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Synthesis, characterization and gas phase conformational properties of chlorodifluoroacetylsulfenyl chloride, CF2ClC(O)SCl. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Bava YB, Cozzarín MV, Della Védova CO, Willner H, Romano RM. Preparation of FC(S)SF, FC(S)SeF and FC(Se)SeF through matrix photochemical reactions of F 2 with CS 2, SCSe, and CSe 2. Phys Chem Chem Phys 2021; 23:20892-20900. [PMID: 34528659 DOI: 10.1039/d1cp03764a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactions of F2 with CS2, SCSe, and CSe2, respectively, were analyzed under matrix conditions by co-deposition of the halogen with the triatomic molecules trapped in argon matrices at cryogenic temperatures. In all cases, after co-deposition, the formation of the respective van der Waals complexes is observed. When each mixture is subsequently irradiated by means of broad-band UV-visible light (200 ≤ λ ≤ 800 nm), FC(S)SF, fluorothiocarbonylsulfenyl fluoride, FC(S)SeF, fluorothiocarbonylselenyl fluoride and FC(Se)SeF, fluoroselenocarbonylselenyl fluoride are produced, respectively. All these species exist as two stable planar syn- and anti-conformers (syn- and anti- of the CZ double bond, Y = S, Se, with respect to the S-F or Se-F single bond, respectively). For FC(S)SF, syn- is the rotamer with the lowest energy, while for both FC(S)SeF and FC(Se)SeF the anti-form is the lowest energy conformer. In all cases, other products due to alternative or subsequent photochannels are observed during the photochemical processes carried out in argon matrices at cryogenic temperatures.
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Affiliation(s)
- Yanina B Bava
- CEQUINOR (UNLP, CCT-CONICET La Plata, associated with CIC), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Blvd. 120 No. 1465, CC 962, La Plata, CP 1900, Argentina.
| | - Melina V Cozzarín
- CEQUINOR (UNLP, CCT-CONICET La Plata, associated with CIC), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Blvd. 120 No. 1465, CC 962, La Plata, CP 1900, Argentina.
| | - Carlos O Della Védova
- CEQUINOR (UNLP, CCT-CONICET La Plata, associated with CIC), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Blvd. 120 No. 1465, CC 962, La Plata, CP 1900, Argentina.
| | - Helge Willner
- Anorganische Chemie, Bergische Universität Wuppertal, Gaußstr. 20, D-42097 Wuppertal, Germany
| | - Rosana M Romano
- CEQUINOR (UNLP, CCT-CONICET La Plata, associated with CIC), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Blvd. 120 No. 1465, CC 962, La Plata, CP 1900, Argentina.
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Dirican D, Pfister N, Wozniak M, Braun T. Reactivity of Binary and Ternary Sulfur Halides towards Transition-Metal Compounds. Chemistry 2020; 26:6945-6963. [PMID: 31840851 PMCID: PMC7318666 DOI: 10.1002/chem.201904493] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Indexed: 11/23/2022]
Abstract
Binary sulfur fluorides exhibit an interesting reactivity towards transition metal complexes. They open up routes for the generation of sulfur‐containing building blocks. Often ligands with particular properties can be constructed. This includes their ability to transfer sulfur atoms or polysulfide units as well as fluorination reactions. This Minireview provides an insight into the reactivity of the binary and ternary sulfur halides S2Cl2, SCl2, SF4, SF6 and SF5Cl towards transition‐metal compounds.
