1
|
Polaczek J, Kieca K, Oszajca M, Impert O, Katafias A, Chatterjee D, Ćoćić D, Puchta R, Stochel G, Hubbard CD, van Eldik R. A Personal Account on Inorganic Reaction Mechanisms. CHEM REC 2023:e202300278. [PMID: 37821418 DOI: 10.1002/tcr.202300278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 09/22/2023] [Indexed: 10/13/2023]
Abstract
The presented Review is focused on the latest research in the field of inorganic chemistry performed by the van Eldik group and his collaborators. The first part of the manuscript concentrates on the interaction of nitric oxide and its derivatives with biologically important compounds. We summarized mechanistic information on the interaction between model porphyrin systems (microperoxidase) and NO as well as the recent studies on the formation of nitrosylcobalamin (CblNO). The following sections cover the characterization of the Ru(II)/Ru(III) mixed-valence ion-pair complexes, including Ru(II)/Ru(III)(edta) complexes. The last part concerns the latest mechanistic information on the DFT techniques applications. Each section presents the most important results with the mechanistic interpretations.
Collapse
Affiliation(s)
- Justyna Polaczek
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387, Kraków, Poland
| | - Konrad Kieca
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387, Kraków, Poland
- Jagiellonian University, Doctoral School of Exact and Natural Sciences, Kraków, 30-348, Krakow, Poland
| | - Maria Oszajca
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387, Kraków, Poland
| | - Olga Impert
- Faculty of Chemistry, Nicolaus Copernicus University in Torun, Gagarina 7, 87-100, Torun, Poland
| | - Anna Katafias
- Faculty of Chemistry, Nicolaus Copernicus University in Torun, Gagarina 7, 87-100, Torun, Poland
| | - Debabrata Chatterjee
- Faculty of Chemistry, Nicolaus Copernicus University in Torun, Gagarina 7, 87-100, Torun, Poland
- Vice-Chancellor's Research Group, Zoology Department, University of Burdwan, Burdwan, 713104, India
| | - Dušan Ćoćić
- University of Kragujevac, Faculty of Science, Department of Chemistry, Radoja Domanovića 12, P. O. Box 60, 34000, Kragujevac, Serbia
| | - Ralph Puchta
- Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Egerlandstrasse 1, 91058, Erlangen, Germany
- Central Institute for Scientific Computing (CISC), University of Erlangen-Nuremberg, Martensstr. 5a, 91058, Erlangen, Germany
- Computer Chemistry Center, Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Nägelsbachstr. 25, 91052, Erlangen, Germany
| | - Grażyna Stochel
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387, Kraków, Poland
| | - Colin D Hubbard
- Department of Chemistry, University of New Hampshire, Durham, 03824, USA
| | - Rudi van Eldik
- Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Egerlandstrasse 1, 91058, Erlangen, Germany
- Faculty of Chemistry, Nicolaus Copernicus University in Torun, Gagarina 7, 87-100, Torun, Poland
| |
Collapse
|
2
|
Electrochemistry of Ru(edta) complexes relevant to small molecule transformations: Catalytic implications and challenges. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.213773] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
|
3
|
Carné-Sánchez A, Carmona FJ, Kim C, Furukawa S. Porous materials as carriers of gasotransmitters towards gas biology and therapeutic applications. Chem Commun (Camb) 2020; 56:9750-9766. [DOI: 10.1039/d0cc03740k] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
This review highlights the strategies employed to load and release gasotransmitters such as NO, CO and H2S from different kinds of porous materials, including zeolites, mesoporous silica, metal–organic frameworks and protein assemblies.
Collapse
Affiliation(s)
- Arnau Carné-Sánchez
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS)
- Kyoto University
- Kyoto
- Japan
- Catalan Institute of Nanoscience and Nanotechnology (ICN2)
| | - Francisco J. Carmona
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS)
- Kyoto University
- Kyoto
- Japan
| | - Chiwon Kim
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS)
- Kyoto University
- Kyoto
- Japan
- Department of Synthetic Chemistry and Biological Chemistry
| | - Shuhei Furukawa
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS)
- Kyoto University
- Kyoto
- Japan
- Department of Synthetic Chemistry and Biological Chemistry
| |
Collapse
|
4
|
Marvasi M. Potential use and perspectives of nitric oxide donors in agriculture. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2017; 97:1065-1072. [PMID: 27786356 DOI: 10.1002/jsfa.8117] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Revised: 08/03/2016] [Accepted: 10/25/2016] [Indexed: 06/06/2023]
Abstract
Nitric oxide (NO) has emerged in the last 30 years as a key molecule involved in many physiological processes in plants, animals and bacteria. Current research has shown that NO can be delivered via donor molecules. In such cases, the NO release rate is dependent on the chemical structure of the donor itself and on the chemical environment. Despite NO's powerful signaling effect in plants and animals, the application of NO donors in agriculture is currently not implemented and research remains mainly at the experimental level. Technological development in the field of NO donors is rapidly expanding in scope to include controlling seed germination, plant development, ripening and increasing shelf-life of produce. Potential applications in animal production have also been identified. This concise review focuses on the use of donors that have shown potential biotechnological applications in agriculture. Insights are provided into (i) the role of donors in plant production, (ii) the potential use of donors in animal production and (iii) future approaches to explore the use and applications of donors for the benefit of agriculture. © 2016 Society of Chemical Industry.
