1
|
Chrayteh A, Blondel A, Loos PF, Jacquemin D. Mountaineering Strategy to Excited States: Highly Accurate Oscillator Strengths and Dipole Moments of Small Molecules. J Chem Theory Comput 2020; 17:416-438. [DOI: 10.1021/acs.jctc.0c01111] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Amara Chrayteh
- Université de Nantes, CNRS, CEISAM UMR 6230, F-44000 Nantes, France
| | - Aymeric Blondel
- Université de Nantes, CNRS, CEISAM UMR 6230, F-44000 Nantes, France
| | - Pierre-François Loos
- Laboratoire de Chimie et Physique Quantiques, Université de Toulouse, CNRS, UPS, 31062 Toulouse, France
| | - Denis Jacquemin
- Université de Nantes, CNRS, CEISAM UMR 6230, F-44000 Nantes, France
| |
Collapse
|
2
|
Xu LT, Dunning TH. A cautionary tale: Problems in the valence-CASSCF description of the ground state (X1Σ+) of BF. J Chem Phys 2020; 153:114113. [DOI: 10.1063/5.0024134] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Affiliation(s)
- Lu T. Xu
- Department of Chemistry, University of Washington, Seattle, Washington 98195, USA
| | - Thom H. Dunning
- Department of Chemistry, University of Washington, Seattle, Washington 98195, USA
| |
Collapse
|
3
|
Mukhopadhyay DP, Schleier D, Fischer I, Loison JC, Alcaraz C, Garcia GA. Photoelectron spectroscopy of boron-containing reactive intermediates using synchrotron radiation: BH 2, BH, and BF. Phys Chem Chem Phys 2020; 22:1027-1034. [PMID: 31854408 DOI: 10.1039/c9cp06010c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mass selected slow photoelectron spectra (SPES) of three boron-containing reactive species, BH2, BH, and BF were recorded by double imaging photoion-photoelectron coincidence spectroscopy (i2PEPICO) using synchrotron radiation. All species were generated in a flow reactor from the H-abstraction of B2H6 by F atoms created in a F2 microwave discharge. The spectrum of BH2+ exhibits a long bending mode progression with a 970 cm-1 spacing due to the large geometry change from bent to linear upon ionization. Its ionization energy was determined as 8.12 ± 0.02 eV. For BH, photoionisation from both X1Σ+ singlet and a3Π triplet state was observed, permitting the experimental determination of the singlet/triplet gap (ΔEST) from the observed IE's of 9.82 eV and 8.48 eV. In addition, a threshold photoelectron spectrum of BF was recorded, which leads to an IE of 11.11 eV and an improved value for νBF+ of 1690 cm-1. All spectra were simulated by calculating Franck-Condon factors from optimised structures based on quantum chemical calculations.
Collapse
Affiliation(s)
- D P Mukhopadhyay
- Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany.
| | - D Schleier
- Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany.
| | - I Fischer
- Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany.
| | - J-C Loison
- ISM-CNRS, Université de Bordeaux, 351 cours de la Libération, F-, 33405 Talence, France
| | - C Alcaraz
- LCP, UMR 8000, CNRS-Univ. Paris-Sud and Paris Saclay, Bât. 350, Centre Universitaire Paris-Sud, F-91405 Orsay, France
| | - G A Garcia
- Synchrotron SOLEIL, L'Orme des Merisiers, St Aubin, B.P. 48, F-91192 Gif sur Yvette, France
| |
Collapse
|
4
|
Casals-Sainz JL, Fernández-Alarcón A, Francisco E, Costales A, Martín Pendás Á. Bond Order Densities in Real Space. J Phys Chem A 2020; 124:339-352. [PMID: 31873015 DOI: 10.1021/acs.jpca.9b10113] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this contribution we introduce the concept of bond order density (BOD) on the basis of a previous work on natural adaptive orbitals. We show that BODs may be used to visualize both the global spatial distribution of the covalent bond order and its eigencomponents, which we call bond(ing) channels. BODs can be equally computed at correlated and noncorrelated levels of theory and in ground or excited states, thus offering an appealing description of bond-forming, bond-breaking, and bond-evolution processes. We show the power of the approach by examining a number of homo- and heterodiatomics, including the controversial existence of a fourth bonding component in dicarbon, by analyzing a few interesting bonding situations in polyatomics and chemical transformations, and by exemplifying exotic bonding behaviors in simple excited electronic states.
