Article
Chemistry, Physical
Juan Felipe Huan Lew-Yee, Mario Piris, Jorge M. del Campo
Summary: In this work, an algebraic approach named DoNOF-RI is developed to implement the resolution of the identity approximation within the Piris Natural Orbital Functional (PNOF). This implementation reduces arithmetic and memory scaling, leading to significant computational time savings. After full convergence, a restart with four-center electron repulsion integrals quickly converges to the exact result, showing improvement in numerical results and speed-ups compared to PNOF7.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Engineering, Chemical
Timothy T. Duignan, X. S. Zhao
Summary: This study predicts osmotic/activity coefficients of alkali hydroxide aqueous electrolytes without fitting using a continuum solvent model, indicating its reliability and potential for fast and accurate prediction of important quantities for a wide range of electrolyte solutions through first principles molecular simulation. It also suggests that an explicit description of the structure of water molecules around ions may not be necessary for predicting important thermodynamic properties.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Physical
Lars Hellmann, Johannes Toelle, Niklas Niemeyer, Johannes Neugebauer
Summary: Range-separated hybrid functionals have been proven to be valuable for improving Kohn-Sham density functional theory calculations, especially for accurate excitation energies. We have developed a new approach to optimize auxiliary basis sets and significantly reduce the number of auxiliary functions required. The efficiency of this method has been demonstrated in real-world examples.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2022)
Article
Chemistry, Inorganic & Nuclear
Stefan S. Rudel, Tim Graubner, Antti J. Karttunen, Stefanie Dehnen, Florian Kraus
Summary: This study investigated the reactivity of [SiF4(NH3)(2)] with fluorides in anhydrous liquid ammonia, leading to the discovery of new compounds with rare structures. The compounds were characterized using X-ray diffraction, revealing interesting interactions such as thallophilic interactions and hydrogen-bonded cations.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Physical
Irena Efremenko, Jan M. L. Martin
Summary: This study evaluated accurate canonical CCSD(T) energies for reactions between benzene and methyl acrylate catalyzed by Ru(II, III) chloride carbonyl, and compared the performance of different methods and density functionals. The results showed that some new density functionals exhibit superior performance in both closed- and open-shell calculations, and most tested (meta)-GGA and hybrid density functionals perform better for open-shell complexes.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Chemistry, Physical
Yi-Fang Chen, Li-Kang Chu
Summary: This study provides suitable detection windows for atmospheric and aerosol reactions in laboratory studies by characterizing the infrared spectra of isotopic analogues of methanediols.
JOURNAL OF PHYSICAL CHEMISTRY A
(2022)
Article
Chemistry, Physical
R. Remme, T. Kaczun, M. Scheurer, A. Dreuw, F. A. Hamprecht
Summary: Orbital-free density functional theory (OF-DFT) is a promising method for computing ground state molecular properties at minimal cost. In this study, we propose a deep neural network architecture called KineticNet to learn the kinetic energy functional from ground truth provided by the more expensive Kohn-Sham density functional theory. KineticNet achieves chemical accuracy for learned functionals across different input densities and geometries of small molecules, and even demonstrates OF-DFT density optimization with chemical accuracy for two-electron systems.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Maximilian Scheurer, Antonia Papapostolou, Thomas Fransson, Patrick Norman, Andreas Dreuw, Dirk R. Rehn
Summary: We present an implementation for the calculation of molecular response properties using the algebraic-diagrammatic construction (ADC)/intermediate state representation approach. Our approach improves the convergence behavior for different numerical algorithms compared with the standard implementation. All routines are implemented in an open-source Python library.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Yonghao Gu, Zhenyu Zhu, Xin Xu
Summary: Analytic derivative methods in quantum chemistry are powerful tools for calculating molecular properties and simulating chemical systems. Developments in second-order derivative theory for xDH functionals have shown high-quality results in molecular harmonic and anharmonic vibrational frequency calculations, demonstrating the accuracy of xDH functionals in predicting spectroscopic properties for medium-sized molecules.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2021)
Article
Chemistry, Physical
Eirill Hauge, Hakon Emil Kristiansen, Lukas Konecny, Marius Kadek, Michal Repisky, Thomas Bondo Pedersen
Summary: We propose a novel function fitting method for approximating the propagation of the time-dependent electric dipole moment from real-time electronic structure calculations. The method achieves arbitrary spectral resolution through extrapolation by fitting shorter dipole trajectories. Numerical testing demonstrates that this fitting method can reproduce high-resolution spectra using short dipole trajectories.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2023)
