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Wu H, Jia Y, Zhao X, Geng L, Lin S, Li SD, Luo Z. To What Extent Do Iodomethane and Bromomethane Undergo Analogous Reactions? J Phys Chem A 2024; 128:1274-1279. [PMID: 38334079 DOI: 10.1021/acs.jpca.3c08337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2024]
Abstract
Iodomethane and bromomethane (CH3I/CH3Br) are common chemicals, but their chemistry on nanometals is not fully understood. Here, we analyze the reactivity of Rhn+ (n = 3-30) clusters with halomethanes and unveil the spin effect and concentration dependence in the C-H and C-X bond activation. It is found that the reactions under halomethane-rich conditions differ from those under metal-rich conditions. Both CH3I and CH3Br undergo similar dehydrogenation on the Rhn+ clusters in the presence of small quantity reactants; however, different reactions are observed in the presence of sufficient CH3I/CH3Br, showing dominant Rh(CH3Br)x+ (x = 1-4) products but a series of RhnCxHyIz+ species (x = 1-4, y = 1-12, and z = 1-5) pertaining to H2, HI, or CH4 removal. Density functional theory calculations reveal that the dehydrogenation and demethanation of CH3Br are relatively less exothermic and will be deactivated by sufficient gas collisions if helium cooling takes away energy immediately; instead, the successive adsorption of CH3Br gives rise to a series of Rh(CH3Br)x+ species with accidental C-Br bond dissociation.
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Affiliation(s)
- Haiming Wu
- Beijing National Laboratory for Molecular Science (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Yuhan Jia
- Beijing National Laboratory for Molecular Science (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Xiaoyun Zhao
- Institute of Molecular Science, Shanxi University, Taiyuan 030006, China
- Department of Applied Chemistry, Yuncheng University, Yuncheng 044000, China
| | - Lijun Geng
- Beijing National Laboratory for Molecular Science (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Shiquan Lin
- Beijing National Laboratory for Molecular Science (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Si-Dian Li
- Institute of Molecular Science, Shanxi University, Taiyuan 030006, China
| | - Zhixun Luo
- Beijing National Laboratory for Molecular Science (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- School of Chemistry, University of Chinese Academy of Sciences, Beijing 100049, China
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Tracing photoionisation behaviour of methyl iodide in gas phase: From isolated molecule to molecular aggregate. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2017. [DOI: 10.1016/j.jphotochemrev.2017.09.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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de Nalda R, Durá J, González-Vázquez J, Loriot V, Bañares L. The primary step in the ultrafast photodissociation of the methyl iodide dimer. Phys Chem Chem Phys 2011; 13:13295-304. [DOI: 10.1039/c1cp20083f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Zhang XP, Lee WB, Zhao DF, Hsiao MK, Chen YL, Lin KC. Photodissociation of (ICN)2 van der Waals dimer using velocity imaging technique. J Chem Phys 2009; 130:214305. [DOI: 10.1063/1.3148376] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Wei ZR, Zhang F, Wang YM, Zhang B. Predissociation Dynamics of B State of Methyl Iodide with Femtosecond Pump-probe Technique. CHINESE J CHEM PHYS 2007. [DOI: 10.1088/1674-0068/20/04/419-424] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Vidma KV, Baklanov AV, Zhang Y, Parker DH. Ultraviolet photodissociation of the van der Waals dimer (CH3I)2 revisited. II. Pathways giving rise to neutral molecular iodine. J Chem Phys 2006; 125:133303. [PMID: 17029456 DOI: 10.1063/1.2345365] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The formation of neutral I2 by the photodissociation of the methyl iodide dimer, (CH3I)2, excited within the A band at 249.5 nm is evaluated using velocity map imaging. In previous work [J. Chem. Phys. 122, 204301 (2005)], we showed that the formation of I2+ from photodissociation of the methyl iodide dimer takes place via ionic channels (through the formation of (CH3I)2+). It is thus not possible to detect neutral I2 by monitoring I2+. Neutral I2 is detected in this study by monitoring I atoms arising from the photodissociation of I2. Iodine atoms from I2 photodissociation have a characteristic kinetic energy and angular anisotropy, which is registered using velocity map imaging. We use a two-color probe scheme involving the photodissociation of nascent I2 at 499 nm, which gives rise to I atoms that are ionized by (2+1) resonance enhanced multiphoton ionization at 304.67 nm. Our estimate of the yield of nascent I2 is based on the comparison with the signal from I2 at a known concentration. Using molecular beams with a small fraction of CH3I (1% in the expanded mixture) where smaller clusters should prevail, the production of I2 was found to be negligible. An upper estimate for the quantum yield of I2 from (CH3I)2 dimers was found to be less than 0.4%. Experiments with a higher fraction of CH3I (4% in the expanded mixture), which favor the formation of larger clusters, revealed an observable formation of I2, with an estimated translational temperature of about 820 K. We suggest that this observed I2 signal arises from the photodissociation of several CH3I molecules in the larger cluster by the same UV pulse, followed by recombination of two nascent iodine atoms is responsible for neutral I2 production.
