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Bourcier S, Chiaa RX, Mimbong RNB, Bouchoux G. Gas-phase lithium cation affinity of glycine. EUROPEAN JOURNAL OF MASS SPECTROMETRY (CHICHESTER, ENGLAND) 2015; 21:149-159. [PMID: 26307695 DOI: 10.1255/ejms.1299] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The gas-phase lithium cation binding thermochemistry of glycine has been determined theoretically by quantum chemical calculations at the G4 level and experimentally by the extended kinetic method using electrospray ionization quadrupole time-of-flight tandem mass spectrometry. The lithium cation affinity of glycine, ∆(Li)H°(298)(GLY), i.e. the∆(Li)H°(298) of the reaction GlyLi(+)→ Gly + Li(+)) given by the G4 method is equal to 241.4 kJ.mol(-1) if only the most stable conformer of glycine is considered or to 242.3 kJ.mol(-1) if the 298K equilibrium mixture of neutral conformers is included in the calculation. The ∆(Li)H°(298)(GLY) deduced from the extended kinetic method is obviously dependent on the choice of the Li(+) affinity scale, thus∆(Li)H°(298)(GLY) is equal to 228.7±0.9(2.0) kJ.mol(- 1) if anchored to the recently re-evaluated lithium cation affinity scale but shifted to 235.4±1.0 kJ.mol(-1) if G4 computed lithium cation affinities of the reference molecules is used. This difference of 6.3 kJ.mol(-1) may originate from a compression of the experimental lithium affinity scale in the high ∆(Li)H°(298) region. The entropy change associated with the reaction GlyLi(+)→Gly + Li(+) reveals a gain of approximately 15 J.mol(-) 1.K(-1) with respect to monodentate Li(+) acceptors. The origin of this excess entropy is attributed to the bidentate interaction between the Li(+) cation and both the carbonyl oxygen and the nitrogen atoms of glycine. The computed G4 Gibbs free energy,∆(Li)G°(298)(GLY) is equal to 205.3 kJ.mol(-1), a similar result, 201.0±3.4 kJ.mol(-1), is obtained from the experiment if the∆(Li)G°(298) of the reference molecules is anchored on the G4 results.
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Affiliation(s)
- Sophie Bourcier
- Laboratoire de Chimie Moléculaire. Ecole Polytechnique. UMR 9168 CNRS 91128 Palaiseau, France.
| | - Ru Xuan Chiaa
- N anyang Technological University. 21 Nanyang Link. 637371 Singapore
| | | | - Guy Bouchoux
- Laboratoire de Chimie Moléculaire. Ecole Polytechnique. UMR 9168 CNRS. 91128 Palaiseau, France. Université Paris-Sud XI. 91400 Orsay, France.
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Mayeux C, Burk P, Gal JF, Kaljurand I, Koppel I, Leito I, Sikk L. Gas-phase lithium cation basicity: revisiting the high basicity range by experiment and theory. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2014; 25:1962-1973. [PMID: 25190215 DOI: 10.1007/s13361-014-0970-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Revised: 07/14/2014] [Accepted: 07/14/2014] [Indexed: 06/03/2023]
Abstract
According to high level calculations, the upper part of the previously published FT-ICR lithium cation basicity (LiCB at 373 K) scale appeared to be biased by a systematic downward shift. The purpose of this work was to determine the source of this systematic difference. New experimental LiCB values at 373 K have been measured for 31 ligands by proton-transfer equilibrium techniques, ranging from tetrahydrofuran (137.2 kJ mol(-1)) to 1,2-dimethoxyethane (202.7 kJ mol(-1)). The relative basicities (ΔLiCB) were included in a single self-consistent ladder anchored to the absolute LiCB value of pyridine (146.7 kJ mol(-1)). This new LiCB scale exhibits a good agreement with theoretical values obtained at G2(MP2) level. By means of kinetic modeling, it was also shown that equilibrium measurements can be performed in spite of the formation of Li(+) bound dimers. The key feature for achieving accurate equilibrium measurements is the ion trapping time. The potential causes of discrepancies between the new data and previous experimental measurements were analyzed. It was concluded that the disagreement essentially finds its origin in the estimation of temperature and the calibration of Cook's kinetic method.
