1
|
Zborowski KK, Mohammadpour M, Sadeghi A, Proniewicz LM. Theoretical study on the molecular tautomerism of the 3-hydroxy-pyridin-4-one system. Mol Phys 2013. [DOI: 10.1080/00268976.2012.760052] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
2
|
Vallejos MM, Lamsabhi AM, Peruchena NM, Mó O, Yáñez M. Microsolvation of morpholine, a bidentate base - the importance of cooperativity. J PHYS ORG CHEM 2013. [DOI: 10.1002/poc.3053] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Margarita M. Vallejos
- Laboratorio de Estructura Molecular y Propiedades, Área de Química Física, Departamento de Química, Facultad de Ciencias Exactas y Naturales y Agrimensura; Universidad Nacional del Nordeste; Avda. Libertad 5460 (3400) Corrientes Argentina
| | - Al Mokhtar Lamsabhi
- Departamento de Química, Facultad de Ciencias, Módulo 13, Campus de Excelencia UAM-CSIC; Universidad Autónoma de Madrid; Cantoblanco 28049 Madrid Spain
| | - Nélida M. Peruchena
- Laboratorio de Estructura Molecular y Propiedades, Área de Química Física, Departamento de Química, Facultad de Ciencias Exactas y Naturales y Agrimensura; Universidad Nacional del Nordeste; Avda. Libertad 5460 (3400) Corrientes Argentina
| | - Otilia Mó
- Departamento de Química, Facultad de Ciencias, Módulo 13, Campus de Excelencia UAM-CSIC; Universidad Autónoma de Madrid; Cantoblanco 28049 Madrid Spain
| | - Manuel Yáñez
- Departamento de Química, Facultad de Ciencias, Módulo 13, Campus de Excelencia UAM-CSIC; Universidad Autónoma de Madrid; Cantoblanco 28049 Madrid Spain
| |
Collapse
|
3
|
Cirtog M, Alikhani ME, Madebène B, Soulard P, Asselin P, Tremblay B. Bonding Nature and Vibrational Signatures of Oxirane:(Water)n=1–3. Assessment of the Performance of the Dispersion-Corrected DFT Methods Compared to the ab initio Results and Fourier Transform Infrared Experimental Data. J Phys Chem A 2011; 115:6688-701. [DOI: 10.1021/jp202867t] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- M. Cirtog
- UPMC Université Paris 06, UMR 7075, Laboratoire de Dynamique, Interactions et Réactivité (LADIR), F-75005, Paris, France
- CNRS, UMR 7075, Laboratoire de Dynamique, Interactions et Réactivité (LADIR), F-75005, Paris, France
| | - M. E. Alikhani
- UPMC Université Paris 06, UMR 7075, Laboratoire de Dynamique, Interactions et Réactivité (LADIR), F-75005, Paris, France
- CNRS, UMR 7075, Laboratoire de Dynamique, Interactions et Réactivité (LADIR), F-75005, Paris, France
| | - B. Madebène
- UPMC Université Paris 06, UMR 7075, Laboratoire de Dynamique, Interactions et Réactivité (LADIR), F-75005, Paris, France
- CNRS, UMR 7075, Laboratoire de Dynamique, Interactions et Réactivité (LADIR), F-75005, Paris, France
| | - P. Soulard
- UPMC Université Paris 06, UMR 7075, Laboratoire de Dynamique, Interactions et Réactivité (LADIR), F-75005, Paris, France
- CNRS, UMR 7075, Laboratoire de Dynamique, Interactions et Réactivité (LADIR), F-75005, Paris, France
| | - P. Asselin
- UPMC Université Paris 06, UMR 7075, Laboratoire de Dynamique, Interactions et Réactivité (LADIR), F-75005, Paris, France
- CNRS, UMR 7075, Laboratoire de Dynamique, Interactions et Réactivité (LADIR), F-75005, Paris, France
| | - B. Tremblay
- UPMC Université Paris 06, UMR 7075, Laboratoire de Dynamique, Interactions et Réactivité (LADIR), F-75005, Paris, France
- CNRS, UMR 7075, Laboratoire de Dynamique, Interactions et Réactivité (LADIR), F-75005, Paris, France
| |
Collapse
|
4
|
