1
|
Spectrophotometric Determination of Formation Constants of Iron(III) Complexes with Several Ligands. CHEMISTRY 2022. [DOI: 10.3390/chemistry4030050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Dye-sensitized solar cells transform solar light into electricity. One commonly used dye is a ruthenium complex. However, the use of ruthenium has been shown to have several disadvantages. In this study, via singular spectrum analysis using HypSpec software, we determined the formation constants and calculated individual electronic spectra of species of iron(III) with several ligands (1,2-diaminoethane, 1,3-diaminopropane, 1,4-diaminobutane, 2,2′-bipyridyl, 5,5-dimethyl-2,2′-bipyridyl, 4,4′-di-tert-butyl-2,2′-bipyridyl, 1,10-phenanthroline, and 3,4,7,8-tetramethyl-1,10-phenanthroline) in methanol solution. We present a spectral comparison of the complexes reported here to the ruthenium complex: tris-(2,2′-bipyridyl)ruthenium(II).
Collapse
|
2
|
Segoviano-Garfias JJN, Zanor GA, Ávila-Ramos F, Bivián-Castro EY. Equilibrium Studies of Iron (III) Complexes with Either Pyrazine, Quinoxaline, or Phenazine and Their Catecholase Activity in Methanol. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27103257. [PMID: 35630733 PMCID: PMC9143456 DOI: 10.3390/molecules27103257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 05/09/2022] [Accepted: 05/15/2022] [Indexed: 11/21/2022]
Abstract
Currently, catalysts with oxidative activity are required to create valuable chemical, agrochemical, and pharmaceutical products. The catechol oxidase activity is a model reaction that can reveal new oxidative catalysts. The use of complexes as catalysts using iron (III) and structurally simple ligands such as pyrazine (pz), quinoxaline (qx), and phenazine (fz) has not been fully explored. To characterize the composition of the solution and identify the abundant species which were used to catalyze the catechol oxidation, the distribution diagrams of these species were obtained by an equilibrium study using a modified Job method in the HypSpec software. This allows to obtain also the UV-vis spectra calculated and the formation constants for the mononuclear and binuclear complexes with Fe3+ including: [Fe(pz)]3+, [Fe2(pz)]6+, [Fe(qx)]3+, [Fe2(qx)]6+, [Fe(fz)]3+, and [Fe2(fz)]6+. The formation constants obtained were log β110 = 3.2 ± 0.1, log β210 = 6.9 ± 0.1, log β110 = 4.4 ± 0.1, log β210 = 8.3 ± 0.1, log β110 = 6.4 ± 0.2, and log β210 = 9.9 ± 0.2, respectively. The determination of the catechol oxidase activity for these complexes did not follow a traditional Michaelis–Menten behavior.
Collapse
Affiliation(s)
- José J. N. Segoviano-Garfias
- División de Ciencias de la Vida (DICIVA), Campus Irapuato-Salamanca, Universidad de Guanajuato, Ex Hacienda El Copal, Carretera Irapuato-Silao Km. 9, Irapuato 36500, Mexico; (G.A.Z.); (F.Á.-R.)
- Correspondence: ; Tel.: +52-47-3740-5320
| | - Gabriela A. Zanor
- División de Ciencias de la Vida (DICIVA), Campus Irapuato-Salamanca, Universidad de Guanajuato, Ex Hacienda El Copal, Carretera Irapuato-Silao Km. 9, Irapuato 36500, Mexico; (G.A.Z.); (F.Á.-R.)
| | - Fidel Ávila-Ramos
- División de Ciencias de la Vida (DICIVA), Campus Irapuato-Salamanca, Universidad de Guanajuato, Ex Hacienda El Copal, Carretera Irapuato-Silao Km. 9, Irapuato 36500, Mexico; (G.A.Z.); (F.Á.-R.)
