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Keles H, Susanne F, Livingstone H, Hunter S, Wade C, Bourdon R, Rutter A. Development of a Robust and Reusable Microreactor Employing Laser Based Mid-IR Chemical Imaging for the Automated Quantification of Reaction Kinetics. Org Process Res Dev 2017. [DOI: 10.1021/acs.oprd.7b00245] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Hakan Keles
- Research
and Development, GlaxoSmithKline, Gunnels Wood Road, Stevenage SG1 2NY, U.K
| | - Flavien Susanne
- Product
and Process Engineering, GlaxoSmithKline, Gunnels Wood Road, Stevenage SG1 2NY, U.K
| | - Hamish Livingstone
- Technical
Development, Glaxo Wellcome Manufacturing Pte Ltd 1, Pioneer Sector
1, Singapore, 628413, Singapore
| | - Sarah Hunter
- Product
and Process Engineering, GlaxoSmithKline, Gunnels Wood Road, Stevenage SG1 2NY, U.K
| | - Charles Wade
- Global
API Chemistry, GlaxoSmithKline, Gunnels Wood Road, Stevenage SG1 2NY, U.K
| | - Rose Bourdon
- Research
and Development, GlaxoSmithKline, Gunnels Wood Road, Stevenage SG1 2NY, U.K
| | - Andrew Rutter
- Product
and Process Engineering, GlaxoSmithKline, Gunnels Wood Road, Stevenage SG1 2NY, U.K
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Tonannavar J, Prasannakumar S, Savanur J, Yenagi J. Vibration and DFT analysis of 2-methyl-3-nitrophenyl isocyanate and 4-methyl-2-nitrophenyl isocyanate. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 95:120-127. [PMID: 22617217 DOI: 10.1016/j.saa.2012.04.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2011] [Revised: 03/20/2012] [Accepted: 04/05/2012] [Indexed: 06/01/2023]
Abstract
Vibrational spectra of 2-methyl-3-nitrophenyl isocyanate and 4-methyl-2-nitrophenyl isocyanate, in the spectral region 4000-100 cm(-1), have been measured and assigned. Conformational and harmonic frequency analyses have been performed at B3LYP/6-311G(∗) level of calculations. The two stable conformers, cis and trans, have been computed for each of the molecules. It has been determined that the trans conformer has lower energy than the cis by 3.954 kJ/mol for 2-methyl-3-nitrophenyl isocyanate; whereas the cis conformer has lower energy than the trans by 10.230 kJ/mol for 4-methyl-2-nitrophenyl isocyanate. The vibration structure of 2-methyl-3-nitrophenyl isocyanate conforms to the combined behavior of its both conformers from which the deviation is shown by the structure of 4-methyl-2-nitrophenyl isocyanate which follows only the trans conformer. The occurrence of symmetric mode of the methyl group at higher frequency near 2944-20 cm(-1) is attributed to the phenyl ring strain caused by the substituents. As for the other stretching and bending modes, mutually exclusive pattern appears to work for the molecules: The nitro group's non-coplanarity with the phenyl ring is more evident in 4-methyl-2-nitrophenyl isocyanate where the asymmetric mode was assigned to the band at 1569cm(-1), whereas the symmetric mode at lower frequency 1339cm(-1). Occasional doublet appearance of the strong asymmetric absorption near 2282cm(-1) due to isocyanate moiety has been observed in the present study and is assumed to arise from the torsional vibration motion of the moiety rendered by the small energy gap between the conformers of 2-methyl-3-nitrophenyl isocyanate.
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Affiliation(s)
- J Tonannavar
- Department of Physics, Karnatak Univeristy, Dharwad 580 003, India.