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Romanov V, Siu CK, Verkerk UH, Aribi HE, Hopkinson AC, Siu KWM. Binding Energies of the Silver Ion to Alcohols and Amides: A Theoretical and Experimental Study. J Phys Chem A 2008; 112:10912-20. [DOI: 10.1021/jp8055653] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vladimir Romanov
- Department of Chemistry and Centre for Research in Mass Spectrometry, York University, 4700 Keele Street, Toronto, Ontario, Canada M3J 1P3, and MDS Analytical Technologies, 71 Four Valley Drive, Concord, Ontario, Canada L4K 4V8
| | - Chi-Kit Siu
- Department of Chemistry and Centre for Research in Mass Spectrometry, York University, 4700 Keele Street, Toronto, Ontario, Canada M3J 1P3, and MDS Analytical Technologies, 71 Four Valley Drive, Concord, Ontario, Canada L4K 4V8
| | - Udo H. Verkerk
- Department of Chemistry and Centre for Research in Mass Spectrometry, York University, 4700 Keele Street, Toronto, Ontario, Canada M3J 1P3, and MDS Analytical Technologies, 71 Four Valley Drive, Concord, Ontario, Canada L4K 4V8
| | - Houssain El Aribi
- Department of Chemistry and Centre for Research in Mass Spectrometry, York University, 4700 Keele Street, Toronto, Ontario, Canada M3J 1P3, and MDS Analytical Technologies, 71 Four Valley Drive, Concord, Ontario, Canada L4K 4V8
| | - Alan C. Hopkinson
- Department of Chemistry and Centre for Research in Mass Spectrometry, York University, 4700 Keele Street, Toronto, Ontario, Canada M3J 1P3, and MDS Analytical Technologies, 71 Four Valley Drive, Concord, Ontario, Canada L4K 4V8
| | - K. W. Michael Siu
- Department of Chemistry and Centre for Research in Mass Spectrometry, York University, 4700 Keele Street, Toronto, Ontario, Canada M3J 1P3, and MDS Analytical Technologies, 71 Four Valley Drive, Concord, Ontario, Canada L4K 4V8
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Antol I, Barbatti M, Eckert-Maksić M, Lischka H. Quantum chemical calculations of electronically excited states: formamide, its protonated form and alkali cation complexes as case studies. MONATSHEFTE FUR CHEMIE 2008. [DOI: 10.1007/s00706-007-0803-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Ho DS, DeYonker NJ, Wilson AK, Cundari TR. Accurate Enthalpies of Formation of Alkali and Alkaline Earth Metal Oxides and Hydroxides: Assessment of the Correlation Consistent Composite Approach (ccCA). J Phys Chem A 2006; 110:9767-70. [PMID: 16884209 DOI: 10.1021/jp062624i] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Computing the enthalpies of formation for alkali metal and alkaline earth metal oxides (M(x)O) and hydroxides [M(OH)(n)] using the Gaussian-n (Gn) and Weismann-n (Wn) ab initio model chemistries is difficult due to an improper treatment of core-valence electron correlation effects. Using a new model chemistry called the correlation consistent Composite Approach (ccCA), enthalpies of formation were determined for eight different alkali/alkaline earth metal oxides and hydroxides. Unlike the Gn and Wn model chemistries, which must be modified to properly account for core-valence electron correlation, the standard implementations of the ccCA provide acceptable results, and all enthalpies of formation obtained with the ccCA are within the accepted range of recommended values.
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Affiliation(s)
- Dustin S Ho
- Center for Advanced Scientific Computing and Modeling (CASCam), Department of Chemistry, University of North Texas, Denton, TX 76203-5070, USA
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Maria PC, Massi L, Box NS, Gal JF, Burk P, Tammiku-Taul J, Kutsar M. Bonding energetics in clusters formed by cesium salts: a study by collision-induced dissociation and density functional theory. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2006; 20:2057-62. [PMID: 16755612 DOI: 10.1002/rcm.2552] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
In relation to the interaction between (137)Cs and soil organic matter, electrospray mass spectrometry experiments and density functional theory (DFT) calculations were carried out on the dissociation of positively charged adducts formed by cesium nitrate and cesium organic salts attached to a cesium cation [Cs(CsNO(3))(CsA)](+) (A = benzoate, salicylate, hydrogen phthalate, hydrogen maleate, hydrogen fumarate, hydrogen oxalate, and hydrogen malonate ion). These mixed clusters were generated by electrospray from methanol solutions containing cesium nitrate and an organic acid. Collision-induced dissociation of [Cs(CsNO(3))(CsA)](+) in a quadrupole ion trap gave [Cs(CsNO(3))](+) and [Cs(CsA)](+) as major product ions. Loss of HNO(3) was observed, and also CO(2) loss in the case of A = hydrogen malonate. Branching ratios for the dissociation into [Cs(CsNO(3))](+) and [Cs(CsA)](+) were treated by the Cooks' kinetic method to obtain a quantitative order of bonding energetics (enthalpies and Gibbs free energies) between Cs(+) and the molecular salt (ion pair) CsA, and were correlated with the corresponding values calculated using DFT. The kinetic method leads to relative scales of Cs(+) affinities and basicities that are consistent with the DFT-calculated values. This study brings new data on the strong interaction between the cesium cation and molecular salts CsA.
