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Wang T, Ke X, Li J, Wang Y, Guan W, Sha X, Yang C, Zhang TC. Synergistic preparation and application in PCU of α-calcium sulfate hemihydrate whiskers from phosphogypsum and electrolytic manganese residue. Sci Rep 2024; 14:6260. [PMID: 38491074 PMCID: PMC10943202 DOI: 10.1038/s41598-024-56817-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Accepted: 03/11/2024] [Indexed: 03/18/2024] Open
Abstract
The α-calcium sulfate hemihydrate whiskers (α-CSHWs) were first prepared using phosphogypsum (PG) and electrolytic manganese residue (EMR) as raw materials for coating urea, demonstrating excellent controlled-release properties. The effects of different reaction conditions on α-CSHWs, achieved by optimizing the reaction time, the concentrations of NH4+, Mn2+, and other factors, were discussed. Results showed that when the EMR content was 25 wt%, the reaction temperature was 100 °C, and the reaction time was 3 h, α-CSHWs with a length-to-diameter ratio of 39 were obtained. Through experiments and density functional theory (DFT), the mechanism of α-CSHWs preparation was elucidated. The results show that the addition of EMR reduces the content of impurity ions PO43- and F- in PG while introducing NH4+ and Mn2+. Interestingly, both NH4+ and Mn2+ can reduce the nucleation time of α-CSHWs, while PO43-, Mn2+, and F- are more likely to adsorb on the (0 0 6) crystal plane of α-CSHWs, NH4+ readily adsorbs on the (4 0 0) crystal plane. The controlled-release performance of modified α-CSHWs incorporated into polyurethane-coated urea (PCU) was investigated, and it was found that the addition of Mα significantly prolonged the nutrient release period, with the period extending up to 116 days for coatings of 5wt% and above. This work not only enhances the efficiency of PG and EMR utilization but also serves as a reference for the straightforward synthesis and application of α-CSHWs.
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Affiliation(s)
- Ting Wang
- Key Laboratory of Catalysis Conversion and Energy Materials Chemistry of Education, Engineering Research Center for Heavy Metal Pollution Control of Hubei Province, College of Resources and Environmental Science, South-Central Minzu University, Wuhan, 430074, China
| | - Xuan Ke
- Key Laboratory of Catalysis Conversion and Energy Materials Chemistry of Education, Engineering Research Center for Heavy Metal Pollution Control of Hubei Province, College of Resources and Environmental Science, South-Central Minzu University, Wuhan, 430074, China
| | - Jia Li
- Key Laboratory of Catalysis Conversion and Energy Materials Chemistry of Education, Engineering Research Center for Heavy Metal Pollution Control of Hubei Province, College of Resources and Environmental Science, South-Central Minzu University, Wuhan, 430074, China.
| | - Ying Wang
- Key Laboratory of Catalysis Conversion and Energy Materials Chemistry of Education, Engineering Research Center for Heavy Metal Pollution Control of Hubei Province, College of Resources and Environmental Science, South-Central Minzu University, Wuhan, 430074, China
| | - Weiwei Guan
- Key Laboratory of Catalysis Conversion and Energy Materials Chemistry of Education, Engineering Research Center for Heavy Metal Pollution Control of Hubei Province, College of Resources and Environmental Science, South-Central Minzu University, Wuhan, 430074, China
| | - Xia Sha
- Key Laboratory of Catalysis Conversion and Energy Materials Chemistry of Education, Engineering Research Center for Heavy Metal Pollution Control of Hubei Province, College of Resources and Environmental Science, South-Central Minzu University, Wuhan, 430074, China
| | - Chenjing Yang
- Key Laboratory of Catalysis Conversion and Energy Materials Chemistry of Education, Engineering Research Center for Heavy Metal Pollution Control of Hubei Province, College of Resources and Environmental Science, South-Central Minzu University, Wuhan, 430074, China
| | - Tian C Zhang
- Civil & Environmental Engineering Department, College of Engineering, University of Nebraska-Lincoln, Omaha, NE, 68182, USA
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Zhao X, Lin Y, Huang L, Chen L. Theoretical study on formation mechanism of acetic acid associating configurations and their distributions under saturated conditions. J Mol Model 2024; 30:49. [PMID: 38267712 DOI: 10.1007/s00894-024-05850-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2023] [Accepted: 01/17/2024] [Indexed: 01/26/2024]
Abstract