Article
Biochemistry & Molecular Biology
Jingli Liu, Hui Guo, Jing Zhou, Yuwei Wang, Hao Yan, Ruyi Jin, Yuping Tang
Summary: This study optimized the molecular geometries of EVO and RUT and investigated their chemical properties and anticancer mechanisms. The results suggest that EVO and RUT may serve as potential anticancer drugs.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Multidisciplinary Sciences
Simon Batzner, Albert Musaelian, Lixin Sun, Mario Geiger, Jonathan P. Mailoa, Mordechai Kornbluth, Nicola Molinari, Tess E. Smidt, Boris Kozinsky
Summary: This paper introduces an E(3)-equivariant deep learning method for accelerating molecular dynamics simulations. The method shows state-of-the-art accuracy and remarkable sample efficiency in faithfully describing the dynamics of complex systems. The Neural Equivariant Interatomic Potentials (NequIP) approach employs E(3)-equivariant convolutions to interact with geometric tensors, resulting in a more information-rich and faithful representation of atomic environments. NequIP outperforms existing models with significantly fewer training data, challenging the commonly held belief about the necessity of massive training sets for deep neural networks.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Roberto Flores-Moreno, Sara A. Cortes-Llamas, Kayim Pineda-Urbina, Victor M. Medel, Gururaj Kudur Jayaprakash
Summary: Analytical calculation of alchemical derivatives based on auxiliary density perturbation theory was described, coded, and validated. Efficient estimation of proton binding energies for hydrogen atom nucleus with changing nuclear charge from 1 to 0 was achieved. The refinement in accuracy allowed for quantitative exploration of differential acidity, producing the h function in its analytical form as a byproduct.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Chemistry, Physical
Hiroya Nakata, Dmitri G. Fedorov
Summary: The analytic energy gradient of energy with respect to nuclear coordinates is derived for the fragment molecular orbital (FMO) method combined with time-dependent density functional theory (TDDFT). The response terms arising from the use of a polarizable embedding are derived. The obtained analytic FMOTDDFT gradient is shown to be accurate in comparison to both numerical FMO-TDDFT and unfragmented TDDFT gradients, at the level of two-and three-body expansions. The gradients are used for geometry optimizations, molecular dynamics, vibrational calculations, and simulations of IR and Raman spectra of excited states. The developed method is used to optimize the geometry of the ground and excited electronic states of the photoactive yellow protein (PDB: 2PHY).
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2023)
Article
Chemistry, Physical
Kai Wang, Ze-Zhao Jia, Zheng Fan, Hong-Yuan Zhao, Guang-Jia Yin, Ramiro Moro, Bernd von Issendorff, Lei Ma
Summary: We systematically studied the structures and electronic properties of vanadium-doped silicon cluster anions through photoelectron spectroscopy measurements and theoretical calculations. Different structures were found in clusters of different sizes, and the most stable structure was identified.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Jing Liu, Christof Haettig, Sebastian Hoefener
JOURNAL OF CHEMICAL PHYSICS
(2020)
Article
Chemistry, Multidisciplinary
Bin Hu, Lisa Warczinski, Xiaoyu Li, Mohong Lu, Johannes Bitzer, Markus Heidelmann, Till Eckhard, Qi Fu, Jonas Schulwitz, Mariia Merko, Mingshi Li, Wolfgang Kleist, Christof Hattig, Martin Muhler, Baoxiang Peng
Summary: This study demonstrates an efficient method for the hydrogenolysis of HMF to DMF under mild reaction conditions using Pd nanoparticles supported on N-containing and N-free mesoporous carbon materials, along with formic acid (FA) and hydrogen. It was found that the main role of FA is to shift the dominant reaction pathway from the hydrogenation of the aldehyde group to the hydrogenolysis of the hydroxymethyl group, thereby significantly enhancing the reaction rate. The interaction between Pd2+ species and pyridine-like N atoms was shown to enhance the selective hydrogenolysis of the C-OH bond in the presence of FA, leading to the stabilization of H-.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Physical
S. Ghidinelli, G. Longhi, S. Abbate, C. Haettig, S. Coriani
Summary: UV-vis absorption and magnetic circular dichroism spectra of naphthalene and its derivatives were simulated using CC2 and TD-DFT methods. CC2 simulations showed the best agreement with experimental data. Analysis of electric dipole and magnetic dipole transition moments helped interpret electronic transitions and Faraday B term inversion among naphthalene derivatives.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Chemistry, Physical
Daniil A. Fedotov, Sonia Coriani, Christof Haettig
Summary: The study presents an implementation of a complex solver for computing the complex response functions of damped response theory. The solver uses a partitioned formulation to avoid storing double excitation amplitudes, making it widely applicable in the context of the resolution-of-identity (RI) coupled cluster singles and approximate doubles (CC2) method.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Lisa Warczinski, Christof Haettig