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Affiliation(s)
- Pierre-Charles Maria
- Laboratoire de Radiochimie, Sciences Analytiques et Environnement, and Plate-forme Technologique-Spectrométrie de Masse, Faculté des Sciences, Université de Nice Sophia-Antipolis, Parc Valrose, 06108 Nice Cedex 2, France
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Schroeder OE, Andriole EJ, Carver KL, Colyer KE, Poutsma JC. Proton Affinity of Lysine Homologues from the Extended Kinetic Method. J Phys Chem A 2003. [DOI: 10.1021/jp0359182] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Olivia E. Schroeder
- Department of Chemistry, The College of William and Mary in Virginia, Williamsburg, Virginia 23187-8795
| | - Erica J. Andriole
- Department of Chemistry, The College of William and Mary in Virginia, Williamsburg, Virginia 23187-8795
| | - Krista L. Carver
- Department of Chemistry, The College of William and Mary in Virginia, Williamsburg, Virginia 23187-8795
| | - Kathryn E. Colyer
- Department of Chemistry, The College of William and Mary in Virginia, Williamsburg, Virginia 23187-8795
| | - John C. Poutsma
- Department of Chemistry, The College of William and Mary in Virginia, Williamsburg, Virginia 23187-8795
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Gal JF, Maria PC, Decouzon M, Mó O, Yáñez M, Abboud JLM. Lithium-cation/pi complexes of aromatic systems. The effect of increasing the number of fused rings. J Am Chem Soc 2003; 125:10394-401. [PMID: 12926964 DOI: 10.1021/ja029843b] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The gas-phase lithium cation basicities (LCBs) of naphthalene, azulene, anthracene, and phenanthrene were measured by means of Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry. The structures of the corresponding complexes and their relative stabilities were investigated at the B3LYP/6-311+G(3df,2p)//B3LYP/6-31G(d) level of theory. In the theoretical survey, pyrene, coronene, [3]phenylene, angular [3]phenylene, and circumcoronene were also included. The strength of the binding to a given aromatic cycle decreases as the number of cycles directly fused to it increases. Hence, the stability of the outer pi-complexes, in which Li(+) is attached to the peripheral rings, is systematically greater than that of the complexes in which the metal is attached to the inner rings. The energy gap between these local minima decreases as the number of fused rings in the system increases. This result seems to indicate that, as the size of the system increases, the rings tend to lose their peculiarities, in such a way that in the limit of a graphite sheet all rings would exhibit identical characteristics and reactivity. The good agreement between calculated LCBs and experimental values lends support to the enhanced stability of the outer complexes. The activation barriers connecting these local minima decrease as the number of fused cycles increases, but seems to tend toward a limit. [3]Phenylene and angular [3]phenylene exhibit enhanced LCBs reflecting nonnegligible Mills-Nixon effects that increase the electron-donor properties of these annelated benzenes.
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Affiliation(s)
- Jean-François Gal
- Chimie des Matériaux Organiques et Métalliques, Université de Nice-Sophia Antipolis, Parc Valrose, 06108 Nice Cedex 2, France
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Abirami S, Ma N, Goh N. A Gaussian-3 (G3) theoretical study of the interactions between alkali metal cations and polyhydroxyl ligands. Chem Phys Lett 2002. [DOI: 10.1016/s0009-2614(02)00743-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Current literature in mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2002; 37:545-556. [PMID: 12112761 DOI: 10.1002/jms.252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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