| | - Egla Yareth Bivián-Castro
- Centro Universitario de los Lagos, Universidad de Guadalajara, Enrique Díaz de León 1144, Col. Paseos de la Montaña, Lagos de Moreno 47460, Mexico;
| |
Collapse
|
3
|
Solution Equilibria Formation of Manganese(II) Complexes with Ethylenediamine, 1,3-Propanediamine and 1,4-ButanediaMine in Methanol. MOLBANK 2022. [DOI: 10.3390/m1367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Manganese is an abundant element that plays critical roles and is at the reaction center of several enzymes. In order to promote an understanding of the behavior of manganese(II) ion with several aliphatic ligands, in this work, the stability and spectral behavior of the complexes with manganese(II) and ethylenediamine, 1,3-propanediamine or 1,4-butanediamine were explored. A spectrophotometric study of its speciation in methanol was performed at 293 K. The formation constants obtained for these systems were: manganese(II)-ethylenediamine log β110 = 3.98 and log β120 = 7.51; for the manganese(II)-1,3-propanediamine log β110 = 5.08 and log β120 = 8.66; and for manganese(II)-1,4-butanediamine log β110 = 4.36 and log β120 = 8.46. These results were obtained by fitting the experimental spectrophotometric data using the HypSpec software. The complexes reported in this study show a spectral pattern that could be related to a chelate effect in which the molar absorbance is not directly related to the increase in the carbon chain of the ligands.
Collapse
|
4
|
Segoviano-Garfias JJN, Zanor GA, Ávila-Ramos F, Bivián-Castro EY. Stability of Manganese(II)-Pyrazine, -Quinoxaline or -Phenazine Complexes and Their Potential as Carbonate Sequestration Agents. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27051648. [PMID: 35268748 PMCID: PMC8911680 DOI: 10.3390/molecules27051648] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 02/27/2022] [Accepted: 02/28/2022] [Indexed: 11/29/2022]
Abstract
Carbonate sequestration technology is a complement of CO2 sequestration technology, which might assure its long-term viability. In this work, in order to explore the interactions between Mn2+ ion with several ligands and carbonate ion, we reported a spectrophotometric equilibrium study of complexes of Mn2+ with pyrazine, quinoxaline or phenazine and its carbonate species at 298 K. For the complexes of manganese(II)–pyrazine, manganese(II)–quinoxaline and manganese(II)–phenazine, the formation constants obtained were log β110 = 4.6 ± 0.1, log β110 = 5.9 ± 0.1 and log β110 = 6.0 ± 0.1, respectively. The formation constants for the carbonated species manganese(II)–carbonate, manganese(II)–pyrazine–carbonate, manganese(II)–quinoxaline–carbonate and manganese(II)–phenazine–carbonate complexes were log β110 = 5.1 ± 0.1, log β110 = 9.8 ± 0.1, log β110 = 11.7 ± 0.1 and log β110 = 12.7 ± 0.1, respectively. Finally, the individual calculated electronic spectra and its distribution diagram of these species are also reported. The use of N-donor ligand with π-electron-attracting activity in a manganese(II) complex might increase its interaction with carbonate ions.
Collapse
Affiliation(s)
- José J. N. Segoviano-Garfias
- División de Ciencias de la Vida (DICIVA), Universidad de Guanajuato, Campus Irapuato-Salamanca, Ex Hacienda El Copal, Carretera Irapuato-Silao Km. 9, Irapuato 36500, Mexico; (G.A.Z.); (F.Á.-R.)
- Correspondence: ; Tel.: +52-(473)-740-5320
| | - Gabriela A. Zanor
- División de Ciencias de la Vida (DICIVA), Universidad de Guanajuato, Campus Irapuato-Salamanca, Ex Hacienda El Copal, Carretera Irapuato-Silao Km. 9, Irapuato 36500, Mexico; (G.A.Z.); (F.Á.-R.)
| | - Fidel Ávila-Ramos
- División de Ciencias de la Vida (DICIVA), Universidad de Guanajuato, Campus Irapuato-Salamanca, Ex Hacienda El Copal, Carretera Irapuato-Silao Km. 9, Irapuato 36500, Mexico; (G.A.Z.); (F.Á.-R.)