CONTEXT The vapor-liquid equilibrium (VLE) properties of acetic acid systems generally behave strong non-ideality due to the associating interaction among acetic acid molecules. Theoretical study of the associating mechanism will provide guidance for the VLE property prediction, which is crucial for the designing on the separation process of the acetic acid systems. In this work, the association conformers and their distribution on acetic acid molecules in saturated gas and liquid phase were firstly studied. The proportions of the acetic acid monomer and multimers were obtained, which will contribute to the foundation for the vapor-liquid equilibrium simulations. The association mechanism on acetic acid molecules was then investigated by comparing among the structures and non-bonded interaction energies of different dimers. The structure of the cyclic dimer containing two OC-HO hydrogen bonds, may be found probably when acetic acid molecules approached. Electronic properties of different acetic acid dimers showed that the electrons around carbonyl oxygen atoms were deflected by the attraction of hydrogen atoms in the other molecule, which polarized the acetic acid molecules when the hydrogen bonds between acetic acid molecules were formed, providing theoretical basis for the polarized acetic acid molecular model. METHODS In this work, the molecular dynamics (MD) simulations and DFT calculations were conducted through the software GROMACS and Gaussian 09, respectively. For the MD simulations, the OPLS-AA force field was used as the atomic force field, with the cubic simulation cells constructed by Packmol program. For the DFT calculations, the M06-2X functional was employed for the optimization of the associating structures with the 6-311G** basis sets. Hydrogen bonding energies of dimers were corrected for the basis set superposition error (BSSE) and the deformation energies of monomers. Furthermore, the energy decomposition analysis was conducted at DFT/M06-2X/def-tzp level by the ADF software, and the wave function analysis was conducted by the Multiwfn software including the atom in molecule (AIM) topology analysis, the electronic potential analysis, and the electron density difference analysis.
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Affiliation(s)
- Xueshuang Zhao
- Zhejiang Titan Design & Engineering Co., Ltd., Hangzhou, 310038, Zhejiang, China
| | - Yunzhou Lin
- Zhejiang Transfar Functional New Materials Co., Ltd, No. 1818, New Century Avenue, Qiantang New District, Hangzhou, 311215, China
| | - Linbing Huang
- Zhejiang Titan Design & Engineering Co., Ltd., Hangzhou, 310038, Zhejiang, China.
| | - Lihang Chen
- Institute of Zhejiang University-Quzhou, 99 Zheda Road, Quzhou, 324000, China.
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Zhang M, Chen L, Yang H, Ma J. Theoretical Study of Acetic Acid Association Based on Hydrogen Bonding Mechanism. J Phys Chem A 2017; 121:4560-4568. [DOI: 10.1021/acs.jpca.7b03324] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Minhua Zhang
- Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology and ‡Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Lihang Chen
- Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology and ‡Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Huaming Yang
- Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology and ‡Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Jing Ma
- Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology and ‡Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, China
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Flakus HT, Hachuła B, Hołaj-Krzak JT, Al-Agel FA, Rekik N. "Long-distance" H/D isotopic self-organization phenomena in scope of the infrared spectra of hydrogen-bonded terephthalic and phthalic acid crystals. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 173:65-74. [PMID: 27599190 DOI: 10.1016/j.saa.2016.08.051] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Revised: 08/23/2016] [Accepted: 08/25/2016] [Indexed: 06/06/2023]
Abstract
This paper deals with the experimental and theoretical studies of abnormal properties of terephthalic acid (TAC) and phthalic acid (PAC) crystals manifested in the H/D isotopic exchange. The widely utilized deuteration routine appeared to be insufficiently effective in the case of the h6-TAC isotopomer. In the case of the d4-TAC derivative the isotopic exchange process occurred noticeably more effectively. In contrast, both isotopomers of PAC, h6 and d4, appeared much more susceptible for deuteration. A theoretical model was elaborated describing "long-distance" dynamical co-operative interactions involving hydrogen bonds in TAC and PAC crystals. The model assumes extremely strong dynamical co-operative interactions of hydrogen bonds from the adjacent (COOH)2 cycles. This leads to an additional stabilization of h6-TAC molecular chains. The interaction energies affect the chemical equilibrium of the H/D isotopic exchange. The model predicts a differentiated influence of the H and D atoms linked to the aromatic rings on to the process. In this approach the totally-symmetric CH bond stretching vibrations and the proton stretching totally symmetric vibrations couple with the π-electronic motions. It was also shown that identical hydrogen isotope atoms, H or D, in whole TAC molecules, noticeably enlarge the energy of the dynamical co-operative interactions in the crystals, in contrast to the case of different hydrogen isotopes present in the carboxyl groups and linked to the aromatic rings. The "long-distance" dynamical co-operative interactions in PAC crystals were found of a minor importance due to the electronic properties of PAC molecules.