Sanz P, Mó O, Yáñez M, Elguero J. Bonding in tropolone, 2-aminotropone, and aminotroponimine: no evidence of resonance-assisted hydrogen-bond effects. Chemistry 2008; 14:4225-32. [PMID: 18381721 DOI: 10.1002/chem.200701827] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The properties of the intramolecular hydrogen bond (IMHB) in tropolone, aminotropone, and aminotroponimine have been compared with those in the corresponding saturated analogues at the B3LYP/6-311+G(3df,2p)//B3LYP/6-311+G(d,p) level of theory. In general, all those compounds in which the seven-membered ring is unsaturated exhibit a stronger IMHB than their saturated counterparts. Nevertheless, this enhanced strength is not primarily due to resonance-assisted hydrogen-bond effects, but to the much higher intrinsic basicity and acidity of the hydrogen-bond acceptor and donor groups, respectively, in the unsaturated compounds. These acidity and basicity enhancements have a double origin: 1) the unsaturated nature of the moiety to which the hydrogen-bond donor and acceptor are attached and 2) the cyclic nature of the compounds under scrutiny. As has been found for hydroxymethylene and aminomethylene cyclobutanones, and cyclobutenones and their nitrogen-containing analogues, the IMHB strength follows the [donor, acceptor] trend: [OH, C=NH]>[OH, C=O]>[NH(2), C=NH]>[NH(2), C=O] and fulfills a Steiner-Limbach correlation similar to that followed by intermolecular hydrogen bonds.
Collapse
Affiliation(s)
- Pablo Sanz
- Departamento de Química, C-9, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | | | | | | |
Collapse
|
5
|
Zborowski K, Proniewicz LM. Theoretical studies on aromaticity of selected hydroxypyrones and their cations and anions. Part 2. Electron delocalisation in the OCCO group. J PHYS ORG CHEM 2008. [DOI: 10.1002/poc.1294] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
6
|
Gomes JRB, da Silva MAVR. Computational study on the bond dissociation enthalpies in the enolic and ketonic forms of beta-diketones: their influence on metal-ligand bond enthalpies. J Phys Chem A 2007; 110:13948-55. [PMID: 17181355 DOI: 10.1021/jp064286r] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A computational study on the thermodynamic properties of 13 beta-diketones is presented. The B3LYP//6-311+G(2d,2p)//B3LYP/6-31G(d) theoretical approach was employed to compute the O-H and C-H bond dissociation enthalpies and enthalpy of tautomerization and to estimate standard gas-phase enthalpies of formation for the radicals and for the parent molecules. The gas-phase enthalpies of formation for the neutral molecules are in excellent agreement with available experimental data, supporting the estimates made for the radicals. The latter are very important for the clarification of the thermochemistry of many beta-diketonato metal complexes previously reported in the literature. Importantly, when substituents R = -CHR' are attached to the beta-diketone's scaffold, C-H homolytic bond cleavage is always favored with respect to O-H bond scission.
Collapse
Affiliation(s)
- José R B Gomes
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre 687, P-4169-007 Porto, Portugal
| | | |
Collapse
|
7
|
Jianlin Y, Yaxian Y, Renao G. Raman spectroscopic studies on tropolone complexes with La, Nd, Sm, Yb. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2006; 64:1072-6. [PMID: 16458049 DOI: 10.1016/j.saa.2005.09.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2005] [Accepted: 09/16/2005] [Indexed: 05/06/2023]
Abstract
The complexes of tropolone (HL) with different lanthanide metals of lanthanum (La), neodymium (Nd), samarium (Sm), ytterbium (Yb) have been prepared respectively in the non-aqueous solution by the direct electrochemical oxidation of sacrificial metal anodes, and characterized by normal Raman spectroscopy. By comparing the spectra of the ligands and their complexes, the stretching vibrational band of OH disappeared in complexes, and the frequencies shifts of some relevant bands were observed, particularly for the stretching vibration of CO. In the low frequency region, new metal ion sensitive bands at 400-700 cm(-1) were observed, which could be assigned to the stretching vibrational mode of the bonding of lanthanide with oxygen. The stretching vibration of lanthanide-oxygen of tropolonate complexes showed a metal ion sensitivity. All the obvious change in spectral feature of Raman spectra revealed that CO and OH were coordinated with the center metal ions through oxygen atoms. Based on Raman results, the structures of the above complexes were proposed.