| | - Egla Yareth Bivián-Castro
- Centro Universitario de los Lagos, Universidad de Guadalajara, Enrique Díaz de León 1144, Col. Paseos de la Montaña, Lagos de Moreno 47460, Mexico;
| |
Collapse
|
5
|
|
6
|
Maeda H, Koshio N, Tachibana Y, Chiyonobu K, Konishi GI, Mizuno K. Diastereoselective photocycloaddition reactions of 2-naphthalenecarboxylates and 2,3-naphthalenedicarboxylates with furans governed by chiral auxiliaries and hydrogen bonding interactions. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2017.08.052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
7
|
Segoviano-Garfias JJ, Nájera-Lara M, Pérez-Arredondo MDLL, López-Ramírez V, Rubio-Jimenez C, Ramírez-Vázquez JA, Moreno-Esparza R. Spectrophotometric determination of formation constants of copper(II) complexes with 2,2′-bipyridyl, 1,10-phenanthroline and their halides in methanol. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.06.112] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
|
8
|
Synthesis, structure, and properties of a lantern-type dinuclear rhodium(II) complex cis-[Rh2(4-Me-pf)2(O2CCMe3)2], 4-Me-pf− = N,N′-di-p-tolylformamidinate anion. CHEMICAL PAPERS 2017. [DOI: 10.1007/s11696-017-0244-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
9
|
Lim JYC, Bunchuay T, Beer PD. Strong and Selective Halide Anion Binding by Neutral Halogen-Bonding [2]Rotaxanes in Wet Organic Solvents. Chemistry 2017; 23:4700-4707. [DOI: 10.1002/chem.201700030] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Indexed: 12/20/2022]
Affiliation(s)
- Jason Y. C. Lim
- Chemistry Research Laboratory, Department of Chemistry; University of Oxford; 12 Mansfield Road Oxford OX1 3TA UK
| | - Thanthapatra Bunchuay
- Chemistry Research Laboratory, Department of Chemistry; University of Oxford; 12 Mansfield Road Oxford OX1 3TA UK
| | - Paul D. Beer
- Chemistry Research Laboratory, Department of Chemistry; University of Oxford; 12 Mansfield Road Oxford OX1 3TA UK
| |
Collapse
|
10
|
González-González J, Nájera-Lara M, López-Ramírez V, Ramírez-Vázquez JA, Segoviano-Garfias JJ. Spectrophotometric determination of the formation constants of calcium(II) complexes with 2,2'-bipyridyl and 1,10-phenanthroline in acetonitrile. RESOURCE-EFFICIENT TECHNOLOGIES 2016. [DOI: 10.1016/j.reffit.2016.11.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
11
|
Chen B, Neumann R. On the effect of ion pairing of Keggin type polyanions with quaternary ammonium cations on redox potentials in organic solvents. Phys Chem Chem Phys 2016; 18:22487-93. [DOI: 10.1039/c6cp03315f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The electrochemical properties of polyoxometalates in organic solvents show an interrelation between redox potentials, solvents and ion pairing.