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Affiliation(s)
- Dilcan Dirican
- Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Strasse 2, 12489, Berlin, Germany
| | - Nils Pfister
- Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Strasse 2, 12489, Berlin, Germany
| | - Martin Wozniak
- Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Strasse 2, 12489, Berlin, Germany
| | - Thomas Braun
- Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Strasse 2, 12489, Berlin, Germany
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Chloro- and Dichloro-methylsulfonyl Nitrenes: Spectroscopic Characterization, Photoisomerization, and Thermal Decomposition. Molecules 2018; 23:molecules23123312. [PMID: 30551679 PMCID: PMC6321523 DOI: 10.3390/molecules23123312] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Revised: 12/11/2018] [Accepted: 12/12/2018] [Indexed: 12/18/2022] Open
Abstract
Chloro- and dichloro-methylsulfonyl nitrenes, CH₂ClS(O)₂N and CHCl₂S(O)₂N, have been generated from UV laser photolysis (193 and 266 nm) of the corresponding sulfonyl azides CH₂ClS(O)₂N₃ and CHCl₂S(O)₂N₃, respectively. Both nitrenes have been characterized with matrix-isolation IR and EPR spectroscopy in solid N₂ (10 K) and glassy toluene (5 K) matrices. Triplet ground-state multiplicity of CH₂ClS(O)₂N (|D/hc| = 1.57 cm-1 and |E/hc| = 0.0026 cm-1) and CHCl₂S(O)₂N (|D/hc| = 1.56 cm-1 and |E/hc| = 0.0042 cm-1) has been confirmed. In addition, dichloromethylnitrene CHCl₂N (|D/hc| = 1.57 cm-1 and |E/hc| = 0 cm-1), formed from SO₂-elimination in CHCl₂S(O)₂N, has also been identified for the first time. Upon UV light irradiation (365 nm), the two sulfonyl nitrenes R⁻S(O)₂N (R = CH₂Cl and CHCl₂) undergo concomitant 1,2-R shift to N-sulfonlyamines R⁻NSO₂ and 1,2-oxygen shift to S-nitroso compounds R⁻S(O)NO, respectively. The identification of these new species with IR spectroscopy is supported by 15N labeling experiments and quantum chemical calculations at the B3LYP/6-311++G(3df,3pd) level. In contrast, the thermally-generated sulfonyl nitrenes CH₂ClS(O)₂N (600 K) and CHCl₂S(O)₂N (700 K) dissociate completely in the gas phase, and in both cases, HCN, SO₂, HCl, HNSO, and CO form. Additionally, ClCN, OCCl₂, HNSO₂, •NSO₂, and the atmospherically relevant radical •CHCl₂ are also identified among the fragmentation products of CHCl₂S(O)₂N. The underlying mechanisms for the rearrangement and decomposition of CH₂ClS(O)₂N and CHCl₂S(O)₂N are discussed based on the experimentally-observed products and the calculated potential energy profile.
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Amicangelo JC, Lee YP. Infrared Spectra of the 1-Chloromethyl-1-methylallyl and 1-Chloromethyl-2-methylallyl Radicals Isolated in Solid para-Hydrogen. J Phys Chem A 2017; 121:8771-8784. [DOI: 10.1021/acs.jpca.7b07922] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jay C. Amicangelo
- School
of Science, Penn State Erie, The Behrend College, 4205 College
Drive, Erie, Pennsylvania 16563, United States
| | - Yuan-Pern Lee
- Department
of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu 30010, Taiwan
- Institute
of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan
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Bava YB, Tamone LM, Juncal LC, Seng S, Tobón YA, Sobanska S, Picone AL, Romano RM. Gas-phase and matrix-isolation photochemistry of methyl thioglycolate, CH 3 OC(O)CH 2 SH: Influence of the presence of molecular oxygen in the photochemical mechanisms. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2017.05.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Bahou M, Das P, Lee YF, Wu YJ, Lee YP. Infrared spectra of free radicals and protonated species produced in para-hydrogen matrices. Phys Chem Chem Phys 2014; 16:2200-10. [DOI: 10.1039/c3cp54184c] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Bahou M, Das P, Lee YF, Wu YJ, Lee YP. Infrared spectra of free radicals and protonated species produced in para-hydrogen matrices. Phys Chem Chem Phys 2014. [DOI: 10.10.1039/c3cp54184c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Bahou M, Huang CW, Huang YL, Glatthaar J, Lee YP. Advances in Use ofp-H2as a Novel Host for Matrix IR Spectroscopy. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.201000107] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Young NA. Main group coordination chemistry at low temperatures: A review of matrix isolated Group 12 to Group 18 complexes. Coord Chem Rev 2013. [DOI: 10.1016/j.ccr.2012.10.013] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Cozzarín MV, Romano RM, Willner H, Della Védova CO. Matrix isolation of the elusive fluorocarbonylsulfenyl fluoride molecule FC(O)SF. J Phys Chem A 2013; 117:855-62. [PMID: 23267691 DOI: 10.1021/jp309310n] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The syn and anti conformers of the hitherto unknown fluorocarbonylsulphenyl fluoride FC(O)SF were formed through the photochemical reactions between OCS and F(2), isolated in solid Ar. The reactions were followed by Fourier transform infrared (FTIR) spectroscopy, and the unknown products were proposed by comparison of the observed IR absorptions with their computed IR spectra. The reactions occur through a 1:1 molecular complex between OCS and F(2), forming the anti-FC(O)SF first, which subsequently transforms into the syn form, through a randomization process. At longer times of irradiation, FC(O)SF decomposes by extrusion of a CO molecule with the concomitant formation of SF(2) and the formation of a difluorophosgene molecule, O═CF(2). The migration of fluorine atoms in the matrixes is proposed to explain the formation of SF(4) and SF(6).
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Affiliation(s)
- Melina V Cozzarín
- CEQUINOR (UNLP-CONICET), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 47 esq. 115, (1900) La Plata, Argentina
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Lapere KM, LaMacchia RJ, Quak LH, Kettner M, Dale SG, McKinley AJ, Wild DA. Anion Photoelectron Spectra and Ab Initio Calculations of the Iodide–Carbon Monoxide Clusters: I–···(CO)n, n = 1–4. J Phys Chem A 2012; 116:3577-84. [DOI: 10.1021/jp300471x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kim M. Lapere
- School of Chemistry and Biochemistry, The University of Western Australia,
M313 35 Stirling Highway, Crawley, 6009, Western Australia, Australia
| | - Robert J. LaMacchia
- School of Chemistry and Biochemistry, The University of Western Australia,
M313 35 Stirling Highway, Crawley, 6009, Western Australia, Australia
| | - Lin H. Quak
- School of Chemistry and Biochemistry, The University of Western Australia,
M313 35 Stirling Highway, Crawley, 6009, Western Australia, Australia
| | - Marcus Kettner
- School of Chemistry and Biochemistry, The University of Western Australia,
M313 35 Stirling Highway, Crawley, 6009, Western Australia, Australia
| | - Stephen G. Dale
- School of Chemistry and Biochemistry, The University of Western Australia,
M313 35 Stirling Highway, Crawley, 6009, Western Australia, Australia
| | - Allan J. McKinley
- School of Chemistry and Biochemistry, The University of Western Australia,
M313 35 Stirling Highway, Crawley, 6009, Western Australia, Australia
| | - Duncan A. Wild
- School of Chemistry and Biochemistry, The University of Western Australia,
M313 35 Stirling Highway, Crawley, 6009, Western Australia, Australia
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Lapere KM, LaMacchia RJ, Quak LH, Kettner M, Dale SG, McKinley AJ, Wild DA. The Bromide - Carbon Monoxide Gas Phase Complex: Anion Photoelectron Spectroscopy and Ab Initio Calculations. Aust J Chem 2012. [DOI: 10.1071/ch12007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The anion photoelectron spectrum of the bromide–carbon monoxide complex is presented in combination with supporting ab initio calculations. The spectrum features transitions between anion and neutral van der Waals complexes, Br⋯CO. A stabilization energy of 0.14 ± 0.05 eV is extracted from the spectrum, while the predicted binding energy for the anion complex is 9.9 kJ mol–1 from CCSD(T)/aug-cc-pVTZ calculations. The electron affinity of the Br⋯CO complex is 3.50 ± 0.05 eV. The ab initio calculations reveal a previously unreported minimum for the neutral radical complex, namely the van der Waals Br⋯OC linear complex.