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Yenagi J, Nandurkar AR, Tonannavar J. 2-Methoxyphenyl isocyanate and 2-Methoxyphenyl isothiocyanate: conformers, vibration structure and multiplet Fermi resonance. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 91:261-268. [PMID: 22381801 DOI: 10.1016/j.saa.2012.01.024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2011] [Revised: 01/04/2012] [Accepted: 01/16/2012] [Indexed: 05/31/2023]
Abstract
IR and Raman spectral measurements in the region 3500-400/50 cm(-1) have been made for the liquid samples of 2-Methoxyphenyl isocyanate and 2-Methoxyphenyl isothiocyanate. A complete assignment of the measured bands has been proposed as aided by conformational and vibration analyses at B3LYP/6-311++G** level of calculations. Three conformers for 2-Methoxyphenyl isocyanate and two for 2-Methoxyphenyl isothiocyanate have been determined. The tilt of the isocyanate (NCO) and isothiocyanate (NCS) moieties with respect to phenyl ring are in broad agreement with their parents. Stretching mode frequencies of methyl group (-OCH(3)) in 2-Methoxyphenyl isocyanate have been lowered in the 2900-2800 cm(-1); deformation asymmetric modes are IR strong and symmetric one Raman strong. In 2-Methoxyphenyl isothiocyanate, a similar pattern is true for stretching modes but deformation asymmetric modes are IR strong and symmetric mode has not been observed. Multiplet absorption band system near 2200 cm(-1) in 2-Methoxyphenyl isocyanate has been interpreted to be caused by Fermi resonance. A similar pattern in absorption near 2100 cm(-1) in 2-Methoxyphenyl isothiocyanate but more complex Raman band pattern has also been explained through Fermi resonance from heuristic stand-point. Many Raman modes in 1300-1100 cm(-1) are intensified apparently owing to isothiocyanate than isocyanate moiety. Phenyl ring breathing mode is shifted to 1040 cm(-1) as strong Raman; the symmetric stretching mode of O-CH(3) near 1023 cm(-1) as strong absorption.
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Affiliation(s)
- Jayashree Yenagi
- Department of Physics, Karnatak University, Dharwad 580 003, India.
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Majewska P, Rospenk M, Petrus R, Sobczyk L, Czarnik-Matusewicz B, Dąbrowski R. Study of packing of 4′-butyl-4-isothiocyanatotolane by X-ray diffraction and infrared spectra in polarized light. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2012.03.059] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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5
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Böhland H, Schneider FM. Isomere Niob(V)-chlorid- und Tantal(V)-chlorid-Methylthiocyanat-Verbindungen. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19720120208] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Majewska P, Rospenk M, Czarnik-Matusewicz B, Kochel A, Sobczyk L, Dąbrowski R. X-ray diffraction, DFT theoretical, and IR polarized spectroscopic studies of the crystal-like E-mesophase of 4′-hexyloxy-isothiocyanatotolane (6OTOLT). Chem Phys 2007. [DOI: 10.1016/j.chemphys.2007.09.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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8
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Doddamani SB, Ramoji A, Yenagi J, Tonannavar J. The vibrational spectra, assignments and ab initio/DFT analysis for 3-chloro, 4-chloro and 5-chloro-2-methylphenyl isocyanates. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2007; 67:150-9. [PMID: 16942913 DOI: 10.1016/j.saa.2006.06.038] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2006] [Revised: 06/26/2006] [Accepted: 06/28/2006] [Indexed: 05/11/2023]
Abstract
The Raman (3500-50 cm(-1)) and infrared (4000-200 cm(-1)) spectra of 3-chloro, 4-chloro and 5-chloro-2-methylphenyl isocyanates have been measured. Ab initio and density functional theory calculations, at the levels of RHF/6-311G* and B3LYP/6-311G*, have been performed: energies, optimized geometrical parameters, vibrational frequencies, infrared intensities, Raman activities, depolarization ratios and nuclear displacements are obtained. Potential energy distributions (PEDs) and normal modes, for the spectral data computed at B3LYP/6-311G*, have also been obtained from a force-field calculations. A complete vibrational assignments of the observed spectra have been proposed. The force-field calculations have shown that, several of the normal modes are coupled, as is the case with large molecular systems possessing very low or no symmetry, such as investigated in the present study. Further, the investigation of the internal rotation of the isocyanate, NCO, by B3LYP/6-31G* level of theory has shown that the moiety maintains nearly the same orientation in all the three compounds (approximately 140-145 degrees tilt to the para-position) as in phenyl isocyanate. Two conformers, cis and trans forms, with respect to the substituents, NCO and CH(3), have been determined: the cis form lies above trans form by less than a kilocalorie per mole for each compound.