Collapse
Affiliation(s)
- Bo Chen
- Department of Organic Chemistry
- Weizmann Institute of Science
- Rehovot
- Israel 76100
| | - Ronny Neumann
- Department of Organic Chemistry
- Weizmann Institute of Science
- Rehovot
- Israel 76100
| |
Collapse
|
12
|
Marenich AV, Olson RM, Kelly CP, Cramer CJ, Truhlar DG. Self-Consistent Reaction Field Model for Aqueous and Nonaqueous Solutions Based on Accurate Polarized Partial Charges. J Chem Theory Comput 2015; 3:2011-33. [PMID: 26636198 DOI: 10.1021/ct7001418] [Citation(s) in RCA: 360] [Impact Index Per Article: 40.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A new universal continuum solvation model (where "universal" denotes applicable to all solvents), called SM8, is presented. It is an implicit solvation model, also called a continuum solvation model, and it improves on earlier SMx universal solvation models by including free energies of solvation of ions in nonaqueous media in the parametrization. SM8 is applicable to any charged or uncharged solute composed of H, C, N, O, F, Si, P, S, Cl, and/or Br in any solvent or liquid medium for which a few key descriptors are known, in particular dielectric constant, refractive index, bulk surface tension, and acidity and basicity parameters. It does not require the user to assign molecular-mechanics types to an atom or group; all parameters are unique and continuous functions of geometry. It may be used with any level of electronic structure theory as long as accurate partial charges can be computed for that level of theory; we recommend using it with self-consistently polarized Charge Model 4 or other self-consistently polarized class IV charges, in which case analytic gradients are available. The model separates the observable solvation free energy into two components: the long-range bulk electrostatic contribution arising from a self-consistent reaction field treatment using the generalized Born approximation for electrostatics is augmented by the non-bulk-electrostatic contribution arising from short-range interactions between the solute and solvent molecules in the first solvation shell. The cavities for the bulk electrostatics calculation are defined by superpositions of nuclear-centered spheres whose sizes are determined by intrinsic atomic Coulomb radii. The radii used for aqueous solution are the same as parametrized previously for the SM6 aqueous solvation model, and the radii for nonaqueous solution are parametrized by a training set of 220 bare ions and 21 clustered ions in acetonitrile, methanol, and dimethyl sulfoxide. The non-bulk-electrostatic terms are proportional to the solvent-accessible surface areas of the atoms of the solute and have been parametrized using solvation free energies for a training set of 2346 solvation free energies for 318 neutral solutes in 90 nonaqueous solvents and water and 143 transfer free energies for 93 neutral solutes between water and 15 organic solvents. The model is tested with three density functionals and with four basis sets: 6-31+G(d,p), 6-31+G(d), 6-31G(d), and MIDI!6D. The SM8 model achieves mean unsigned errors of 0.5-0.8 kcal/mol in the solvation free energies of tested neutrals and mean unsigned errors of 2.2-7.0 kcal/mol for ions. The model outperforms the earlier SM5.43R and SM7 universal solvation models as well as the default Polarizable Continuum Model (PCM) implemented in Gaussian 98/03, the Conductor-like PCM as implemented in GAMESS, Jaguar's continuum model based on numerical solution of the Poisson equation, and the GCOSMO model implemented in NWChem.
Collapse
Affiliation(s)
- Aleksandr V Marenich
- Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant Street S.E., Minneapolis, Minnesota 55455-0431
| | - Ryan M Olson
- Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant Street S.E., Minneapolis, Minnesota 55455-0431
| | - Casey P Kelly
- Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant Street S.E., Minneapolis, Minnesota 55455-0431
| | - Christopher J Cramer
- Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant Street S.E., Minneapolis, Minnesota 55455-0431
| | - Donald G Truhlar
- Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant Street S.E., Minneapolis, Minnesota 55455-0431
| |
Collapse
|
13
|
Complex formation equilibria of 2,2′-bipyridyl and 1,10-phenanthroline with manganese(II) in methanol. KARBALA INTERNATIONAL JOURNAL OF MODERN SCIENCE 2015. [DOI: 10.1016/j.kijoms.2015.11.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|
14
|
Hollóczki O, Malberg F, Welton T, Kirchner B. On the origin of ionicity in ionic liquids. Ion pairing versus charge transfer. Phys Chem Chem Phys 2015; 16:16880-90. [PMID: 25012230 DOI: 10.1039/c4cp01177e] [Citation(s) in RCA: 151] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
In this paper we show by using static DFT calculations and classical molecular dynamics simulations that the charge transfer between ionic liquid ions plays a major role in the observed discrepancies between the overall mobility of the ions and the observed conductivities of the corresponding ionic liquids, while it also directly suppresses the association of oppositely charged ions, thus the ion pairing. Accordingly, in electrochemical applications of these materials it is important to consider this reduction of the total charges on the ions, which can greatly affect the performance of the given process or device in which the ionic liquid is used. By slightly shifting from the salt-like to a molecular liquid-like system via the decreased charges, the charge transfer also fluidizes the ionic liquid. We believe that this vital information on the molecular level structure of ionic liquids offers a better understanding of these materials, and allows us to improve the a priori design of ionic liquids for any given purpose.
