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Kanazawa Y, Tsuji H, Ehara M, Fukuda R, Casher DL, Tamao K, Nakatsuji H, Michl J. Electronic Transitions in Conformationally Controlled Peralkylated Hexasilanes. Chemphyschem 2016; 17:3010-3022. [DOI: 10.1002/cphc.201600633] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Yuki Kanazawa
- SOKENDAI The Graduate University for Advanced Studies, Nishigonaka, Myodaiji Okazaki 444–8585 Japan
- Institute for Molecular Science and Research Center for Computational Science, Nishigonaka, Myodaiji Okazaki 444–8585 Japan
| | - Hayato Tsuji
- International Research Center for Elements Science (IRCELS) Institute for Chemical Research Kyoto University, Uji Kyoto 611-0011 Japan
- Department of Chemistry Faculty of Science Kanagawa University 2946 Tsuchiya Hiratsuka Kanagawa 259–1293 Japan
| | - Masahiro Ehara
- SOKENDAI The Graduate University for Advanced Studies, Nishigonaka, Myodaiji Okazaki 444–8585 Japan
- Institute for Molecular Science and Research Center for Computational Science, Nishigonaka, Myodaiji Okazaki 444–8585 Japan
- Elements Strategy Initiative for Catalysts and Batteries (ESICB) Kyoto University Kyoto 615–8520 Japan
| | - Ryoichi Fukuda
- Elements Strategy Initiative for Catalysts and Batteries (ESICB) Kyoto University Kyoto 615–8520 Japan
| | - Deborah L. Casher
- Department of Chemistry and Biochemistry University of Colorado at Boulder Boulder Colorado 80309-0215 USA
| | - Kohei Tamao
- International Research Center for Elements Science (IRCELS) Institute for Chemical Research Kyoto University, Uji Kyoto 611-0011 Japan
- RIKEN 2-1 Hirosawa Saitama 351-0198 Japan
| | - Hiroshi Nakatsuji
- Quantum Chemistry Research Institute Goryo Oohara 1–36, Nishikyo-ku Kyoto 615–8245 Japan
| | - Josef Michl
- Department of Chemistry and Biochemistry University of Colorado at Boulder Boulder Colorado 80309-0215 USA
- Institute of Organic Chemistry and Biochemistry Academy of Sciences of the Czech Republic Flemingovo nám. 2 16610 Prague Czech Republic
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Tsuji H, Fogarty HA, Ehara M, Fukuda R, Casher DL, Tamao K, Nakatsuji H, Michl J. Electronic transitions in conformationally controlled tetrasilanes with a wide range of SiSiSiSi dihedral angles. Chemistry 2014; 20:9431-41. [PMID: 25043859 DOI: 10.1002/chem.201403495] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Indexed: 11/08/2022]
Abstract
Unlike π-electron chromophores, the peralkylated n-tetrasilane σ-electron chromophore resembles a chameleon in that its electronic spectrum changes dramatically as its silicon backbone is twisted almost effortlessly from the syn to the anti conformation (changing the SiSiSiSi dihedral angle ω from 0 to 180°). A combination of UV absorption, magnetic circular dichroism (MCD), and linear dichroism (LD) spectroscopy on conformationally controlled tetrasilanes 1-9, which cover fairly evenly the full range of angles ω, permitted a construction of an experimental correlation diagram for three to four lowest valence electronic states. The free chain tetrasilane n-Si4 Me10 (10), normally present as a mixture of three enantiomeric conformer pairs of widely different angles ω, has also been included in our study. The spectral trends are interpreted in terms of avoided crossings of 1B with 2B and 2A with 3A states, in agreement with SAC-CI calculations on the excited states of 1-7 and conformers of 10.
