International Journal of Quantum Chemistry

Cover image for Vol. 117 Issue 9

Impact Factor: 2.184

ISI Journal Citation Reports © Ranking: 2015: 17/35 (Physics Atomic Molecular & Chemical); 19/101 (Mathematics Interdisciplinary Applications); 77/144 (Chemistry Physical)

Online ISSN: 1097-461X

Associated Title(s): Journal of Computational Chemistry

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Recently Published Articles

  1. Improved Pöschl–Teller potential energy model for diatomic molecules

    Chun-Sheng Jia, Lie-Hui Zhang and Xiao-Long Peng

    Version of Record online: 30 MAR 2017 | DOI: 10.1002/qua.25383

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    This article presents an improved Pöschl–Teller potential energy model, and gives the comparison of the improved Pöschl–Teller potential and Morse potential. Initially proposed in the 30s, the Pöschl–Teller potential energy model in an analytical potential to model diatomic interactions. By employing the dissociation energy and the equilibrium internuclear distance for a diatomic molecule as explicit parameters, an improved Pöschl–Teller potential energy model is now proposed. It is found that this improved potential is more accurate than the Morse potential in fitting experimental RKR potential curves over a large range of internuclear distances for six molecules examined.

  2. Metal–metal bonding in biscycloheptatrienyl dimetal compounds of the second-row transition metals

    Zhihui Zhang, Xuejun Feng, Qun Chen, Mingyang He, Yaoming Xie, R. Bruce King and Henry F. Schaefer III

    Version of Record online: 23 MAR 2017 | DOI: 10.1002/qua.25374

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    Second-row transition metals complexes (C7H7)2M2 are explored in search for interesting examples of high order metal–metal multiple bonding. The lowest energy (C7H7)2Mo2 structure is a coaxial structure with terminal η7[BOND]C7H7 rings whereas the lowest energy (C7H7)2M2 structures (M = Ru, Tc, Nb, Zr) are perpendicular structures with bridging C7H7 rings. The metal–metal bond orders in the (C7H7)2M2 structures suggest preferred 16- rather than 18-electron configurations for the metal atoms.

  3. Benchmark values of Shannon entropy for spherically confined hydrogen atom

    Li Guang Jiao, Li Rong Zan, Yong Zhi Zhang and Yew Kam Ho

    Version of Record online: 21 MAR 2017 | DOI: 10.1002/qua.25375

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    Information entropies in both position and momentum spaces are of great useful in investigating structures for confined systems. However, computation of their values is nontrivial even for the simplest atom. This work established benchmark values of the Shannon entropy for confined hydrogenic atoms in both ground and excited states. Similar variations among states with same nodal structures were revealed.

  4. Structural influence of transition metal (Sc, Y, and Lu) atoms inside gold nanoparticles

    Li Xia Zhao, Yuh Hijikata and Stephan Irle

    Version of Record online: 21 MAR 2017 | DOI: 10.1002/qua.25371

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    Substitutions of one Au atom in rhombohedral Au4 clusters by one transition metal M (M= Sc, Y, and Lu) atom induces an Au3M transformation to equilateral triangles, where the doping atoms occupy the center of the triangles, and Au3M units tend to take tetrahedral configurations in the Au32 cage. This insight on the structural influence of transition metal in gold nanoparticles could potentially impact the design and the applicability for catalytic reactions of such bimetallic materials.

  5. Lagrange function method for energy optimization directly in the space of natural orbitals

    Yu Wang, Jian Wang and Hans Lischka

    Version of Record online: 21 MAR 2017 | DOI: 10.1002/qua.25376

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    A Lagrange method to obtain the electronic energy directly in the space of natural orbitals is obtained by constructing Lagrange functions that contain constraints to force the off-diagonal elements of the one-particle density matrix to zero. This ensures that molecular orbitals converge to the natural orbitals simultaneously while the energy minimizes. The recently discovered “generalized Pauli conditions” for the occupation numbers are invoked to generate an initial approximation.

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