1
|
Klimavicius V, Maršalka A, Kizalaite A, Zarkov A, Kareiva A, Aidas K, Hirschinger J, Balevicius V. Step-by-step from amorphous phosphate to nano-structured calcium hydroxyapatite: monitoring by solid-state 1H and 31P NMR and spin dynamics. Phys Chem Chem Phys 2022; 24:18952-18965. [PMID: 35916288 DOI: 10.1039/d2cp02108k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The solid-state 1H, 31P NMR spectra and cross-polarization (CP MAS) kinetics in the series of samples containing amorphous phosphate phase (AMP), composite of AMP + nano-structured calcium hydroxyapatite (nano-CaHA) and high-crystalline nano-CaHA were studied under moderate spinning rates (5-30 kHz). The combined analysis of the solid-state 1H and 31P NMR spectra provides the possibility to determine the hydration numbers of the components and the phase composition index. A broad set of spin dynamics models (isotropic/anisotropic, relaxing/non-relaxing, secular/semi-non-secular) was applied and fitted to the experimental CP MAS data. The anisotropic model with the angular averaging of dipolar coupling was applied for AMP and nano-CaHA for the first time. It was deduced that the spin diffusion in AMP is close to isotropic, whereas it is highly anisotropic in nano-CaHA being close to the Ising-type. This can be caused by the different number of internuclear interactions that must be explicitly considered in the spin system for AMP (I-S spin pair) and nano-CaHA (IN-S spin system with N ≥ 2). The P-H distance in nano-CaHA was found to be significantly shorter than its crystallographic value. An underestimation can be caused by several factors, among those - proton conductivity via a large-amplitude motion of protons (O-H tumbling and the short-range diffusion) that occurs along OH- chains. The P-H distance deduced for AMP, i.e. the compound with HPO42- as the dominant structure, is fairly well matched to the crystallographic data. This means that the CP MAS kinetics is a capable technique to obtain complementary information on the proton localization in H-bonds and the proton transfer in the cases where traditional structure determination methods fail.
Collapse
Affiliation(s)
| | - Arūnas Maršalka
- Institute of Chemical Physics, Vilnius University, LT-10257 Vilnius, Lithuania.
| | - Agne Kizalaite
- Institute of Chemistry, Vilnius University, LT-03225, Vilnius, Lithuania
| | - Aleksej Zarkov
- Institute of Chemistry, Vilnius University, LT-03225, Vilnius, Lithuania
| | - Aivaras Kareiva
- Institute of Chemistry, Vilnius University, LT-03225, Vilnius, Lithuania
| | - Kęstutis Aidas
- Institute of Chemical Physics, Vilnius University, LT-10257 Vilnius, Lithuania.
| | - Jérôme Hirschinger
- Institut de Chimie, Université de Strasbourg, UMR 7177 CNRS, Strasbourg, France
| | - Vytautas Balevicius
- Institute of Chemical Physics, Vilnius University, LT-10257 Vilnius, Lithuania.
| |
Collapse
|
2
|
Wang F, Tao P. Exploring free energy profile of petroleum thermal cracking mechanisms. J Mol Model 2019; 26:15. [PMID: 31858253 DOI: 10.1007/s00894-019-4273-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Accepted: 12/09/2019] [Indexed: 11/25/2022]
Abstract
Understanding the mechanisms of petroleum thermal cracking is critical to develop more efficient and eco-friendly petroleum cracking processes. Asphaltenes are the main component of petroleum subjected to cracking processes. Thermal cracking mechanisms of petroleum were explored by computational methods using 1,2-diphenylethane (DPE) as a model molecule in this study. The overall mechanisms were divided into four steps including initiation, H-transfer reaction, H-ipso reaction, and termination represented by seven reactions. We carried out extensive quantum chemistry calculations at high levels of theory to accurately explore the minimum energy pathways as the mechanisms of the proposed reactions. The reaction energy and barriers in terms of enthalpy and free energy and their temperature dependence were calculated in the vacuum and in both polar and nonpolar solvents using the polarizable continuum model (PCM) method. The temperature dependence of the target reaction barriers are characterized in different environments and provides computational guidance for future development for petroleum thermal cracking. As the first reported systematic investigation of petroleum cracking mechanisms, this study provided a comprehensive theoretical description of petroleum cracking processes with valuable information about temperature and solvent dependence. Graphical abstract.