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Amicangelo JC, Golec B, Bahou M, Lee YP. Infrared spectrum of the 2-chloroethyl radical in solid para-hydrogen. Phys Chem Chem Phys 2012; 14:1014-29. [DOI: 10.1039/c1cp22524c] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Golec B, Lee YP. Reactions between chlorine atom and acetylene in solid para-hydrogen: Infrared spectrum of the 1-chloroethyl radical. J Chem Phys 2011; 135:174302. [DOI: 10.1063/1.3653988] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Lapere K, LaMacchia R, Quak L, McKinley A, Wild D. Anion photoelectron spectroscopy and ab initio calculations of the gas phase chloride–carbon monoxide complex: Cl−⋯CO. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2011.01.034] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Huang CW, Lee YC, Lee YP. Diminished cage effect in solid p-H2: Infrared spectra of ClSCS, ClCS, and ClSC in an irradiated p-H2 matrix containing Cl2 and CS2. J Chem Phys 2010; 132:164303. [DOI: 10.1063/1.3386578] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Picone AL, Della Védova CO, Willner H, Downs AJ, Romano RM. Experimental and theoretical characterization of molecular complexes formed between OCS and XY molecules (X, Y = F, Cl and Br) and their role in photochemical matrix reactions. Phys Chem Chem Phys 2010; 12:563-71. [DOI: 10.1039/b914862k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Gómez Castaño JA, Romano RM, Willner H, Della Védova CO. Preparation of the novel XC(O)SeX species (X=Cl, Br) through matrix photochemical reactions of OCSe with Cl2 and Br2 at cryogenic temperatures. Inorganica Chim Acta 2008. [DOI: 10.1016/j.ica.2007.05.060] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Gómez Castaño JA, Picone AL, Romano RM, Willner H, Della Védova CO. Early Barriers in the Matrix Photochemical Formation ofsyn–anti Randomized FC(O)SeF from the OCSe:F2 Complex. Chemistry 2007; 13:9355-61. [PMID: 17696184 DOI: 10.1002/chem.200700378] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The photochemically induced reaction of OCSe and F(2), isolated together in an Ar matrix at about 15 K, leads to formation of the hitherto-unknown fluorocarbonylselenyl fluoride FC(O)SeF. The reaction occurs via a van der Waals complex O=C=Se...F-F that favors very early formation of the anti conformer. The presence and subsequent decay of a band assigned to the F-F vibration correlated with perturbed OCSe bands seems to confirm this hypothesis. Subsequent irradiation of the matrix leads to randomized FC(O)SeF by a photochemically induced conformational equilibrium between syn and anti forms. Another photochemical reaction channel is the formation of CO and SeF(2) molecules, which are produced in the same matrix cage and then form a loose complex. The changes were monitored and the products characterized experimentally by their IR spectra, and the spectra analyzed in the light of the results of theoretical calculations.
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Affiliation(s)
- Jovanny A Gómez Castaño
- CEQUINOR (UNLP-CONICET), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 47 esq 115, (1900), La Plata, Argentina
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Romano RM, Della Védova CO, Downs AJ. Methanesulfenyl Fluoride, CH3SF, a Missing Link in the Family of Sulfenyl Halides: Formation and Characterization through the Matrix Photochemistry of Methyl Thiofluoroformate, FC(O)SCH3. Chemistry 2007; 13:8185-92. [PMID: 17639538 DOI: 10.1002/chem.200700118] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Matrix-isolation experiments have afforded the means of preparing the hitherto unknown sulfur(II) fluoride, methanesulfenyl fluoride, CH3SF. Broadband UV-visible irradiation of methyl thiofluoroformate, FC(O)SCH3, isolated in a solid Ar matrix results, first, in photoisomerization of the syn into the anti form of the molecule, and, subsequently, in the elimination of CO with the concomitant formation of CH3SF. Continued irradiation brings about tautomerization of this product with the detachment and migration of a hydrogen from the methyl group to give the molecular complex H2C==S...HF. The changes have been monitored and the photoproducts detected and identified by the IR spectra of the matrices, and the conclusions confirmed: 1) with reference to the corresponding behavior of the perdeuterated molecule FC(O)SCD3; 2) by analogy with the properties of related molecules, for example, ClC(O)SCH3, CH3SCl, and H2C==S...HCl, and; 3) by comparison with the vibrational properties simulated for the different molecules by ab initio and density functional theory methods.