Collapse
Affiliation(s)
- Yao Jianlin
- Department of Chemistry, Suzhou University, 1 Shizi Street, Suzhou 215006, China.
| | | | | |
Collapse
|
8
|
Melo A, Alfaia AJI, Reis JCR, Calado ART. Unusual Solvent Effect on a SN2 Reaction. A Quantum-Mechanical and Kinetic Study of the Menshutkin Reaction between 2-Amino-1-methylbenzimidazole and Iodomethane in the Gas Phase and in Acetonitrile. J Phys Chem B 2006; 110:1877-88. [PMID: 16471759 DOI: 10.1021/jp055660a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The quaternization reaction between 2-amino-1-methylbenzimidazole and iodomethane was investigated in the gas phase and in liquid acetonitrile. Both experimental and theoretical techniques were used in this study. In the experimental part of this work, accurate second-order rate constants were obtained for this reaction in acetonitrile from conductivity data in the 293-323 K temperature range and at ambient pressure. From two different empirical equations describing the effect of temperature on reaction rates, thermodynamic functions of activation were calculated. In the theoretical part of this work, the mechanism of this reaction was investigated in the gas phase and in acetonitrile. Two different quantum levels (B3LYP/[6-311++G(3df,3pd)/LanL2DZ]//B3LYP/[6-31G(d)/LanL2DZ] and B3LYP/[6-311++G(3df,3pd)/LanL2DZ]//B3LYP/[6-31+G(d)/LanL2DZ]) were used in the calculations, and the acetonitrile environment was modeled using the polarized continuum model (PCM). In addition, an atoms in molecules (AIM) analysis was made aiming to characterize possible hydrogen bonding. The results obtained by both techniques are in excellent agreement and lead to new insight into the mechanism of the reaction under examination. These include the identification and thermodynamic characterization of the relevant stationary species, the rationalization of the mechanistic role played by the solvent and the amine group adjacent to the nucleophile nitrogen atom, the proposal of alternative paths on the modeled potential energy surfaces, and the origin of the marked non-Arrhenius behavior of the kinetic data in solvent acetonitrile. In particular, the AIM analysis confirmed the operation of intermolecular hydrogen bonds between reactants and between products, both in the gas phase and in solution. It is also concluded that the unusual solvent effect on this Menshutkin reaction stems from the conjunction of a nucleophile possessing a relatively complex chemical structure with a dipolar aprotic solvent that is protophobic.
Collapse
Affiliation(s)
- André Melo
- REQUIMTE/Departamento de Química, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal.