Collapse
Affiliation(s)
- Feng Wang
- Department of Chemistry, Center for Scientific Computation, Center for Drug Discovery, Design, and Delivery (CD4), Southern Methodist University, Dallas, TX, 75275, USA
| | - Peng Tao
- Department of Chemistry, Center for Scientific Computation, Center for Drug Discovery, Design, and Delivery (CD4), Southern Methodist University, Dallas, TX, 75275, USA.
| |
Collapse
|
3
|
Klimavicius V, Gdaniec Z, Kausteklis J, Aleksa V, Aidas K, Balevicius V. NMR and Raman Spectroscopy Monitoring of Proton/Deuteron Exchange in Aqueous Solutions of Ionic Liquids Forming Hydrogen Bond: A Role of Anions, Self-Aggregation, and Mesophase Formation. J Phys Chem B 2013; 117:10211-20. [DOI: 10.1021/jp4021245] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Vytautas Klimavicius
- Department
of General Physics and Spectroscopy, Vilnius University, Sauletekio
9-3, LT-10222 Vilnius, Lithuania
| | - Zofia Gdaniec
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, Z. Noskowskiego 12/14, PL-61704 Poznan, Poland
| | - Jonas Kausteklis
- Department
of General Physics and Spectroscopy, Vilnius University, Sauletekio
9-3, LT-10222 Vilnius, Lithuania
| | - Valdemaras Aleksa
- Department
of General Physics and Spectroscopy, Vilnius University, Sauletekio
9-3, LT-10222 Vilnius, Lithuania
| | - Kestutis Aidas
- Department
of General Physics and Spectroscopy, Vilnius University, Sauletekio
9-3, LT-10222 Vilnius, Lithuania
| | - Vytautas Balevicius
- Department
of General Physics and Spectroscopy, Vilnius University, Sauletekio
9-3, LT-10222 Vilnius, Lithuania
| |
Collapse
|
5
|
Balevicius V, Gdaniec Z, Aidas K, Tamuliene J. NMR and Quantum Chemistry Study of Mesoscopic Effects in Ionic Liquids. J Phys Chem A 2010; 114:5365-71. [DOI: 10.1021/jp909293b] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Vytautas Balevicius
- Faculty of Physics, Vilnius University, Sauletekio 9-3, LT-10222 Vilnius, Lithuania, Institute of Bioorganic Chemistry, Polish Academy of Sciences, Z. Noskowskiego 12/14, PL-61704 Poznan, Poland, Department of Chemistry, H. C. Ørsted Institute, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark, and Institute of Theoretical Physics and Astronomy, Vilnius University, Gostauto 12, LT-01108 Vilnius, Lithuania
| | - Zofia Gdaniec
- Faculty of Physics, Vilnius University, Sauletekio 9-3, LT-10222 Vilnius, Lithuania, Institute of Bioorganic Chemistry, Polish Academy of Sciences, Z. Noskowskiego 12/14, PL-61704 Poznan, Poland, Department of Chemistry, H. C. Ørsted Institute, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark, and Institute of Theoretical Physics and Astronomy, Vilnius University, Gostauto 12, LT-01108 Vilnius, Lithuania
| | - Kestutis Aidas
- Faculty of Physics, Vilnius University, Sauletekio 9-3, LT-10222 Vilnius, Lithuania, Institute of Bioorganic Chemistry, Polish Academy of Sciences, Z. Noskowskiego 12/14, PL-61704 Poznan, Poland, Department of Chemistry, H. C. Ørsted Institute, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark, and Institute of Theoretical Physics and Astronomy, Vilnius University, Gostauto 12, LT-01108 Vilnius, Lithuania
| | - Jelena Tamuliene
- Faculty of Physics, Vilnius University, Sauletekio 9-3, LT-10222 Vilnius, Lithuania, Institute of Bioorganic Chemistry, Polish Academy of Sciences, Z. Noskowskiego 12/14, PL-61704 Poznan, Poland, Department of Chemistry, H. C. Ørsted Institute, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark, and Institute of Theoretical Physics and Astronomy, Vilnius University, Gostauto 12, LT-01108 Vilnius, Lithuania
| |
Collapse
|
6
|
Marczak W, Kiełek K, Czech B, Flakus H, Rogalski M. Complexes of 2,6-dimethylpyridine with water in condensed phases and the dynamical co-operative interactions involving hydrogen bonds. Phys Chem Chem Phys 2009; 11:2668-78. [DOI: 10.1039/b818747a] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
7
|
Balevicius V, Gdaniec Z, Aidas K. NMR and DFT study on media effects on proton transfer in hydrogen bonding: concept of molecular probe with an application to ionic and super-polar liquids. Phys Chem Chem Phys 2009; 11:8592-600. [DOI: 10.1039/b819666d] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|