Summary: The study using density functional theory (DFT) discusses the process of hydrogen spillover on metal nanoparticle decorated carbon surfaces, showing that graphitic nitrogen atoms and water molecules play significant roles in facilitating the hydrogen spillover reaction.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Arjeta Rushiti, Christof Haettig, Bo Wen, Annabella Selloni
Summary: Research suggests that CFO may be a promising oxidation catalyst due to its relatively low energy cost of vacancy formation and strong affinity towards water, making it more competitive than NiCo2O4 and Co3O4.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Shota Tsuru, Bikramjit Sharma, Masanari Nagasaka, Christof Haettig
Summary: Solvent-solute electrostatic interactions and solvent configuration fluctuations can affect solute excitation energies, potentially dominating dynamics in solution systems and causing shifts or broadening of absorption peaks. Experimental absorption spectra of a solute in aqueous solution were accurately reproduced by combining theoretical treatment of explicit local solvation structures with the COSMO solvation model for long-range solvation.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Chemistry, Multidisciplinary
Arjeta Rushiti, Christof Haettig
Summary: This study investigated the pathways of dioxygen activation on the (001) surfaces of cobalt ferrite using density functional theory. The results suggest that activation is promoted by electron transfer from d metal centers onto the adsorbed oxygen, with subsequent dissociation of dioxygen and surface reoxidation identified as critical steps that may limit the rate of the oxidation processes.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Physical
Robert S. Tress, Christof Haettig, Sebastian Hoefener
Summary: In this work, a modified frozen density embedding method is proposed to reduce charge spill-out and improve the consistency of calculations by adding all-electron pseudopotentials.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2022)
Article
Chemistry, Multidisciplinary
Niklas Suelzner, Julia Haberhauer, Christof Haettig, Arnim Hellweg
Summary: In this contribution, the conductor-like screening model for realistic solvation (COSMO-RS) is extended to predict pK(a) values in acetone. 120 organic acids were analyzed using COSMO-RS, and the results showed that the data set can be divided into two groups, with the phenols being different from the other three subsets. The acrylic and benzoic acids and the sulfonamides can be treated together and yield an excellent linear correlation, while the phenols exhibit a slope larger than one.
JOURNAL OF COMPUTATIONAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Robert S. Tress, Jing Liu, Christof Haettig, Sebastian Hoefener
Summary: Frozen density embedding (FDE) is a simple and user-friendly embedding method for complex environments. Combining FDE with pair natural orbitals (PNOs) reduces computation time. Tests on TAPP molecular crystals show that the truncation error of PNO-based wavefunction methods is smaller than the shifts themselves, allowing for a combination with the FDE method.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Niklas Suelzner, Christof Haettig
Summary: This study applies the thermodynamic Förster cycle to investigate the excited-state pKa values of pyranine-derived superphotoacids. The results show that the calculated electronic excitations agree well with experimental data, suggesting the validity of this approach. The calculations also reveal that the redistribution of charge from the hydroxy group to the aromatic ring and electron-withdrawing substituents is the origin of photoacidity for these superphotoacids.
JOURNAL OF PHYSICAL CHEMISTRY A
(2022)
Article
Chemistry, Physical
Shota Tsuru, Bikramjit Sharma, Dominik Marx, Christof Haettig
Summary: This study investigates the impact of sampling methods on spectral broadening in the gas phase and on the convergence of spectra in aqueous solution using microsolvation, continuum solvation, and hybrid models with pyrazine as a test case. The results show that static and time-resolved X-ray absorption spectra obtained with Wigner and Maxwell-Boltzmann samplings in the gas phase agree well. In aqueous solution, only the first two energetically low-lying bands converge quickly with the size of the explicitly included solvation shells, indicating the importance of continuum solvation in computational UV-vis absorption spectra.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2023)
Article
Chemistry, Physical
Arjeta Rushiti, Tobias Falk, Martin Muhler, Christof Haettig
Summary: By using density functional theory and an embedded cluster model, we investigated the surface structure and reactivity of cobalt ferrite, finding that adsorbates exhibit different behaviors depending on the adsorption sites.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Sarah Karbalaei Khani, Bastian Geissler, Elric Engelage, Patrick Nuernberger, Christof Haettig
Summary: By investigating the absorption and fluorescence of halogenated imidazolium compounds in acetonitrile solution with different counterions and their ability as halogen-bond donors, spectroscopic signatures and photoinduced dynamics associated with ion-pairing were identified through experimental measurements and quantum chemical calculations.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)