Collapse
Affiliation(s)
- Oldamur Hollóczki
- Mulliken Center for Theoretical Chemistry, University of Bonn, Beringstr. 4+6, D-53115 Bonn, Germany.
| | | | | | | |
Collapse
|
15
|
Jacewicz D, Pranczk J, Wyrzykowski D, Żamojć K, Chmurzyński L. Trans–cis isomerization of [(C6H5)3P]2PtCl2 complex in dimethylformamide solutions. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2014.06.082] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
16
|
Peng X, Deng JG, Xu HB. Substituent and solvent effects on the fluorescent and photochromic properties of 2-(2-pyridyl)imidazole containing diarylethene derivatives. RSC Adv 2013. [DOI: 10.1039/c3ra43110j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
|
17
|
Duan G, Zhu N, Yam VWW. Syntheses and Photochromic Studies of Dithienylethene-Containing Imidazolium Derivatives and Their Reactivity towards Nucleophiles. Chemistry 2010; 16:13199-209. [DOI: 10.1002/chem.201001319] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
18
|
Segoviano-Garfias JJ, Moreno-Esparza R, Mendoza-Díaz G. Spectrophotometric determination of formation constants for the Cu–ethylenediamine–halogen (chloride and bromide) system and their catalytic effect on the oxidative coupling of 2,6-di-tert-butyl-phenol. Inorganica Chim Acta 2010. [DOI: 10.1016/j.ica.2010.06.050] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
19
|
Juwarker H, Lenhardt JM, Castillo JC, Zhao E, Krishnamurthy S, Jamiolkowski RM, Kim KH, Craig SL. Anion Binding of Short, Flexible Aryl Triazole Oligomers. J Org Chem 2009; 74:8924-34. [DOI: 10.1021/jo901966f] [Citation(s) in RCA: 116] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hemraj Juwarker
- Department of Chemistry, Duke University, 124 Science Drive, Durham, North Carolina 27708
| | - Jeremy M. Lenhardt
- Department of Chemistry, Duke University, 124 Science Drive, Durham, North Carolina 27708
| | - José C. Castillo
- Department of Chemistry, Duke University, 124 Science Drive, Durham, North Carolina 27708
| | - Emily Zhao
- Department of Chemistry, Duke University, 124 Science Drive, Durham, North Carolina 27708
| | - Sibi Krishnamurthy
- Department of Chemistry, Duke University, 124 Science Drive, Durham, North Carolina 27708
| | - Ryan M. Jamiolkowski
- Department of Chemistry, Duke University, 124 Science Drive, Durham, North Carolina 27708
| | - Ki-Hyon Kim
- Department of Chemistry, Duke University, 124 Science Drive, Durham, North Carolina 27708
| | - Stephen L. Craig
- Department of Chemistry, Duke University, 124 Science Drive, Durham, North Carolina 27708
| |
Collapse
|
20
|
Gargiulli C, Gattuso G, Liotta C, Notti A, Parisi MF, Pisagatti I, Pappalardo S. Calix[5]arene-Based Heteroditopic Receptor for 2-Phenylethylamine Hydrochloride. J Org Chem 2009; 74:4350-3. [DOI: 10.1021/jo802777v] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Claudia Gargiulli
- Dipartimento di Chimica Organica e Biologica, Università di Messina, salita Sperone 31, 98166 Messina, Italy, and Dipartimento di Scienze Chimiche, Università di Catania, Viale A. Doria 6, 95125 Catania, Italy
| | - Giuseppe Gattuso
- Dipartimento di Chimica Organica e Biologica, Università di Messina, salita Sperone 31, 98166 Messina, Italy, and Dipartimento di Scienze Chimiche, Università di Catania, Viale A. Doria 6, 95125 Catania, Italy
| | - Claudia Liotta
- Dipartimento di Chimica Organica e Biologica, Università di Messina, salita Sperone 31, 98166 Messina, Italy, and Dipartimento di Scienze Chimiche, Università di Catania, Viale A. Doria 6, 95125 Catania, Italy