Collapse
Affiliation(s)
- José Luis Casals-Sainz
- Departamento de Química Física y Analítica , Universidad de Oviedo , 33006 Oviedo , Spain
| | - A Fernández-Alarcón
- Departamento de Química Física y Analítica , Universidad de Oviedo , 33006 Oviedo , Spain
| | - Evelio Francisco
- Departamento de Química Física y Analítica , Universidad de Oviedo , 33006 Oviedo , Spain
| | - Aurora Costales
- Departamento de Química Física y Analítica , Universidad de Oviedo , 33006 Oviedo , Spain
| | - Ángel Martín Pendás
- Departamento de Química Física y Analítica , Universidad de Oviedo , 33006 Oviedo , Spain
| |
Collapse
|
5
|
Claudino D, Bartlett RJ. Coupled-cluster based basis sets for valence correlation calculations. New primitives, frozen atomic natural orbitals, and basis sets from double to hextuple zeta for atoms H, He, and B–Ne. J Chem Phys 2018; 149:064105. [DOI: 10.1063/1.5039741] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Daniel Claudino
- Quantum Theory Project, University of Florida, Gainesville, Florida 32611, USA
| | - Rodney J. Bartlett
- Quantum Theory Project, University of Florida, Gainesville, Florida 32611, USA
| |
Collapse
|
6
|
Zhu W, Shi D, Sun J, Zhu Z. Accurate spectroscopic calculations of the 14Λ-S and 30Ω states of BF + cation including the spin-orbit coupling effect. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 171:478-486. [PMID: 27588956 DOI: 10.1016/j.saa.2016.08.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 08/11/2016] [Accepted: 08/14/2016] [Indexed: 06/06/2023]
Abstract
This paper studied the potential energy curves of 30Ω states yielded from the 14Λ-S states (X2Σ+, 12Π, 22Π, 32Π, 12Σ-, 22Σ+, 32Σ+, 12Δ, 14Σ-, 14Σ+, 24Σ+, 14Π, 24Π, and 14Δ) of the BF+ cation. The potential energy curves were calculated for internuclear separations from approximately 0.08 to 1.1nm using the CASSCF method, which was followed by the icMRCI approach with the aug-cc-pV6Z basis set. Of these 14Λ-S states, the 24Σ+ and 24Π states were repulsive. The 22Π and 32Π states had double wells. The avoided crossings were found between the 12Π and the 22Π state, and between the 32Π and the 42Π state. The 12Π, 22Π, 32Π, and 14Π states were inverted with the spin-orbit coupling effect taken into account. The 14Π state and the second wells of 22Π and 32Π states were weakly bound. Each of the 12Π, 22Π, and 32Π states had one barrier. The potential energy curves of all the Λ-S and Ω states were extrapolated to the complete basis set limit. Core-valence correlation and scalar relativistic corrections were included at the level of an aug-cc-pV5Z basis set. The spin-orbit coupling effect was included by the state interaction approach with the Breit-Pauli Hamiltonian and the all-electron cc-pCV5Z set. The spectroscopic parameters were determined and compared with available experimental and other theoretical ones. The spin-orbit coupling effect on the spectroscopic parameters was evaluated in detail. Comparison with available experimental data show that the methodology used in this paper is highly accurate for this system.