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Affiliation(s)
- Hayato Tsuji
- International Research Center for Elements Science (IRCELS), Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011 (Japan); Present address: Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku,Tokyo 113-0033 (Japan)
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Malrieu JP, Caballol R, Calzado CJ, de Graaf C, Guihéry N. Magnetic interactions in molecules and highly correlated materials: physical content, analytical derivation, and rigorous extraction of magnetic Hamiltonians. Chem Rev 2013; 114:429-92. [PMID: 24102410 DOI: 10.1021/cr300500z] [Citation(s) in RCA: 282] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Jean Paul Malrieu
- Laboratoire de Chimie et Physique Quantiques, Université de Toulouse 3 , 118 route de Narbonne, 31062 Toulouse, France
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Excitation of Nucleobases from a Computational Perspective I: Reaction Paths. Top Curr Chem (Cham) 2013; 355:57-97. [DOI: 10.1007/128_2013_501] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Adrover M, Frau J, Caldés C, Vilanova B, Donoso J, Muñoz F. Theoretical and experimental study of the vertical excitation energies in the ionic and tautomeric forms of 4-aminomethylpyridine. J Photochem Photobiol A Chem 2010. [DOI: 10.1016/j.jphotochem.2009.10.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Piqueras MC, Crespo R, Michl J. Interpretation of the electronic spectra of four disilanes. J Phys Chem A 2008; 112:13095-101. [PMID: 18821735 DOI: 10.1021/jp804677v] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Time-dependent density functional theory (TD-DFT/B3LYP(AC)/cc-pVTZ/cc-pVTZ/6-311G//MP2/cc-pVTZ/cc-pVTZ/6-31G**) has been used to compute vertical excitation energies and oscillator strengths of the six low-lying excited states of four peralkylated disilanes, hexamethyldisilane (1), hexa-tert-butyldisilane (2), 1,6-disila[4.4.4]propellane (3), and 1,7-disila[5.5.5]propellane (4). The results provide an accurate interpretation of the reported UV absorption spectra of 1-4 in solution, and for 1 also in the gas phase up to 62,000 cm(-1). The excellent agreement of the calculated with the available experimental energies and oscillator strengths, and with magnetic circular (MCD) and linear (LD) dichroism, gives us confidence that the method will be useful for dependable interpretation of the electronic spectra of longer oligosilanes. Although the disilane chromophore finds itself in quite different environments in 1-4, its fundamental characteristics remain the same, with one important exception. In all four compounds, the first valence excited state is due to an electron promotion from the sigma(1) HOMO to the pi(1)* orbital, and the second valence excited state to a promotion from the sigma(1) HOMO to the sigma(1)* orbital. Surprisingly, however, it is only in 2, which has an extraordinarily long SiSi bond, that the terminating sigma(1)* orbital is the sigma*(SiSi) antibond, as anticipated, and the sigma sigma* transition has the expected very high oscillator strength. In 1, 3, and 4, the sigma*(SiSi) antibonding orbital is high in energy and does not play any role in low-energy excitations. Instead, the terminating orbital of the sigma(1)sigma(1)* excitation is represented by Si-alkyl antibonds, combined symmetrically with respect to rotation around the SiSi axis and antisymmetrically with respect to operations that interchange the two Si atoms. The common assumption that the characteristic intense sigma sigma* transitions of longer peralkylated oligosilanes extrapolate to the lowest sigma sigma* transition in common peralkylated disilanes is incorrect, and only the weak sigma pi* transitions extrapolate simply.
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Affiliation(s)
- Mari Carmen Piqueras
- Departament de Química Física, Universitat de València, Dr. Moliner 50, E-46100 Burjassot, Spain
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Rubio M, Serrano-Andrés L, Merchán M. Excited states of the water molecule: Analysis of the valence and Rydberg character. J Chem Phys 2008; 128:104305. [DOI: 10.1063/1.2837827] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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Sandström N, Piqueras MC, Ottosson H, Crespo R. Electronic excitations of 1,4-disilyl-substituted 1,4-disilabicycloalkanes: a MS-CASPT2 study of the influence of cage size. J Phys Chem A 2007; 111:2804-10. [PMID: 17388376 DOI: 10.1021/jp070010n] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We present a multistate complete active space second-order perturbation theory computational study aimed to predict the low-lying electronic excitations of four compounds that can be viewed as two disilane units connected through alkane bridges in a bicyclic cage. The analysis has focused on 1,4-disilyl-1,4-disilabicyclo[2.2.1]heptane (1a), 1,4-bis(trimethylsilyl)-1,4-disilabicyclo[2.2.1]heptane (1b), 1,4-disilyl-1,4-disilabicyclo[2.1.1]hexane (2a), and 1,4-bis(trimethylsilyl)-1,4-disilabicyclo[2.1.1]hexane (2b). The aim has been to find out the nature of the lowest excitations with significant oscillator strengths and to investigate how the cage size affects the excitation energies and the strengths of the transitions. Two different substituents on the terminal silicon atoms (H and CH3) were used in order to investigate the end group effects. The calculations show that the lowest allowed excitations are of the same character as that found in disilanes but now red-shifted. As the cage size is reduced from a 1,4-disilabicyclo[2.2.1]heptane to a 1,4-disilabicyclo[2.1.1]hexane, the Si...Si through-space distance decreases from approximately 2.70 to 2.50 A and the lowest allowed transitions are red-shifted by up to 0.9 eV, indicating increased interaction between the two Si-Si bonds. The first ionization potential, which corresponds to ionization from the Si-Si sigma orbitals, is lower in 1b and 2b than in Si2Me6 by approximately 0.9 and 1.2 eV, respectively. Moreover, 1b and 2b, which have methyl substituents at the terminal Si atoms, have slightly lower excitation energies than the analogous species 1a and 2a.
