1
|
Narendrapurapu BS, Bowman MC, Xie Y, Schaefer HF, Tkachenko NV, Boldyrev AI, Li G. Dibridged, Monobridged, Vinylidene-Like, and Linear Structures for the Alkaline Earth Dihydrides Be 2H 2, Mg 2H 2, Ca 2H 2, Sr 2H 2, and Ba 2H 2. Proposals for Observations. Inorg Chem 2020; 59:10404-10408. [PMID: 32674579 DOI: 10.1021/acs.inorgchem.0c01651] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This research reports a search for peculiar monobridged structures of the E2H2 molecules (E = Be, Mg, Ca, Sr, Ba). For Be2H2 and Mg2H2, the monobridged geometry is not an equilibrium but rather a transition state between the vinylidene-like structure and the global minimum HE-EH linear geometry. However, for Ca2H2, Sr2H2, and Ba2H2, this situation changes significantly; the linear structure is no longer the global minimum but lies higher in energy than two other equilibria, the dibridged and monobridged structures. The planar dibridged structures of both Sr2H2 and Ba2H2 should be observable via IR spectroscopy. Although the remarkable monobridged structures lie 8.3 (Sr) and 7.6 kcal/mol (Ba) higher, the large IR intensities of the terminal E-H stretching frequencies may make the monobridged structures observable. The monobridged structures have sizable permanent dipole moments (3.07 and 3.06 D for Sr and Ba, respectively) and also should be observable via microwave spectroscopy.
Collapse
Affiliation(s)
- Beulah S Narendrapurapu
- Department of Chemistry, Georgia Southern University, Statesboro, Georgia 30460, United States
| | - Michael C Bowman
- Department of Chemistry, Taylor University, Upland, Indiana 46989, United States
| | - Yaoming Xie
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - Henry F Schaefer
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - Nikolay V Tkachenko
- Department of Chemistry and Biochemistry, Utah State University, Logan, Utah 84322, United States
| | - Alexander I Boldyrev
- Department of Chemistry and Biochemistry, Utah State University, Logan, Utah 84322, United States
| | - Guoliang Li
- Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education; Center for Computational Quantum Chemistry, School of Chemistry, South China Normal University, Guangzhou 510006, P. R. China
| |
Collapse
|
2
|
Saha R, Das P, Chattaraj PK. A Complex Containing Four Magnesium Atoms and Two Mg–Mg Bonds Behaving as an Electride. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900813] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Ranajit Saha
- Department of Chemistry and Center for Theoretical Studies Indian Institute of Technology Kharagpur 721302 Kharagpur India
| | - Prasenjit Das
- Department of Chemistry and Center for Theoretical Studies Indian Institute of Technology Kharagpur 721302 Kharagpur India
| | - Pratim Kumar Chattaraj
- Department of Chemistry and Center for Theoretical Studies Indian Institute of Technology Kharagpur 721302 Kharagpur India
- Department of Chemistry Indian Institute of Technology Bombay 400076 Mumbai India
| |
Collapse
|
3
|
Saha R, Pan S, Merino G, Chattaraj PK. Unprecedented Bonding Situation in Viable E
2
(NHB
Me
)
2
(E=Be, Mg; NHB
Me
=(HCN
Me
)
2
B) Complexes: Neutral E
2
Forms a Single E−E Covalent Bond. Angew Chem Int Ed Engl 2019; 58:8372-8377. [DOI: 10.1002/anie.201900992] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Indexed: 11/09/2022]
Affiliation(s)
- Ranajit Saha
- Department of ChemistryIndian Institute of Technology Kharagpur Kharagpur 721302 India
| | - Sudip Pan
- Institute of Advanced SynthesisSchool of Chemistry and Molecular EngineeringNanjing Tech University Nanjing 211816 China
| | - Gabriel Merino
- Departamento de Física AplicadaCentro de Investigación y de Estudios Avanzados Unidad Mérida. Km 6 Antigua Carretera a Progreso.Apdo. Postal 73, Cordemex 97310 Mérida Yuc. México
| | - Pratim K. Chattaraj
- Department of ChemistryIndian Institute of Technology Kharagpur Kharagpur 721302 India
- Department of Chemistry and Center for Theoretical StudiesIndian Institute of Technology Bombay Mumbai 400076 India
| |
Collapse
|
4
|
Zaitsev SA, Steglenko DV, Minyaev RM, Minkin VI. Computer Modeling of Extended PnX3n + 2 Chains (X = F, Cl). RUSS J INORG CHEM+ 2019. [DOI: 10.1134/s0036023619060172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
5
|
Saha R, Pan S, Merino G, Chattaraj PK. Unprecedented Bonding Situation in Viable E 2(NHB Me) 2(E=Be, Mg; NHB Me=(HCN Me) 2B) Complexes: Neutral E 2Forms a Single E−E Covalent Bond. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201900992] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ranajit Saha
- Department of ChemistryIndian Institute of Technology Kharagpur Kharagpur 721302 India
| | - Sudip Pan
- Institute of Advanced SynthesisSchool of Chemistry and Molecular EngineeringNanjing Tech University Nanjing 211816 China
| | - Gabriel Merino
- Departamento de Física AplicadaCentro de Investigación y de Estudios Avanzados Unidad Mérida. Km 6 Antigua Carretera a Progreso.Apdo. Postal 73, Cordemex 97310 Mérida Yuc. México
| | - Pratim K. Chattaraj
- Department of ChemistryIndian Institute of Technology Kharagpur Kharagpur 721302 India
- Department of Chemistry and Center for Theoretical StudiesIndian Institute of Technology Bombay Mumbai 400076 India
| |
Collapse
|
6
|
Schleier D, Humeniuk A, Reusch E, Holzmeier F, Nunez-Reyes D, Alcaraz C, Garcia GA, Loison JC, Fischer I, Mitric R. Diborene: Generation and Photoelectron Spectroscopy of an Inorganic Biradical. J Phys Chem Lett 2018; 9:5921-5925. [PMID: 30234995 DOI: 10.1021/acs.jpclett.8b02338] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Diborenes, R-BB-R', are of current interest in inorganic chemistry because they offer the opportunity to tune the properties of a biradical by modifying the substituents of the diborene parent, HBBH. Here we synthesize the elusive diborene by H atom abstraction from diborane, B2H6, using fluorine atoms and report a vibrationally resolved photoelectron spectrum of the HBBH biradical. The spectrum is interpreted by comparison with high-level ab initio computations, taking into account the Renner-Teller splitting in the X+ 2Π ionic ground state, which show an excellent agreement with the experimental spectrum. An adiabatic ionization energy of 9.080 ± 0.015 eV was determined, and a vibrational progression in the boron-boron stretching vibration of 0.14 eV is visible. This is due to the reduction of bond order upon ionization, accompanied by an increase of the computed boron-boron bond length, RBB, from 1.514 to 1.606 Å.