Collapse
Affiliation(s)
- Wenjie Zhu
- College of Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007, China
| | - Deheng Shi
- College of Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007, China.
| | - Jinfeng Sun
- College of Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007, China
| | - Zunlue Zhu
- College of Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007, China
| |
Collapse
|
7
|
Fantuzzi F, de Sousa DWO, Nascimento MAC. The Nature of the Chemical Bond from a Quantum Mechanical Interference Perspective. ChemistrySelect 2017. [DOI: 10.1002/slct.201601535] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Felipe Fantuzzi
- Departmento de Físico-Química, Instituto de Química; Universidade Federal do Rio de Janeiro; Avenida Athos da Silveira Ramos, 149, A-412
| | - David Wilian Oliveira de Sousa
- Departmento de Físico-Química, Instituto de Química; Universidade Federal do Rio de Janeiro; Avenida Athos da Silveira Ramos, 149, A-412
| | - Marco Antonio Chaer Nascimento
- Departmento de Físico-Química, Instituto de Química; Universidade Federal do Rio de Janeiro; Avenida Athos da Silveira Ramos, 149, A-412
| |
Collapse
|
8
|
Yoshida D, Raebiger H. Term rules for simple metal clusters. Sci Rep 2015; 5:15760. [PMID: 26497089 PMCID: PMC4620565 DOI: 10.1038/srep15760] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Accepted: 09/29/2015] [Indexed: 01/04/2023] Open
Abstract
Hund’s term rules are only valid for isolated atoms, but have no generalization for molecules or clusters of several atoms. We present a benchmark calculation of Al2 and Al3, for which we find the high and low-spin ground states 3Πu and , respectively. We show that the relative stabilities of all the molecular terms of Al2 and Al3 can be described by simple rules pertaining to bonding structures and symmetries, which serve as guiding principles to determine ground state terms of arbitrary multi-atom clusters.
Collapse
Affiliation(s)
- Daisuke Yoshida
- Department of Physics, Yokohama National University, Yokohama, Japan
| | - Hannes Raebiger
- Department of Physics, Yokohama National University, Yokohama, Japan.,Centro de Ciěncias Naturais e Humanas, Universidade Federal do ABC, Santo André, SP, Brazil
| |
Collapse
|
9
|
Fantuzzi F, Cardozo TM, Nascimento MAC. Nature of the chemical bond and origin of the inverted dipole moment in boron fluoride: a generalized valence bond approach. J Phys Chem A 2015; 119:5335-43. [PMID: 25531385 DOI: 10.1021/jp510085r] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The generalized product function energy partitioning (GPF-EP) method has been applied to investigate the nature of the chemical bond and the origin of the inverted dipole moment of the BF molecule. The calculations were carried out with GPF wave functions treating all of the core electrons as a single Hartree-Fock group and the valence electrons at the generalized valence bond perfect-pairing (GVB-PP) or full GVB levels, with the cc-pVTZ basis set. The results show that the chemical structure of both X (1)Σ(+) and a (3)Π states is composed of a single bond. The lower dissociation energy of the excited state is attributed to a stabilizing intraatomic singlet coupling involving the B 2sp-like lobe orbitals after bond dissociation. An increase of electron density on the B atom caused by the reorientation of the boron 2sp-like lobe orbitals is identified as the main responsible effect for the electric dipole inversion in the ground state of BF. Finally, it is shown that π back-bonding from fluorine to boron plays a minor role in the electron density displacement to the bonding region in both states. Moreover, this effect is associated with changes in the quasi-classical component of the electron density only and does not contribute to covalency in either of the states. Therefore, at least for the case of the BF molecule, the term back-bonding is misleading, since it does not contribute to the bond formation.
Collapse
Affiliation(s)
- Felipe Fantuzzi
- Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro RJ 21941-909, Brazil
| | - Thiago Messias Cardozo
- Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro RJ 21941-909, Brazil
| | | |
Collapse
|
10
|
Vassilakis AA, Kalemos A, Mavridis A. Accurate first principles calculations on chlorine fluoride ClF and its ions ClF±. Theor Chem Acc 2014. [DOI: 10.1007/s00214-013-1436-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|