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Affiliation(s)
- S B Doddamani
- Department of Physics, Karnataka University, Dharwad 580 003, India
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9
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Vibrational, conformational and theoretical studies of dichlorofluoromethyl thiocyanate, CCl2FSCN. J Mol Struct 1995. [DOI: 10.1016/0022-2860(94)08424-g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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10
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Pasinszki T, Veszprémi T, Fehér M. The equilibrium structure of methyl pseudohalides: an ab initio study. Chem Phys Lett 1992. [DOI: 10.1016/0009-2614(92)85133-u] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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11
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Midtgaard T, Gundersen G, Nielsen C. Vibrational spectra, molecular structure and conformation of gaseous 3-thiocyanatopropyne (propargylthiocyanate). J Mol Struct 1988. [DOI: 10.1016/0022-2860(88)80239-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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12
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Sullivan J, Heusel H, Durig J. Infrared and raman spectra of methyl thiocyanate and conformations of some alkyl thiocyanates and isothiocyanates. J Mol Struct 1984. [DOI: 10.1016/0022-2860(84)80096-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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13
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Durig J, Sullivan J, Heusel H, Cradock S. Infrared and Raman spectra and normal coordinate calculations for methylisothiocyanate. J Mol Struct 1983. [DOI: 10.1016/0022-2860(83)90095-9] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Owens C, Woods JM, Filo AK, Pytlewski LL, Chasan DE, Karayannis NM. Phenyl isocyanate interactions with tin(IV) halides. Inorganica Chim Acta 1979. [DOI: 10.1016/s0020-1693(00)95523-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Villa J, Powell H. Preparation, characterization and lewis basicity of some copper(II) and nickel(II) adducts with organic isocyanates and isothiocyanates. Inorganica Chim Acta 1979. [DOI: 10.1016/s0020-1693(00)91661-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Higgins R, Combs LL, Malloy TB, Cook RL. Low resolution microwave spectra and indo calculations of phenylisothiocyanate and phenylisocyanate. J Mol Struct 1975. [DOI: 10.1016/0022-2860(75)80048-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Chantry G, Nicol EA, Harrison D, Bouchy A, Roussy G. Vibrational spectrum, assignment and molecular symmetry of phenyl isocyanate in the liquid phase. ACTA ACUST UNITED AC 1974. [DOI: 10.1016/0584-8539(74)80122-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Torgrimsen T, Klaboe P, Nicolaisen F. Conformations and vibrational spectra of allyl isocyanate and allyl isothiocyanate. J Mol Struct 1974. [DOI: 10.1016/0022-2860(74)85090-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Some considerations about the substituent effect on the infrared absorption intensities of symmetric stretching and bending vibrations of methyl group. ACTA ACUST UNITED AC 1972. [DOI: 10.1016/0584-8539(72)80103-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Bailey R, Kozak S, Michelsen T, Mills W. Infrared spectra of complexes of the thiocyanate and related ions. Coord Chem Rev 1971. [DOI: 10.1016/s0010-8545(00)80015-6] [Citation(s) in RCA: 495] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Selchau M, Pohloudek-Fabini R. [Synthesis and infrared spectroscopic behavior of ortho-rhidanated phenylisothiocyanates. 36. Organic rhodan-compounds]. ARCHIV DER PHARMAZIE UND BERICHTE DER DEUTSCHEN PHARMAZEUTISCHEN GESELLSCHAFT 1969; 302:504-10. [PMID: 5267015 DOI: 10.1002/ardp.19693020705] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Eiden F, Gauglitz G. Über Thiocyansäure-Derivate aktivierter Methylenverbindungen. 14. Mitt. über Untersuchungen an Acyl-enaminen. Arch Pharm (Weinheim) 1969. [DOI: 10.1002/ardp.19693020409] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Millefiori S, Foffani A. Dipole moments and rotational isomerism for organic thio- and selenocyanates. Tetrahedron 1966. [DOI: 10.1016/0040-4020(66)80051-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Stephenson C, Coburn W, Wilcox W. The vibrational spectra and assignments of nitrobenzene, phenyl isocyanate, phenyl isothiocyanate, thionylaniline and anisole. ACTA ACUST UNITED AC 1961. [DOI: 10.1016/0371-1951(61)80029-5] [Citation(s) in RCA: 105] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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