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Affiliation(s)
- Henryk T Flakus
- Institute of Chemistry, University of Silesia, Katowice 40-006, Poland.
| | - Barbara Hachuła
- Institute of Chemistry, University of Silesia, Katowice 40-006, Poland.
| | | | - Faisal A Al-Agel
- Physics Department, College of Science, Aljouf University, P. O. Box 2014, Sakaka, Saudi Arabia
| | - Najeh Rekik
- Physics Department, Faculty of Science, Ha'il University, P. O. Box 2440, 81451 Ha'il, Saudi Arabia; Laboratoire de Physique Quantique, Faculté des Sciences de Monastir, 5019 Monastir, Tunisia.
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Fathi S, Gonzalez MA, Bahri M, Nasr S. Structural investigations of liquid formamide by x-ray scattering, ab-initio calculations and molecular dynamics simulations. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.01.098] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Fathi S, Gonzalez MA, Bahri M, Nasr S, Bellissent-Funel MC. Structural investigation of liquid formic acid by X-ray and neutron scattering, ab initio calculations and molecular dynamics simulations. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.03.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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7
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Local order in fully deuterated liquid acetic acid as studied by neutron scattering. Complementarity to X-ray results. J Mol Liq 2014. [DOI: 10.1016/j.molliq.2014.06.029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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8
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Extremely strong temperature-dependent Davydow-splitting effects in the polarized IR spectra of the hydrogen bond: Pyrazole and quinolin-2(1H)-one crystals. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2014.03.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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9
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Hachuła B, Flakus HT, Polasz A. Temperature, H/D isotopic and Davydov-splitting effects in the polarized IR spectra of hydrogen bond chain systems: 1,2,4-Triazole and 3-methyl-2-oxindole crystals. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 120:287-296. [PMID: 24184631 DOI: 10.1016/j.saa.2013.09.040] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Revised: 08/28/2013] [Accepted: 09/07/2013] [Indexed: 06/02/2023]
Abstract
The spectral properties of two different hydrogen-bonded crystalline systems, 1,2,4-triazole and 3-methyl-2-oxindole, containing molecular chains in their lattices, were examined by polarized IR spectroscopy, aided by the calculations utilizing the "strong-coupling" model. The experimental and theoretical approaches have shown that the individual crystal spectral properties in IR remain in a close relation with the electronic structure of the individual molecular systems. A vibronic coupling mechanism involving the hydrogen bond protons and the electrons occupying the π-electronic orbitals in the molecules determines the way in which the vibrational exciton coupling between the hydrogen bonds in the crystals occurs. For the associating systems, which molecules contain large delocalized π-electronic systems coupled directly with H-bonds, strong exciton interactions involving the vibrationally excited hydrogen bonds in the chains prefer a "tail-to-head"-type Davydov-coupling widespread via the π-electrons. A weak through-space exciton coupling involves two closely-spaced hydrogen bonds belonging to two different adjacent chains in the case, when large π-electronic systems in the molecules are absent. The relative contribution of each exciton coupling mechanism in the chain system spectra generation is temperature-dependent. The two competing individual Davydov-coupling mechanism are responsible for the appearance in the polarized spectra of temperature-dependent Davydov-splitting effects differentiating the spectral properties of the two crystalline systems. The H/D isotopic ''self-organization'' phenomenon, depending on a non-random distribution of protons and deuterons in the crystal hydrogen bridges was also analyzed.