| | - Anna Notti
- Dipartimento di Chimica Organica e Biologica, Università di Messina, salita Sperone 31, 98166 Messina, Italy, and Dipartimento di Scienze Chimiche, Università di Catania, Viale A. Doria 6, 95125 Catania, Italy
| | - Melchiorre F. Parisi
- Dipartimento di Chimica Organica e Biologica, Università di Messina, salita Sperone 31, 98166 Messina, Italy, and Dipartimento di Scienze Chimiche, Università di Catania, Viale A. Doria 6, 95125 Catania, Italy
| | - Ilenia Pisagatti
- Dipartimento di Chimica Organica e Biologica, Università di Messina, salita Sperone 31, 98166 Messina, Italy, and Dipartimento di Scienze Chimiche, Università di Catania, Viale A. Doria 6, 95125 Catania, Italy
| | - Sebastiano Pappalardo
- Dipartimento di Chimica Organica e Biologica, Università di Messina, salita Sperone 31, 98166 Messina, Italy, and Dipartimento di Scienze Chimiche, Università di Catania, Viale A. Doria 6, 95125 Catania, Italy
| |
Collapse
|
21
|
Alkali metal n.m.r. and vibrational spectroscopic studies on solvates in non-aqueous solvents. PURE APPL CHEM 2009. [DOI: 10.1351/pac197541030275] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Collapse
|
22
|
Abstract
Abstract
Collapse
|
23
|
|
24
|
Ab initio studies of acid–base reactions in the substituted 4-nitropyridine N-oxide systems. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.theochem.2005.08.032] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
25
|
Garifzyanov AR, Zakharov SV, Nuriazdanova GK, Devyatov FV, Galkin VL, Cherkasov RA. Effect of the Medium on the Acid-Base Properties of α-Aminophosphoryl Compounds. RUSS J GEN CHEM+ 2005. [DOI: 10.1007/s11176-005-0398-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
26
|
Heterodinuclear ruthenium(II) bipyridyl-transition metal dithiocarbamate macrocycles for anion recognition and sensing. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.08.058] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
27
|
Niu Y, Sun L, Crooks RM. Determination of the Intrinsic Proton Binding Constants for Poly(amidoamine) Dendrimers via Potentiometric pH Titration. Macromolecules 2003. [DOI: 10.1021/ma034276d] [Citation(s) in RCA: 157] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yanhui Niu
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012
| | - Li Sun
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012
| | - Richard M. Crooks
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012
| |
Collapse
|
28
|
Acid–base equilibria in systems involving substituted pyridines in polar aprotic protophobic media and in the amphiprotic methanol. Anal Chim Acta 2000. [DOI: 10.1016/s0003-2670(00)00967-3] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
29
|
|
30
|
Riccieri P, Zinato E, Aliboni A. Pentacyano(pyridine)chromate(III): Synthesis, Characterization, and Photochemistry. Inorg Chem 1997; 36:2279-2286. [PMID: 11669861 DOI: 10.1021/ic9612156] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The Cr(CN)(5)(py)(2)(-) anion (py = pyridine) has been prepared by acid-promoted methanolysis of Cr(CN)(6)(3)(-) followed by reaction with pyridine, isolated as the potassium salt, and characterized by absorption spectra (lambda(max): 403 and 256 nm in H(2)O; 411 nm in Me(2)SO) and phosphorescence, observed in Me(2)SO (lambda(max), 774 nm; tau = 56 &mgr;s at 20 degrees C) but not in H(2)O. In acid aqueous solution the complex decomposes stepwise to Cr(H(2)O)(5)(py)(3+); by contrast, the