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Affiliation(s)
- Niclas Sandström
- Department of Biochemistry and Organic Chemistry, Box 576, Uppsala University, 751 23 Uppsala, Sweden
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Crespo R, Piqueras MC, Michl J. Electronic excitation in a syn-tetrasilane: 1,1,2,2,3,3, 4,4-octamethyltetrasilacyclopentane. Theor Chem Acc 2007. [DOI: 10.1007/s00214-007-0246-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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The electronic structures of all trans form of permethyl-oligosilane radical cation with longer chain: A density functional theory study. J Organomet Chem 2006. [DOI: 10.1016/j.jorganchem.2006.08.090] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Climent T, González-Luque R, Merchán M. Theoretical Analysis of the Excited States in Maleimide. J Phys Chem A 2003. [DOI: 10.1021/jp0225572] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Teresa Climent
- Departamento de Química Física, Instituto de Ciencia Molecular, Universitat de València, Dr. Moliner 50, Burjassot, ES-46100 Valencia, Spain
| | - Remedios González-Luque
- Departamento de Química Física, Instituto de Ciencia Molecular, Universitat de València, Dr. Moliner 50, Burjassot, ES-46100 Valencia, Spain
| | - Manuela Merchán
- Departamento de Química Física, Instituto de Ciencia Molecular, Universitat de València, Dr. Moliner 50, Burjassot, ES-46100 Valencia, Spain
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Piqueras MC, Crespo R, Michl J. The Transoid, Ortho, and Gauche Conformers of Decamethyl-n-tetrasilane, n-Si4Me10: Electronic Transitions in the Multistate Complete Active Space Second-Order Perturbation Theory Description. J Phys Chem A 2003. [DOI: 10.1021/jp022675p] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mari Carmen Piqueras
- Departament de Química Física i Institut de Ciència Molecular, Universitat de València, Dr. Moliner 50, E-46100 Burjassot (Valencia), Spain
| | - Raül Crespo
- Departament de Química Física i Institut de Ciència Molecular, Universitat de València, Dr. Moliner 50, E-46100 Burjassot (Valencia), Spain
| | - Josef Michl
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215
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Rooklin DW, Schepers T, Raymond-Johansson MK, Michl J. Time-dependent density functional theory treatment of the first UV absorption band in all-transoid permethyloligosilanes SinMe2n + 2 (n = 2-8, 10). Photochem Photobiol Sci 2003; 2:511-7. [PMID: 12803073 DOI: 10.1039/b302087h] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The TD B3LYP/6-311G(d,p) method slightly overestimates the excitation energies of the first UV absorption band of the all-transoid conformers of SinMe2n + 2 (n = 2-8, 10), deduced from temperature-dependent measurements on conformer mixtures in hydrocarbon solvents, by a nearly constant amount (approximately 2000 cm-1). The TD B3LYP/6-31G(d) results are less satisfactory. The first band is calculated to be due to a sigma pi * excitation in Si2Me6 and to a superposition of overlapping sigma sigma * and sigma pi * excitations in the longer oligosilanes. The sigma pi * excitation is calculated to lie a little below the sigma sigma * excitation up to Si4Me10, the two transitions are nearly degenerate in Si5Me12, and the sigma sigma * excitation drops increasingly below the sigma pi * as the chain length is extended. The dipole strength of the sigma sigma * excitation grows by 4.8 D2 (D = debye) per added SiSi bond (more slowly up to n = 5) and the calculation overestimates it by a factor of about three. The sigma pi * excitation is computed to carry no or almost no oscillator strength, but as noted earlier by others, its presence is critical for the interpretation of the observed thermochromism. Upon cooling below room temperature, the first absorption maximum is blue-shifted in short chains and red-shifted in long chains. Unlike the prior investigators, we attribute the blue shift to the disappearance of hot bands built on the sigma pi * origin using intensity borrowing sigma-pi mixing vibrations (b1 in Si3Me8). As usual, the red shift is attributed to the disappearance of twisted conformers, which have higher calculated sigma sigma * excitation energies.
