesize that experimental gas-phase CCS can provide evidence likely have minimum given molecule. facilitate effort, used our conformation library (GPCL) currently consists full ensembles 20 small be by community any engine. Further members GPCL readily created molecule interest using standard workflow compute values, expanding ability validation exercises. innovative techniques enhance understanding landscape insights into performance generation engines. Our findings shed light on strengths limitations each engine, enabling informed decisions utilization various where accurate determination crucial biological activity designing targeted interventions. By facilitating identification reliable conformations, study significantly contributes enhancing efficiency accuracy determination, with particular focus metabolite elucidation. The research also developing effective workflows predicting structures unknown compounds high precision.

Язык: Английский

Процитировано

8

A human-machine interface for automatic exploration of chemical reaction networks DOI Creative Commons
Miguel Steiner, Markus Reiher

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Май 1, 2024

Abstract Autonomous reaction network exploration algorithms offer a systematic approach to explore mechanisms of complex chemical processes. However, the resulting networks are so vast that an all potentially accessible intermediates is computationally too demanding. This renders brute-force explorations unfeasible, while with completely pre-defined or hard-wired constraints, such as element-specific coordination numbers, not flexible enough for systems. Here, we introduce STEERING WHEEL guide otherwise unbiased automated exploration. The algorithm intuitive, generally applicable, and enables one focus on specific regions emerging network. It also allows guiding data generation in context mechanism exploration, catalyst design, other optimization challenges. demonstrated elucidation transition metal catalysts. We highlight how catalytic cycles reproducible way. objectives fully adjustable, allowing harness both structure-specific (accurate) calculations well broad high-throughput screening possible intermediates.

Язык: Английский

Процитировано

8

Multiscale computational analysis of the effect of end group modification on PM6:BTP-x OSCs performance DOI

Qingxing Wu,

Chongchen Xiang,

Guangjun Zhang

и другие.

Journal of Materials Chemistry C, Год журнала: 2024, Номер 12(34), С. 13311 - 13324

Опубликована: Янв. 1, 2024

Theoretical computational simulation are used to analyse the molecular stacking characteristics of PM6:BTP- x OSCs and role end group modifications.

Язык: Английский

Процитировано

7

Optical and Electrical Dual-Mode Detection of a Carcinogenic Substance Based on Synergy of Liquid Crystals and Ionic Liquids DOI
Li Li,

Yixuan Mei,

Zejun Sun

и другие.

ACS Sensors, Год журнала: 2025, Номер unknown

Опубликована: Янв. 2, 2025

Visual, sensitive, and selective detection of carcinogenic substances is highly desired in portable health protection practical medicine production. However, achieving this goal presents significant challenges with the traditional single-mode sensors reported so far, as they have limited sensing mechanisms provide only a single output signal. Here, we report an effective optical electrical dual-mode sensor for visual,

Язык: Английский

Процитировано

1

Nauclofficines A and B, Two Novel Monoterpenoid Indole Alkaloids from the Li Folk Herb Nauclea officinalis with Anti-allergic Inflammatory Effects on RBL-2H3 Cells DOI
Yanli Li, Ting Wang, Hao Wang

и другие.

Journal of Ethnopharmacology, Год журнала: 2025, Номер unknown, С. 119533 - 119533

Опубликована: Фев. 1, 2025

Язык: Английский

Процитировано

1