thermal reaction in Me(2)SO leads to Cr(CN)(5)(Me(2)SO)(2)(-) with first-order kinetics (k(25) = 9.8 x 10(-)(7) s(-)(1), DeltaH() = 138 +/- 8 kJ mol(-)(1)). Ligand-field (LF) band irradiation results in substitution of py and CN(-). The quantum yields, measured by ligand analysis, spectrophotometry, and HPLC, are as follows: Phi(py) = 0.08, Phi(CN) = 0.01 in H(2)O (pH 7.2, phosphate buffer) and Phi(py) = 0.04, Phi(CN) = 0.002 in Me(2)SO. The preference for py release obeys the prediction of the Vanquickenborne-Ceulemans, additive angular overlap model (AOM). A notable feature of this complex is that both types of ligands are pi acceptors, and the pi effect of py on bond labilization is evidenced by comparison with the photolysis of Cr(CN)(5)(NH(3))(2)(-). Irradiation of the intense UV absorption due to overlap of charge-transfer (CT) and pi --> pi, py localized transitions causes the increase of both quantum yields, suggesting the involvement of higher-energy states besides the LF ones. Co(sep)(3+) (sep = 1,3,6,8,10,13,16,19-octaazabicyclo[6.6.6]eicosane = sepulchrate) quenches the phosphorescence (k(q) = 1.6 x 10(9) M(-)(1) s(-)(1)) but has no effect on the photoreaction efficiencies: the photochemistry is thus inferred to originate entirely from the lowest quartet excited state(s) in competition with intersystem crossing. The marked solvent effects on the absorption spectrum, on the emission behavior, on the thermal reactivity, on the photolysis quantum yields, and, in particular, on the Phi(py)/Phi(CN) ratio, are discussed in terms of the proneness of the cyanide ligand to either protonation or hydrogen bonding and of solvent orientation toward anionic complexes.
Collapse
Affiliation(s)
- Pietro Riccieri
- Dipartimento di Chimica, Università di Perugia, 06123 Perugia, Italy
| | | | | |
Collapse
|
31
|
|
32
|
Bakeev KN, Shu YM, Zezin AB, Kabanov VA, Lezov AV, Mel'nikov AB, Kolomiets IP, Rjumtsev EI, MacKnight WJ. Structure and Properties of Polyelectrolyte−Surfactant Nonstoichiometric Complexes in Low-Polarity Solvents. Macromolecules 1996. [DOI: 10.1021/ma9511311] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | | | | | | | | | | | - William J. MacKnight
- Department of Polymer Science and Engineering, University of Massachusetts, Amherst, Massachusetts 01003
| |
Collapse
|
33
|
Huynh NH, Karlsson A, Pettersson C. Enantiomeric separation of basic drugs using N-benzyloxycarbonylglyclyl-L-proline as counter ion in methanol. J Chromatogr A 1995; 705:275-87. [PMID: 7640770 DOI: 10.1016/0021-9673(95)00302-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Direct separation of enantiomeric amines using mainly N-benzyloxycarbonylglycyl-L-proline (L-ZGP) but also N-benzyloxycarbonylglyclglcyl-L-proline (L-ZGGP) as the chiral counter ion in methanol is described. The solid phase was Hypercarb porous graphitic carbon. Several amines of pharmacological interest (e.g., alprenolol, sotalol, terbutaline, promethazine and trimipramine) were separated with high enantioselectivity (alpha = 1.16-1.98) using L-ZGP and L-ZGGP as chiral selectors. In accordance with ion-pair chromatography, the retention of the enantiomeric amines was found to increase with increasing concentration of the anionic form of L-ZGP. Addition of a base (sodium hydroxide or an alkylamine) in excess of L-ZGP gave rise to a decrease in retention and enantioselectivity. The enantioselective retention was also affected by adding 2-propanol or acetonitrile to the mobile phase.