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Affiliation(s)
- Konstantin V Vidma
- Institute of Chemical Kinetics and Combustion, Institutskaja Street 3, Novosibirsk 630090, Russia and Novosibirsk State University, Novosibirsk 630090, Russia
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Vidma KV, Baklanov AV, Khvorostov EB, Ishchenko VN, Kochubei SA, Eppink ATJB, Chestakov DA, Parker DH. UV photodissociation of the van der Waals dimer (CH3I)2 revisited: Pathways giving rise to ionic features. J Chem Phys 2005; 122:204301. [PMID: 15945718 DOI: 10.1063/1.1909083] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The CH(3)I A-state-assisted photofragmentation of the (CH(3)I)(2) van der Waals dimer at 248 nm and nearby wavelengths has been revisited experimentally using the time-of-flight mass spectrometry with supersonic and effusive molecular beams and the "velocity map imaging" technique. The processes underlying the appearance of two main (CH(3)I)(2) cluster-specific features in the mass spectra, namely, I(2)(+) and translationally "hot" I(+) ions, have been studied. Translationally hot I(+) ions with an average kinetic energy of 0.94+/-0.02 eV appear in the one-quantum photodissociation of vibrationally excited I(2)(+)((2)Pi(32,g)) ions (E(vib)=0.45+/-0.11 eV) via a "parallel" photodissociation process with an anisotropy parameter beta=1.55+/-0.03. Comparison of the images of I(+) arising from the photoexcitation of CH(3)I clusters versus those from neutral I(2) shows that "concerted" photodissociation of the ionized (CH(3)I)(2)(+) dimer appears to be the most likely mechanism for the formation of molecular iodine ion I(2)(+), instead of photoionization of neutral molecular iodine.
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Affiliation(s)
- Konstantin V Vidma
- Institute of Chemical Kinetics and Combustion, Institutskaja Street 3, Novosibirsk 630090, Russia
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Knappenberger KL, Castleman AW. The influence of cluster formation on the photodissociation of sulfur dioxide: Excitation to the E state. J Chem Phys 2004; 121:3540-9. [PMID: 15303919 DOI: 10.1063/1.1767091] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
A femtosecond pump-probe technique was employed to study the dissociation dynamics of sulfur dioxide and sulfur dioxide clusters in real time. Dissociation is initiated by a multiphoton scheme that populates the E state. The SO(2) (+) transient is fit to a biexponential decay comprising a fast and a slow component of 230 fs and 8 ps, respectively. The SO(+) transient consists of a growth component of 225 fs as well as a subsequent decay of 373 fs. The pump-probe response obtained from the monomer clearly shows the predissociative cleavage of a S-O bond. Upon cluster formation, a sequential increase in the fast decay component is observed for increasing cluster size, extending to 435 fs for (SO(2))(4) (+). The transient response of cluster dissociation products SO(SO(2))(n) (+), where n=1-3, reflects no growth component indicating that formation proceeds through the ion state. Therefore, cluster formation results in a caging effect, which impedes the dissociation process. Further direct evidence for our proposed mechanism is obtained by a technique that employs a comparison of the amplitude coefficients of each respective component of the fit. This method makes possible the determination of branching ratios of competing relaxation processes and thereby the influence of cluster formation on each can be resolved. The caging effect is attributed to a steric hindrance placed on the SO(2) chromophore, preventing it from attaining a linear geometry necessary for dissociation.