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Affiliation(s)
- Rosana M Romano
- CEQUINOR (UNLP-CONICET), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 47 esq. 115, (1900) La Plata, Argentina.
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Tobón YA, Romano RM, Védova COD, Downs AJ. Formation of New Halogenothiocarbonylsulfenyl Halides, XC(S)SY, through Photochemical Matrix Reactions Starting from CS2and a Dihalogen Molecule XY (XY = Cl2, Br2, or BrCl). Inorg Chem 2007; 46:4692-703. [PMID: 17411033 DOI: 10.1021/ic070119+] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Isolation of a dihalogen molecule XY (XY=Cl2, Br2, or BrCl) with CS2 in a solid Ar matrix at about 15 K leads, by broad-band UV-vis photolysis (200<or=lambda<or=800 nm), to a variety of products depending on the natures of X and Y. These products have been identified on the basis of the IR spectra of the matrices. In addition to the familiar species SCCl2, ClCS*, Cl*...SCS, CCl4, *CCl3, :CCl2, SCl2, SCBr2, CBr4, *CBr3, BrC(S)Cl, BrCCl3, and :CBrCl, the following new molecules have also been identified as products of the various photoreactions: syn-ClC(S)SCl, anti-ClC(S)SCl, syn-BrC(S)SBr, anti-BrC(S)SBr, syn-ClC(S)SBr, anti-ClC(S)SBr, syn-BrC(S)SCl, anti-BrC(S)SCl, ClC(S)S*, BrCS*, and Br*...SCS. The IR spectra of these hitherto unknown species have been interpreted with reference to the predictions of ab initio (HF and MP2) and density functional theory (DFT) calculations. The results are analyzed in relation to the reaction pathways accessed by matrix photolysis.
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Affiliation(s)
- Yeny A Tobón
- CEQUINOR (UNLP-CONICET) and Laboratorio de Servicios a la Industria y al Sistema Científico (UNLP-CIC-CONICET), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 47 esq. 115, (1900) La Plata, Argentina
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Romano RM, Picone AL, Downs AJ. Matrix-Isolated van der Waals Complexes Formed between CS2 and Dihalogen Molecules XY, Where XY = Cl2, Br2, BrCl, ICl, or IBr. J Phys Chem A 2006; 110:12129-35. [PMID: 17078607 DOI: 10.1021/jp064432t] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Weakly bound 1:1 complexes formed between CS2 and a dihalogen molecule XY = Cl2, Br2, BrCl, ICl, or IBr have each been trapped in an Ar matrix and hence investigated experimentally by their IR spectra as well as theoretically by MP2 and density functional calculations. A planar structure, with an intermolecular angle close to 90 degrees , is expected for such a S=C=S...XY molecular complex. Moreover, for each system involving a heteronuclear dihalogen, two possible complexes exist, viz., S=C=S...XY and S=C=S...YX. The calculated structures, vibrational properties, and binding energetics of the complexes are analyzed, and the NBO formalism is used to interpret their bonding properties. The IR spectra of the complexes thus simulated provided vital guidance for the interpretation of the matrix spectra. For example, complexation was predicted and observed (i) to induce red shifts of the principal absorptions associated with both the CS2 and XY components and (ii) to result, through the change in symmetry, in activation of some modes that are IR-silent for the free components.
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Affiliation(s)
- Rosana M Romano
- CEQUINOR (UNLP-CONICET), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 47 esq. 115, (1900) La Plata, Argentina.
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