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Affiliation(s)
- David W Rooklin
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309-0215, USA
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Casher DL, Tsuji H, Sano A, Katkevics M, Toshimitsu A, Tamao K, Kubota M, Kobayashi T, Ottosson CH, David DE, Michl J. The Disilane Chromophore: Photoelectron and Electronic Spectra of Hexaalkyldisilanes and 1,(n+2)-Disila[n.n.n]propellanes. J Phys Chem A 2003. [DOI: 10.1021/jp027380q] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Deborah L. Casher
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80302-0215, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan, School of Medicine, Keio University, Hiyoshi-4, Kohoku, Yokohama 223-8521, Japan, and Department of Organic Chemistry, Institute of Chemistry, Box 531, Uppsala University, 751 21 Uppsala, Sweden
| | - Hayato Tsuji
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80302-0215, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan, School of Medicine, Keio University, Hiyoshi-4, Kohoku, Yokohama 223-8521, Japan, and Department of Organic Chemistry, Institute of Chemistry, Box 531, Uppsala University, 751 21 Uppsala, Sweden
| | - Atsushi Sano
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80302-0215, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan, School of Medicine, Keio University, Hiyoshi-4, Kohoku, Yokohama 223-8521, Japan, and Department of Organic Chemistry, Institute of Chemistry, Box 531, Uppsala University, 751 21 Uppsala, Sweden
| | - Martins Katkevics
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80302-0215, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan, School of Medicine, Keio University, Hiyoshi-4, Kohoku, Yokohama 223-8521, Japan, and Department of Organic Chemistry, Institute of Chemistry, Box 531, Uppsala University, 751 21 Uppsala, Sweden
| | - Akio Toshimitsu
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80302-0215, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan, School of Medicine, Keio University, Hiyoshi-4, Kohoku, Yokohama 223-8521, Japan, and Department of Organic Chemistry, Institute of Chemistry, Box 531, Uppsala University, 751 21 Uppsala, Sweden
| | - Kohei Tamao
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80302-0215, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan, School of Medicine, Keio University, Hiyoshi-4, Kohoku, Yokohama 223-8521, Japan, and Department of Organic Chemistry, Institute of Chemistry, Box 531, Uppsala University, 751 21 Uppsala, Sweden
| | - Mari Kubota
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80302-0215, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan, School of Medicine, Keio University, Hiyoshi-4, Kohoku, Yokohama 223-8521, Japan, and Department of Organic Chemistry, Institute of Chemistry, Box 531, Uppsala University, 751 21 Uppsala, Sweden
| | - Tsunetoshi Kobayashi
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80302-0215, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan, School of Medicine, Keio University, Hiyoshi-4, Kohoku, Yokohama 223-8521, Japan, and Department of Organic Chemistry, Institute of Chemistry, Box 531, Uppsala University, 751 21 Uppsala, Sweden
| | - C. Henrik Ottosson
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80302-0215, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan, School of Medicine, Keio University, Hiyoshi-4, Kohoku, Yokohama 223-8521, Japan, and Department of Organic Chemistry, Institute of Chemistry, Box 531, Uppsala University, 751 21 Uppsala, Sweden
| | - Donald E. David
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80302-0215, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan, School of Medicine, Keio University, Hiyoshi-4, Kohoku, Yokohama 223-8521, Japan, and Department of Organic Chemistry, Institute of Chemistry, Box 531, Uppsala University, 751 21 Uppsala, Sweden
| | - Josef Michl
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80302-0215, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan, School of Medicine, Keio University, Hiyoshi-4, Kohoku, Yokohama 223-8521, Japan, and Department of Organic Chemistry, Institute of Chemistry, Box 531, Uppsala University, 751 21 Uppsala, Sweden
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Piqueras MC, Merchán M, Crespo R, Michl J. Conformational Effects on the Ultraviolet Absorption Spectrum ofn-Tetrasilane: Multistate Complete Active Space Second-Order Perturbation Theory Treatment†. J Phys Chem A 2002. [DOI: 10.1021/jp020460+] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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17