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Affiliation(s)
- K L Knappenberger
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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Affiliation(s)
- T E Dermota
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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Baklanov AV, Bogdanchikov GA, Aldener M, Sassenberg U, Persson A. Nanosecond and femtosecond probing of the dynamics of the UV-photodissociation of perfluoroethyliodide C2F5I. J Chem Phys 2001. [DOI: 10.1063/1.1418743] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Fidder H, Tschirschwitz F, Dühr O, Nibbering ETJ. Vibrational mode-specific photochemical reaction dynamics of chlorine dioxide in solution. J Chem Phys 2001. [DOI: 10.1063/1.1357202] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Zhong Q, Castleman AW. An ultrafast glimpse of cluster solvation effects on reaction dynamics. Chem Rev 2000; 100:4039-58. [PMID: 11749339 DOI: 10.1021/cr990056f] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Q Zhong
- Departments of Chemistry and Physics, The Pennsylvania State University, University Park, Pennsylvania 16802
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Trushin SA, Fuss W, Kompa KL, Schmid WE. Femtosecond Dynamics of Fe(CO)5 Photodissociation at 267 nm Studied by Transient Ionization. J Phys Chem A 2000. [DOI: 10.1021/jp992474u] [Citation(s) in RCA: 92] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- S. A. Trushin
- Max-Planck-Institut für Quantenoptik, D-85740 Garching, Germany, and B.I. Stepanov Institute of Physics, Belarus Academy of Sciences, 220602 Minsk, Belarus
| | - W. Fuss
- Max-Planck-Institut für Quantenoptik, D-85740 Garching, Germany, and B.I. Stepanov Institute of Physics, Belarus Academy of Sciences, 220602 Minsk, Belarus
| | - K. L. Kompa
- Max-Planck-Institut für Quantenoptik, D-85740 Garching, Germany, and B.I. Stepanov Institute of Physics, Belarus Academy of Sciences, 220602 Minsk, Belarus
| | - W. E. Schmid
- Max-Planck-Institut für Quantenoptik, D-85740 Garching, Germany, and B.I. Stepanov Institute of Physics, Belarus Academy of Sciences, 220602 Minsk, Belarus
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Choi YK, Koo YM, Jung KW. Multiphoton ionization and fragmentation processes of methyl iodide clusters at 266 and 355 nm. J Photochem Photobiol A Chem 1999. [DOI: 10.1016/s1010-6030(99)00151-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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McCarter BE, Bililign S, Feigerle CS, Miller JC. Nanochemistry: Iron Cluster Reactions with Methyl Iodide. J Phys Chem A 1999. [DOI: 10.1021/jp991380h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- B. E. McCarter
- Biochemistry and Biophysics Section, Life Sciences, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6125, and Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996
| | - S. Bililign
- Biochemistry and Biophysics Section, Life Sciences, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6125, and Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996
| | - C. S. Feigerle
- Biochemistry and Biophysics Section, Life Sciences, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6125, and Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996
| | - John C. Miller
- Biochemistry and Biophysics Section, Life Sciences, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6125, and Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996
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Ford JV, Zhong Q, Poth L, Castleman AW. Femtosecond laser interactions with methyl iodide clusters. I. Coulomb explosion at 795 nm. J Chem Phys 1999. [DOI: 10.1063/1.478530] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Zhong Q, Poth L, Castleman AW. Ultrafast dissociation dynamics of acetone: A revisit to the S1 state and 3s Rydberg state. J Chem Phys 1999. [DOI: 10.1063/1.478793] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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