Collapse
Affiliation(s)
- Domenik Schleier
- Institute of Physical and Theoretical Chemistry , University of Würzburg , Am Hubland, D-97074 Würzburg , Germany
| | - Alexander Humeniuk
- Institute of Physical and Theoretical Chemistry , University of Würzburg , Am Hubland, D-97074 Würzburg , Germany
| | - Engelbert Reusch
- Institute of Physical and Theoretical Chemistry , University of Würzburg , Am Hubland, D-97074 Würzburg , Germany
| | - Fabian Holzmeier
- Institut des Sciences Moléculaires d'Orsay, CNRS, Bât. 520 Université Paris-Sud and Paris-Saclay , F-91405 Orsay Cedex , France
| | - Dianailys Nunez-Reyes
- ISM-CNRS, Université de Bordeaux , 351 cours de la Libération , F-33405 Talence , France
| | - Christian Alcaraz
- LCP, UMR 800, CNRS-Univ. Paris-Sud and Paris Saclay, Bât. 350, Centre Universitaire Paris-Sud , F-91405 Orsay Cedex , France
| | - Gustavo A Garcia
- Synchrotron SOLEIL, L'Orme des Merisiers , St Aubin, B.P. 48 , F-91192 Gif sur Yvette , France
| | - Jean-Christophe Loison
- ISM-CNRS, Université de Bordeaux , 351 cours de la Libération , F-33405 Talence , France
| | - Ingo Fischer
- Institute of Physical and Theoretical Chemistry , University of Würzburg , Am Hubland, D-97074 Würzburg , Germany
| | - Roland Mitric
- Institute of Physical and Theoretical Chemistry , University of Würzburg , Am Hubland, D-97074 Würzburg , Germany
| |
Collapse
|
7
|
Li F, Aeberhard U, Wu H, Qiao M, Li Y. Global minimum beryllium hydride sheet with novel negative Poisson's ratio: first-principles calculations. RSC Adv 2018; 8:19432-19436. [PMID: 35540987 PMCID: PMC9080711 DOI: 10.1039/c8ra02492h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Accepted: 05/16/2018] [Indexed: 11/21/2022] Open
Abstract
As one of the most prominent metal-hydrides, beryllium hydride has received much attention over the past several decades, since 1978, and is considered as an important hydrogen storage material. By reducing the dimensionality from 3 to 2, the beryllium hydride monolayer is isoelectronic with graphene; thus the existence of its two-dimensional (2D) form is theoretically feasible and experimentally expected. However, little is known about its 2D form. In this work, by a global minimum search with the particle swarm optimization method via density functional theory computations, we predicted two new stable structures for the beryllium hydride sheets, named α-BeH2 and β-BeH2 monolayers. Both structures have more favorable thermodynamic stability than the recently reported planar square form (Nanoscale, 2017, 9, 8740), due to the forming of multicenter delocalized Be-H bonds. Utilizing the recently developed SSAdNDP method, we revealed that three-center-two-electron (3c-2e) delocalized Be-H bonds are formed in the α-BeH2 monolayer, while for the β-BeH2 monolayer, novel four-center-two-electron (4c-2e) delocalized bonds are observed in the 2D system for the first time. These unique multicenter chemical bonds endow both α- and β-BeH2 with high structural stabilities, which are further confirmed by the absence of imaginary modes in their phonon spectra, the favorable formation energies comparable to bulk and cluster beryllium hydride, and the high mechanical strength. These results indicate the potential for experimental synthesis. Furthermore, both α- and β-BeH2 are wide-bandgap semiconductors, in which the α-BeH2 has unusual mechanical properties with a negative Poisson's ratio of -0.19. If synthesized, it would attract interest both in experiment and theory, and be a new member of the 2D family isoelectronic with graphene.
Collapse
Affiliation(s)
- Feng Li
- School of Science, Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210023 China
- IEK-5 Photovoltaik, Forschungszentrum Jülich 52425 Jülich Germany
| | - Urs Aeberhard
- IEK-5 Photovoltaik, Forschungszentrum Jülich 52425 Jülich Germany
| | - Hong Wu
- School of Science, Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210023 China
| | - Man Qiao
- College of Chemistry and Materials Science, Jiangsu Key Laboratory of Biofunctional Materials, Nanjing Normal University Nanjing 210023 China
| | - Yafei Li
- College of Chemistry and Materials Science, Jiangsu Key Laboratory of Biofunctional Materials, Nanjing Normal University Nanjing 210023 China
| |
Collapse
|