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Affiliation(s)
- Barbara Hachuła
- Institute of Chemistry, University of Silesia, 9 Szkolna Street, Pl-40-006 Katowice, Poland.
| | - Henryk T Flakus
- Institute of Chemistry, University of Silesia, 9 Szkolna Street, Pl-40-006 Katowice, Poland.
| | - Anna Polasz
- Institute of Chemistry, University of Silesia, 9 Szkolna Street, Pl-40-006 Katowice, Poland
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Flakus HT, Hachuła B, Garbacz A. H/D Isotopic and Temperature Effects in the Polarized IR Spectra of Hydrogen-Bond Cyclic Trimers in the Crystal Lattices of Acetone Oxime and 3,5-Dimethylpyrazole. J Phys Chem A 2012; 116:11553-67. [DOI: 10.1021/jp308375z] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Henryk T. Flakus
- Institute of Chemistry, University of Silesia, 9 Szkolna Street, Pl-40-006 Katowice, Poland
| | - Barbara Hachuła
- Institute of Chemistry, University of Silesia, 9 Szkolna Street, Pl-40-006 Katowice, Poland
| | - Aleksandra Garbacz
- Institute of Chemistry, University of Silesia, 9 Szkolna Street, Pl-40-006 Katowice, Poland
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Flakus HT, Smiszek-Lindert W, Hachuła B, Michta A. H/D isotopic recognition mechanism in hydrogen-bonded crystals of 3-methylacetanilide and 4-methylacetanilide. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 97:263-273. [PMID: 22765945 DOI: 10.1016/j.saa.2012.06.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2012] [Revised: 06/05/2012] [Accepted: 06/06/2012] [Indexed: 06/01/2023]
Abstract
Polarized IR spectra of 3- and 4-methylacetanilide as well as their deuterium derivative crystals were measured at 293K and at 77K by a transmission method. The obtained results were interpreted within the limits of the "strong-coupling" theory. This approach facilitated the understanding of the H/D isotopic, temperature and dichroic effects observed in the hydrogen bond IR spectra. The existence of H/D isotopic "self-organization" phenomenon, depending on the non-random distribution of protons and deuterons in the crystal lattices of isotopically diluted samples of a compound was ascertained. This effect resulted from the dynamical co-operative interactions involving the closely spaced hydrogen bonds, each belonging to a different chain of associated 3- and 4-methylacetanilide molecules. In the case of 4-methylacetanilide crystals weaker but non-negligible exciton coupling also involved adjacent hydrogen bonds in each molecular chain and the H/D isotopic "self-organization" mechanism concerned at least four hydrogen bonds from each unit cell. The source of these phenomena was ascribed to the molecular electronic properties determined by aromatic rings linked to nitrogen atoms of the amide fragments.
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Affiliation(s)
- Henryk T Flakus
- Institute of Chemistry, University of Silesia, 9 Szkolna Street, Pl-40-006 Katowice, Poland.
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Temperature and H/D Isotopic Effects in the IR Spectra of the Hydrogen Bond in Solid-State 2-Furanacetic Acid and 2-Furanacrylic Acid. ACTA ACUST UNITED AC 2012. [DOI: 10.1155/2012/125471] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Polarized IR spectra of 2-furanacetic acid and of 2-furanacrylic acid crystals were measured at 293 K and 77 K in the vO−H and vO−H band frequency ranges. The corresponding spectra of the two individual systems strongly differ, one from the other, by the corresponding band shapes as well as by the temperature effect characterizing the bands. The crystal spectral properties remain in a close relation with the electronic structure of the two different molecular systems. We show that a vibronic coupling mechanism involving the hydrogen bond protons and the electrons on the π-electronic systems in the molecules determines the way in which the vibrational exciton coupling between the hydrogen bonds in the carboxylic acid dimers occurs. A strong coupling in 2-furanacrylic acid dimers prefers a “tail-to-head-” type Davydov coupling widespread by the π-electrons. A weak through-space coupling in 2-furanacetic acid dimers is responsible for a “side-to-side-” type coupling. The relative contribution of each exciton coupling mechanism in the dimer spectra generation is temperature and the molecular electronic structure dependent. This explains the observed difference in the temperature-induced evolution of the compared spectra.
