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open source ab initio electronic structure program  (Janssen)

 
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    Janssen open source ab initio electronic structure program
    Open Source Ab Initio Electronic Structure Program, supplied by Janssen, used in various techniques. Bioz Stars score: 86/100, based on 1 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
    https://www.bioz.com/product/open-source+program/ab+electronic+initio+open+program+source+structure/pm42309004-529-68-42
    Average 86 stars, based on 1 article reviews
    open source ab initio electronic structure program - by Bioz Stars, 2026-10
    86/100 stars

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    Article Title: Methyl•••Methyl Interactions in Proteins: Insights from Structural and Computational Studies.
    Article Snippet: The low affinity of nonpolar groups for water gave birth to one of the significant supramolecular forces known as hydrophobic interaction as early as 1937.. While the precise origins of this phenomenon remain debated, the significant role of London dispersion forces in stabilizing nonpolar complexes is wellestablished.. This article presents a comprehensive investigation of the nature and strength of CH3•••H3C (methyl−methyl) interactions within the amino acid residues of proteins, employing a combination of quantum mechanical calculations and custom Python code.

    Article Title: Hierarchical Chiral Self-Assembly of Nanocylinders Composed of Sequence-Defined Mesogenic Dimers.
    Article Snippet: XXXX, XXX, XXX−XXX P (106) Turney, J. M.; Simmonett, A. C.; Parrish, R. M.; Hohenstein, E. G.; Evangelista, F. A.; Fermann, J. T.; Mintz, B. J.; Burns, L. A.; Wilke, J. J.; Abrams, M. L.; Russ, N. J.; Leininger, M. L.; Janssen, C. L.; Seidl, E. T.; Allen, W. D.; Schaefer, H. F.; King, R. A.; Valeev, E. F.; Sherrill, C. D.; Crawford, T. D. Psi4: An Open-Source Ab Initio Electronic Structure Program.

    Article Title: System-Specific Reparameterization of Density Functionals with Machine Learning: Application to Spin-Splitting Energies of Transition Metal Complexes.
    Article Snippet: Accurate estimates of the spin-splitting energy (SSE) are essential for proper modeling of transition metal complex (TMC) catalysts and functional materials but are notoriously challenging to achieve.. Over a large set of over 450 TMCs, we demonstrate that adding Hartree−Fock exchange (HFX) to semilocal density functionals (e.g., PBE or SCAN) in a system-specific fashion provides the flexibility to significantly reduce errors relative to reference wave function theory (i.e., DLPNO−CCSD(T)) values.. Nevertheless, to do so requires that one knows the correct amount of HFX to add to the functional, which is systemdependent.

    Article Title: Advancing the CL&Pol Polarizable Force Field for Accurate Modeling of Mg 2+ , Ca 2+ , and Zn 2+ Electrolytes.
    Article Snippet: Divalent cations such as Mg2+, Ca2+, or Zn2+ are promising candidates for powerful and affordable post-Li batteries due to their high natural abundance and an expected two-electron transfer per charge carrier.. But an accurate representation of divalent cations in electrolytes by molecular dynamics simulations remains challenging due to the effects of their high charge density.. For ionic systems such as the ones studied here, a molecular interaction model with explicit polarization terms, using Drude induced dipoles, largely improves the representation of equilibrium and transport properties when compared to fixed-charge models.

    Article Title: Supporting Information for Adjusting the Local Arrangement of π-Stacked Oligothiophenes through Hydrogen Bonds: A Viable Route to Promote Charge Transfer
    Article Snippet: 2011, 135, 174107/1-174107/13. (11) Turney, J. M.; Simmonett, A. C.; Parrish, R. M.; Hohenstein, E. G.; Evangelista, F. A.; Fermann, J. T.; Mintz, B. J.; Burns, L. A.; Wilke, J. J.; Abrams, M. L.; Russ, N. J.; Leininger, M. L.; Janssen, C. L.; Seidl, E. T.; Allen, W. D.; Schaefer, H. F.; King, R. A.; Valeev, E. F.; Sherrill, C. D.; Crawford, T. D. PSI4: An Open-Source Ab Initio Electronic Structure Program.

    Article Title: π-π Stacking and Structural Configurations in Aromatic Thiophene and Fluorobenzene Dimers Revealed by Rotational Spectroscopy.
    Article Snippet: Understanding the structures and bonding interactions between aromatic systems is crucial for interpreting the properties of biological molecules and materials.. In this study, we employed chirp-polarization Fourier-transform microwave spectroscopy to investigate the structures and noncovalent interactions in both homogeneous and heterogeneous dimers formed by thiophene and fluorobenzene molecules.. Our findings reveal that the thiophene dimer adopts a T-shaped structure, while the fluorobenzene dimer predominantly exhibits a parallel-displaced arrangement.

    Article Title: Competition between Hydrogen and Chalcogen Bonding in Homodimers of Chalcogen Hydrides (H 2 X) 2 , X = O, S, Se, Te.
    Article Snippet: The structural and chemical bonding motifs manifested by the competition between hydrogen and chalcogen bonding in the homodimers of chalcogen hydrides (H2X)2, where X = O, S, Se, Te have been characterized using high-level electronic structure calculations and analysis of the electron density based on Quasi-atomic orbital (QUAO) and the Symmetry-adapted perturbation theory (SAPT) methods.. The QUAO analysis clearly identifies a three-center interaction responsible for either hydrogen or chalcogen bonds: in the former, the σ-bond connecting the donor and hydrogen atom participating in the hydrogen bond interacts with the lone pair on the nucleophile acceptor via the hydrogen atom, while in the latter this same σ-bond interacts with the nucleophile lone pair via the donor chalcogen.. The number of minimum energy structures increase dramatically from one for (H2O)2, three for (H2S)2, four for (H2Se)2, and finally six for (H2Te)2.

    Article Title: Different Stacking Types in a Single Hybrid Cocrystal System: π···π- and π-Hole-Based Organic-Inorganic Planar Assemblies.
    Article Snippet: The planar bis-chelated complex [Pd(NO)2] (1; N∩O = 4MeC5H3NNC(O)NMe2) exhibits two distinct stacking modes with electrondeficient aromatics: π···π stacking with hexafluorobenzene (C6F6) versus chargetransfer π−hole interactions with 1,2,4,5-tetracyanobenzene (TCB).. Cocrystallization of the complex with C6F6 or TCB yields cocrystals 1·3(C6F6) and 1·2TCB, respectively, which display different colors and stacking patterns despite similar structural motifs.. Comprehensive analysis using X-ray diffraction, combined with quantum theory of atoms-in-molecules (QTAIM), an independent gradient model based on Hirshfeld partition (IGMH), extended transition state natural orbital for chemical valence theory with charge displacement function (ETS-NOCV/CDF), many-body interaction analysis, and symmetry-adapted perturbation theory (SAPT), reveals fundamentally different interaction mechanisms.



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