| | | | | | | |
Collapse
|
9
|
Musin RN, Mariam YH. An integrated approach to the study of intramolecular hydrogen bonds in malonaldehyde enol derivatives and naphthazarin: trend in energetic versus geometrical consequences. J PHYS ORG CHEM 2006. [DOI: 10.1002/poc.1102] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
10
|
Longarte A, Unamuno I, Fernández JA, Castaño F, Redondo C. Experimental and theoretical study of the structures and binding energies of eugenol (H[sub 2]O)[sub n], n=0–2. J Chem Phys 2004; 121:209-19. [PMID: 15260539 DOI: 10.1063/1.1738646] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Eugenol (4-Allyl-2-methoxyphenol), a phenol-derivative with an intramolecular -OH ...OCH(3) hydrogen bond (H bond), has been studied in a supersonic expansion using a number of complementary laser spectroscopic techniques. The mass-resolved excitation spectrum of eugenol and its water complexes are reported for the first time. The most intense set of bands on the resonantly enhanced multiphoton ionization (REMPI) spectrum of eugenol originate in a conformer whose S(1)<--S(0) transition is at 35 202 cm(-1) and the ionization threshold at (I(0)<--S(0)) 62 544+/-150 cm(-1) (7.755+/-0.019 eV). In addition, two low intensity features redshifted with respect to the 0(0) (0) transition have been identified as due to a second, less stable conformer. Ab initio calculations show that the potential energy landscape depicts at least three minima associated with one folded and two extended conformers, one of which is the most stable. Clusters of eugenol/water were prepared in a supersonic expansion by seeding eugenol and water in noble gas He and examined by two-color REMPI (R2PI) and IR-UV double resonance spectroscopies. Only one single isomer was observed for both 1:1 and 1:2 complexes, in contrast with the several stable conformers provided by the computations. The dissociation energies of the 1:1 and 1:2 complexes have been determined by the fragmentation threshold method and the results compared with those from ab initio calculations conducted at the B3LYP and MP2 levels with a variety of basis sets.
Collapse
Affiliation(s)
- Asier Longarte
- Departamento de Química-Física, Facultad de Ciencias, Universidad del País Vasco, Apart. 644, 48080 Bilbao, Spain
| | | | | | | | | |
Collapse
|
11
|
Lee GY, Kim OJ. DFT Studies on Hydrogen Bonding in Water Complexes of Amino-substituted Pyridine. JOURNAL OF THE KOREAN CHEMICAL SOCIETY-DAEHAN HWAHAK HOE JEE 2003. [DOI: 10.5012/jkcs.2003.47.2.096] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
12
|
Sanz P, Mó O, Yáñez M. Characterization of intramolecular hydrogen bonds and competitive chalcogen–chalcogen interactions on the basis of the topology of the charge density. Phys Chem Chem Phys 2003. [DOI: 10.1039/b304699k] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
13
|
|
14
|
Hole-burning spectra of tropolone–(CO2)n (n=1,2) van der Waals complexes and density functional study. Chem Phys 2001. [DOI: 10.1016/s0301-0104(01)00399-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
15
|
Fernández JA, Longarte A, Unamuno I, Castaño F. Experimental and theoretical study of methyl-p-aminobenzoate/ammonia complexes. I. MAB(NH3)1. J Chem Phys 2000. [DOI: 10.1063/1.1311616] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
16
|
Dkhissi A, Adamowicz L, Maes G. Theoretical Investigation of the Interaction between 2-Pyridone/2-Hydroxypyridine and Ammonia. J Phys Chem A 2000. [DOI: 10.1021/jp0001586] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ahmed Dkhissi
- Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B30001 Heverlee, Belgium, and Department of Chemistry, University of Arizona, Tucson, Arizona 85721
| | - Ludwik Adamowicz
- Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B30001 Heverlee, Belgium, and Department of Chemistry, University of Arizona, Tucson, Arizona 85721
| | - Guido Maes
- Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B30001 Heverlee, Belgium, and Department of Chemistry, University of Arizona, Tucson, Arizona 85721
| |
Collapse
|
17
|
Pápai I, Jancsó G. Hydrogen Bonding in Methyl-Substituted Pyridine−Water Complexes: A Theoretical Study. J Phys Chem A 2000. [DOI: 10.1021/jp994094e] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Imre Pápai
- Institute of Isotope and Surface Chemistry, Chemical Research Centre, Spectroscopy Department, H-1525 Budapest, P.O.B. 77, Hungary
| | - Gábor Jancsó
- KFKI Atomic Energy Research Institute, Physical Chemistry Department, H-1525 Budapest, P.O.B. 49, Hungary
| |
Collapse
|
18
|
Longarte A, Fernández JA, Unamuno I, Castaño F. Isomer structures and vibrational assignment of the methyl-p-aminobenzoate(H2O)1 complex. J Chem Phys 2000. [DOI: 10.1063/1.480927] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|