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Flakus HT, Hachuła B, Majchrowska A. Temperature and H/D Isotopic “Self-Organization” Effects in the IR Spectra of the Hydrogen Bond Tetramer Systems in 3,5-Diphenylpyrazole and 4-Methyl-1,2,4-triazolethione Crystals. J Phys Chem A 2012; 116:7848-61. [DOI: 10.1021/jp303541m] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Henryk T. Flakus
- Institute of Chemistry, University of Silesia, 9 Szkolna Street, Pl-40-006 Katowice, Poland
| | - Barbara Hachuła
- Institute of Chemistry, University of Silesia, 9 Szkolna Street, Pl-40-006 Katowice, Poland
| | - Aleksandra Majchrowska
- Institute of Chemistry, University of Silesia, 9 Szkolna Street, Pl-40-006 Katowice, Poland
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15
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Flakus HT, Rekik N, Jarczyk A. Polarized IR spectra of the hydrogen bond in 2-thiopheneacetic acid and 2-thiopheneacrylic acid crystals: H/D isotopic and temperature effects. J Phys Chem A 2012; 116:2117-30. [PMID: 22272930 DOI: 10.1021/jp210950n] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Polarized IR spectra of 2-thiopheneacetic acid and of 2-thiopheneacrylic acid crystals were measured at 293 and 77 K in the υ(O-H) and υ(O-D) band frequency ranges. The corresponding spectra of the two individual systems strongly differ, one from the other, by the corresponding band shapes as well as by the temperature effect characterizing the bands. The crystal spectral properties remain in close relation with the electronic structure of the two different molecular systems. We show that a vibronic coupling mechanism involving the hydrogen bond protons and the electrons on the π- electronic systems in the molecules determines the way in which the vibrational exciton coupling between the hydrogen bonds in the carboxylic acid dimers occurs. Strong coupling in 2-thiopheneacrylic acid dimers prefers a "tail-to-head"-type Davydov coupling widespread by the π- electrons. A weak through-space coupling in 2-thiopheneacetic acid dimers, of a van der Waals type, is responsible for a "side-to-side"-type coupling. The relative contribution of each exciton coupling mechanism in the dimer spectra generation is temperature and the molecular electronic structure dependent. This explains the observed difference in the temperature- induced evolution of the compared spectra.
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Affiliation(s)
- Henryk T Flakus
- Institute of Chemistry, University of Silesia, Katowice, Poland.
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Flakus HT, Hachuła B, Stolarczyk A. H/D isotopic recognition in hydrogen bonded systems: H/D isotopic self-organization effects in the IR spectra of the hydrogen bond in 2-methylimidazole crystals. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 85:7-16. [PMID: 22019215 DOI: 10.1016/j.saa.2011.08.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2011] [Revised: 07/04/2011] [Accepted: 08/14/2011] [Indexed: 05/31/2023]
Abstract
Polarized IR spectra of H12(3)45 2-methylimidazole and of its H1D2(3)45, D1H2(3)45 and D12(3)45 deuterium derivative crystals are reported and interpreted within the limits of the "strong-coupling" theory. The spectra interpretation facilitated the recognition of the H/D isotopic "self-organization" phenomenon, which depends on a non-random distribution of protons and deuterons in the lattices of isotopically diluted crystal samples. The H/D isotopic "self-organization" mechanism engaged all four hydrogen bonds from each unit cell. These effects basically resulted from the dynamical co-operative interactions involving adjacent hydrogen bonds in each hydrogen bond chain. A weaker exciton coupling involved the closely spaced hydrogen bonds; each belonging to a different chain of associated 2-methylimidazole molecules. The high intensity of the narrow band at ca. 1880cm(-1) was interpreted as the result of coupling between the γ(N-H⋯N) proton bending "out of plane" vibration overtone and the ν(N-H) proton stretching vibration.
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Affiliation(s)
- Henryk T Flakus
- Institute of Chemistry, University of Silesia, 9 Szkolna Street, Pl-40-006 Katowice, Poland.