Collapse
Affiliation(s)
- N H Huynh
- Uppsala University, Biomedical Centre, Sweden
| | | | | |
Collapse
|
34
|
Halling PJ, Han Y, Johnston GA, Suckling CJ, Valivety RH. Behaviour of hydrophobic pH indicators in aqueous–organic two-phase systems. ACTA ACUST UNITED AC 1995. [DOI: 10.1039/p29950000911] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
35
|
|
36
|
Schneider HJ. Mechanismen der molekularen Erkennung - Untersuchungen an organischen Wirt-Gast-Komplexen. Angew Chem Int Ed Engl 1991. [DOI: 10.1002/ange.19911031104] [Citation(s) in RCA: 97] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
37
|
Hála J, Smola J. Solvent extraction of tetraphenylarsonium ion pairs from mixed aqueous-organic solutions. J Radioanal Nucl Chem 1991. [DOI: 10.1007/bf02042144] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
38
|
Wrona PK, Krygowski TM, Galus Z. Correlations between empirical lewis acid-base solvent parameters and the thermodynamic parameters of ion solvation. Part II. Acidity parameters of cations and basicity parameters of anions. J PHYS ORG CHEM 1991. [DOI: 10.1002/poc.610040706] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
39
|
Chmurzyński L. Acid–base and cationic homoconjugation equilibria in nitromethane solutions of substituted pyridine N-oxide systems. ACTA ACUST UNITED AC 1991. [DOI: 10.1039/ft9918701729] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
40
|
Kusakabe S, Shinoda M, Kusafuka K. Ion Association of Tetrabutylammonium Halides in 1,1- and 1,2-Dichloroethane and 4-Methyl-2-pentanone. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1989. [DOI: 10.1246/bcsj.62.333] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
41
|
The standard redox potential in the study of solute—solvent interactions. Dirhodium complexes. Inorganica Chim Acta 1989. [DOI: 10.1016/s0020-1693(00)89277-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
42
|
Abstract
Nonradiative energy transfer between fluorescent labels attached to polymers has been used to characterize polymer miscibility, the interpenetration of chain molecules in solution, micelle formation in graft copolymers, the unfolding of collapsed chain molecules in polymer melts, and the transfer of energy absorbed by a large number of donor labels to a small number of acceptors by an "antenna effect." The change in the emission spectrum after ionomer solutions with different fluorescent counterions were mixed provided rate constants for counterion interchange. The fluorescence behavior of dispersions of donor-labeled polymers stabilized by a graft copolymer with acceptor fluorophores in the solution phase led to inferences about the morphology of the dispersed particles.
Collapse
|
43
|
Billing R, Rehorek D, Salvetter J, Hennig H. Photokatalytische Systeme. LXVIII. Second-Sphere-Photoreaktion von Cyanometallaten mit Diphenyliodoniumionen. Z Anorg Allg Chem 1988. [DOI: 10.1002/zaac.19885570125] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
44
|
Ossola F, Pistoia G, Seeber R, Ugo P. Oxidation potentials of electrolyte solutions for lithium cells. Electrochim Acta 1988. [DOI: 10.1016/0013-4686(88)80030-6] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
45
|
|
46
|
Hünig S, Reichelt H. Trimethylsilylcyanid als Umpolungsreagens, XI. Über den ambidenten Charakter substituierter Allyl-Anionen. ACTA ACUST UNITED AC 1986. [DOI: 10.1002/cber.19861190604] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
47
|
Selenium oxychloride as an effective chlorinating agent and solvent for vanadium(IV) complexes. An ESR study. Inorganica Chim Acta 1985. [DOI: 10.1016/s0020-1693(00)90735-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
48
|
Doolan PC, Gore PH, Short EL, Thomas PS, Waters DN. Interaction of tin (IV) chloride with sulfolane and between tin (IV) chloride and lithium chloride in sulfolane solution. J SOLUTION CHEM 1984. [DOI: 10.1007/bf00645704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
49
|
Barthel J, Gores HJ, Schmeer G, Wachter R. Non-aqueous electrolyte solutions in chemistry and modern technology. PHYSICAL AND INORGANIC CHEMISTRY 1983. [DOI: 10.1007/3-540-12065-3_2] [Citation(s) in RCA: 85] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
|
50
|
Balt S, Kuipers HJAM. Conductance of 1:1 cobalt(III) amine complex salts in liquid ammonia. J SOLUTION CHEM 1983. [DOI: 10.1007/bf00650712] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|