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Roos BO, Malmqvist PÅ, Molina V, Serrano-Andrés L, Merchán M. Theoretical characterization of the lowest-energy absorption band of pyrrole. J Chem Phys 2002. [DOI: 10.1063/1.1465406] [Citation(s) in RCA: 107] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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PIQUERAS MARICARMEN, CRESPO RAÜL, MICHL JOSEF. Multiconfigurational second-order perturbation calculation of the electronic absorption spectrum of trisilane, Si3H8. Mol Phys 2002. [DOI: 10.1080/00268970110095147] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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19
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Schepers T, Michl J. Optimized ladder C and ladder H models for sigma conjugation: chain segmentation in polysilanes. J PHYS ORG CHEM 2002. [DOI: 10.1002/poc.527] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Pou-Amérigo R, Ortí E, Merchán M, Rubio M, Viruela PM. Electronic Transitions in Tetrathiafulvalene and Its Radical Cation: A Theoretical Contribution. J Phys Chem A 2001. [DOI: 10.1021/jp013634g] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rosendo Pou-Amérigo
- Departament de Química Física, Institut de Ciència Molecular, Universitat de València, Dr. Moliner 50, E−46100 Burjassot (València), Spain
| | - Enrique Ortí
- Departament de Química Física, Institut de Ciència Molecular, Universitat de València, Dr. Moliner 50, E−46100 Burjassot (València), Spain
| | - Manuela Merchán
- Departament de Química Física, Institut de Ciència Molecular, Universitat de València, Dr. Moliner 50, E−46100 Burjassot (València), Spain
| | - Mercedes Rubio
- Departament de Química Física, Institut de Ciència Molecular, Universitat de València, Dr. Moliner 50, E−46100 Burjassot (València), Spain
| | - Pedro M. Viruela
- Departament de Química Física, Institut de Ciència Molecular, Universitat de València, Dr. Moliner 50, E−46100 Burjassot (València), Spain
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Rozgonyi T, Feurer T, González L. A MS-CASPT2 study of the low-lying electronic excited states of CH2BrCl. Chem Phys Lett 2001. [DOI: 10.1016/s0009-2614(01)01273-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Reinartz S, Baik MH, White PS, Brookhart M, Templeton JL. Synthesis, structure, and electronic properties of monomeric and dimeric trispyrazolylborate platinum(II) hydride complexes. Inorg Chem 2001; 40:4726-32. [PMID: 11511222 DOI: 10.1021/ic010099q] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Tp'PtMe(H)2 (2) [Tp' = hydridotris(3,5-dimethylpyrazolyl)borate] has been prepared from Tp'PtMe(CO) (1) via reaction with water in a basic acetone/water mixture. Protonation of 2 at one of the pyrazole nitrogen atoms induces methane elimination, and the resulting platinum(II) monohydride solvent intermediate (3) can be trapped by added ligand. Two chiral cationic platinum(II) monohydride complexes of the type [kappa(2)-((Hpz)BHpz2)Pt(H)(L)][BAr'4] [L = MeCN (4), CH2=CH2 (5); pz = 3,5-dimethylpyrazolyl, BAr'4 = tetrakis(3,5-trifluoromethylphenyl)borate] have been isolated. If 2 is protonated in the absence of trapping ligand, a deep red hydride-bridged dinuclear complex, [kappa(2)-((Hpz)BHpz2)Pt(mu-H)]2[BAr'4]2 (6), forms. DFT calculations supplement intuitive expectations regarding 3-center-2-electron bridging orbital descriptions for the electronic structure of this complex. X-ray structure determinations for the monomeric acetonitrile adduct 4 and the dicationic dimer 6 are reported.
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Affiliation(s)
- S Reinartz
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, USA
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Tsuji H, Toshimitsu A, Tamao K, Michl J. UV, MCD, and LD Spectra of a Conformationally Constrained ortho-Tetrasilane: Support for the Avoided Crossing Model of Conformational Effects on Excited States. J Phys Chem A 2001. [DOI: 10.1021/jp010792z] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hayato Tsuji
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Akio Toshimitsu
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Kohei Tamao
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Josef Michl
- Department of Chemistry and Biochemistry, University of Colorado at Boulder, Boulder, Colorado 80309-0215
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