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Flakus HT, Hachuła B. Effect of the resonance of the C-H and O-H bond stretching vibrations on the IR spectra of the hydrogen bond in formic and acetic acid. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 79:1276-1284. [PMID: 21620759 DOI: 10.1016/j.saa.2011.04.054] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2011] [Revised: 04/19/2011] [Accepted: 04/26/2011] [Indexed: 05/30/2023]
Abstract
It is shown that the resonance of the O-H and C-H bond stretching vibrations is responsible for a noticeable intensity redistribution effect in the IR spectra of associated formic acid molecules in the gaseous phase. This effect is manifested by a considerably high growth in intensity of the νC-H band, which overlaps the νO-H band contour in the spectra. A vibronic coupling of the Herzberg-Teller-type expressed by the second order term in the perturbation theory is the most probable source of these spectral effects. The presented mechanism explains the variation of the effect magnitude accompanying the phase transitions. The proposed model also facilitates the understanding of the H/D isotopic effects in the spectra as well as the essential difference in the corresponding spectral properties between the formic and the acetic acid.
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Affiliation(s)
- Henryk T Flakus
- Institute of Chemistry, University of Silesia, 9 Szkolna Street, 40-006 Katowice, Poland.
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Flakus HT, Śmiszek-Lindert W, Hachuła B. H/D isotopic recognition in hydrogen-bonded systems: strong dynamical coupling effects in the polarized IR spectra of 3-methylthioacetanilide and 4-methylthioacetanilide crystals. J Phys Chem A 2011; 115:7511-20. [PMID: 21612296 DOI: 10.1021/jp2016903] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This paper presents the investigation results of the polarized IR spectra of the hydrogen bond in crystals of 3- and 4-methylthioacetanilide. The spectra were measured at 293 and 77 K by a transmission method, with the use of polarized light. The main spectral properties of the crystals can be interpreted satisfactorily in terms of the "strong-coupling" theory, on the basis of the hydrogen bond centrosymmetric dimer model. The spectra revealed that the strongest vibrational exciton coupling involved the closely spaced hydrogen bonds, each belonging to a different chain of associated 3- and 4-methylthioacetanilide molecules. A weaker exciton coupling involved the adjacent hydrogen bonds in each individual chain. It was proven that a nonrandom distribution of the protons and deuterons took place in the lattices of isotopically diluted crystalline samples of 3- and 4-methylthioacetanilide. In each case, the H/D isotopic "self-organization" mechanism involved all four hydrogen bonds from each unit cell.
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Affiliation(s)
- Henryk T Flakus
- Institute of Chemistry, University of Silesia, 9 Szkolna Street, Pl-40 006 Katowice, Poland.
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The hydrogen bond IR spectra of indole-3-carboxaldehyde and 3-acetylindole crystals – The reason behind their similarity. Chem Phys 2011. [DOI: 10.1016/j.chemphys.2010.11.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Zineb NB, Hammami F, Nasr S. X-ray scattering study of liquid acetic acid: Is the short crystal structure reproduced in the liquid? J Mol Struct 2010. [DOI: 10.1016/j.molstruc.2010.09.023] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Effects of dynamical couplings in hydrogen bond systems in the polarized IR spectra of 3-hydroxybenzaldehyde and 4-hydroxybenzaldehyde crystals. Chem Phys 2010. [DOI: 10.1016/j.chemphys.2010.01.024] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Hydration mechanism on a poly(methacrylic acid) film studied by in situ attenuated total reflection infrared spectroscopy. POLYMER 2009. [DOI: 10.1016/j.polymer.2009.09.060] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Effects of strong inter-hydrogen bond dynamical couplings in the polarized IR spectra of adipic acid crystals. Chem Phys 2009. [DOI: 10.1016/j.chemphys.2009.09.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Johnson M, Trommsdorff H. Vibrational spectra of crystalline formic and acetic acid isotopologues by inelastic neutron scattering and numerical simulations. Chem Phys 2009. [DOI: 10.1016/j.chemphys.2008.11.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Rekik N, Oujia B, Wójcik MJ. Theoretical infrared spectral density of H-bonds in liquid and gas phases: Anharmonicities and dampings effects. Chem Phys 2008. [DOI: 10.1016/j.chemphys.2008.05.009] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Flakus HT, Hachuła B. Effects of “excessive” exciton interactions in polarized IR spectra of the hydrogen bond in 2-butynoic acid crystals: Proton transfer induced by dynamical co-operative interactions involving hydrogen bonds. Chem Phys 2008. [DOI: 10.1016/j.chemphys.2008.01.035] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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