Collapse
Affiliation(s)
- Massimiliano Marvasi
- Department of Natural Sciences, Faculty of Science and Technology, Middlesex University, The Burroughs, London, NW4 4BT, UK
| |
Collapse
|
5
|
Roveda AC, de Fazio Aguiar H, Miranda KM, Tadini CC, Franco DW. Light-triggered and cysteine-mediated nitric oxide release from a biodegradable starch-based film. J Mater Chem B 2014; 2:7232-7242. [DOI: 10.1039/c4tb00996g] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
6
|
|
7
|
Abstract
Platforms able to storage, release or scavenge NO in a controlled and specific manner is interesting for biological applications. Among the possible matrices for these purposes, dendrimers are excellent candidates for that. These molecules have been used as drug delivery systems and exhibit interesting properties, like the possibility to perform chemical modifications on dendrimers surface, the capacity of storage high concentrations of compounds of interest in the same molecule and the ability to improve the solubility and the biocompatibility of the compounds bonded to it. This review emphasizes the recent progress in the development and in the biological applications of different NO-releasing dendrimers and the nitric oxide release pathways in these compounds.
Collapse
|
8
|
Tahri Z, Lepski R, Hsieh KY, Bendeif EE, Pillet S, Durand P, Woike T, Schaniel D. Properties of metastable linkage NO isomers in Na2[Fe(CN)5NO]·2H2O incorporated in mesopores of silica xerogels. Phys Chem Chem Phys 2012; 14:3775-81. [DOI: 10.1039/c2cp23607a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
|
9
|
Tfouni E, Truzzi DR, Tavares A, Gomes AJ, Figueiredo LE, Franco DW. Biological activity of ruthenium nitrosyl complexes. Nitric Oxide 2012; 26:38-53. [DOI: 10.1016/j.niox.2011.11.005] [Citation(s) in RCA: 133] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Revised: 11/29/2011] [Accepted: 11/30/2011] [Indexed: 12/20/2022]
|
10
|
Experimental chemotherapy in paracoccidioidomycosis using ruthenium NO donor. Mycopathologia 2011; 172:95-107. [PMID: 21437728 DOI: 10.1007/s11046-011-9416-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2010] [Accepted: 03/06/2011] [Indexed: 10/18/2022]
Abstract
Paracoccidioidomycosis (PCM) is a granulomatous disease caused by a dimorphic fungus, Paracoccidioides brasiliensis (Pb). To determine the influence of nitric oxide (NO) on this disease, we tested cis-[Ru(bpy)2(NO)SO3](PF6), ruthenium nitrosyl, which releases NO when activated by biological reducing agents, in BALB/c mice infected intravenously with Pb 18 isolate. In a previous study by our group, the fungicidal activity of ruthenium nitrosyl was evaluated in a mouse model of acute PCM, by measuring the immune cellular response (DTH), histopathological characteristics of the granulomatous lesions (and numbers), cytokines, and NO production. We found that cis-[Ru(bpy)2(NO)SO3](PF6)-treated mice were more resistant to infection, since they exhibited higher survival when compared with the control group. Furthermore, we observed a decreased influx of inflammatory cells in the lung and liver tissue of treated mice, possibly because of a minor reduction in fungal cell numbers. Moreover, an increased production of IL-10 and a decrease in TNF-α levels were detected in lung tissues of infected mice treated with cis-[Ru(bpy)2(NO)SO3](PF6). Immunohistochemistry showed that there was no difference in the number of VEGF- expressing cells. The animals treated with cis-[Ru(bpy)2(NO)SO3](PF6) showed high NO levels at 40 days after infection. These results show that NO is effectively involved in the mechanism that regulates the immune response in lung of Pb-infected mice. These data suggest that NO is a resistance factor during paracoccidioidomycosis by controlling fungal proliferation, influencing cytokine production, and consequently moderating the development of a strong inflammatory response.
Collapse
|
11
|
da Silva FO, Gomes EC, Francisco TDS, Holanda AK, Diógenes IC, de Sousa EH, Lopes LG, Longhinotti E. NO donors cis-[Ru(bpy)2(L)NO]3+ and [Fe(CN)4(L)NO]− complexes immobilized on modified mesoporous silica spheres. Polyhedron 2010. [DOI: 10.1016/j.poly.2010.09.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
12
|
|
13
|
Brondani D, Vieira IC, Piovezan C, Ramos da Silva JM, Neves A, Dupont J, Scheeren CW. Sensor for fisetin based on gold nanoparticles in ionic liquid and binuclear nickel complex immobilized in silica. Analyst 2010; 135:1015-22. [DOI: 10.1039/b925533h] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
|
14
|
Cestari AR, Vieira EFS, Vieira GS, da Costa LP, Tavares AMG, Loh W, Airoldi C. The removal of reactive dyes from aqueous solutions using chemically modified mesoporous silica in the presence of anionic surfactant-the temperature dependence and a thermodynamic multivariate analysis. JOURNAL OF HAZARDOUS MATERIALS 2009; 161:307-316. [PMID: 18471967 DOI: 10.1016/j.jhazmat.2008.03.091] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2008] [Revised: 03/19/2008] [Accepted: 03/20/2008] [Indexed: 05/26/2023]
Abstract
The three-parameter Sips adsorption model was successfully employed to modeled equilibrium adsorption data of a yellow and a red dye onto a mesoporous aminopropyl-silica, in the presence of the surfactant sodium dodecylbenzenesulfonate (DBS) from 25 to 55 degrees C. The results were evaluated in relation to the previously reported surface tension measurements. The presence of curvatures of the van()t Hoff plots suggested the presence of non-zero heat capacities terms (Delta(ads)C(p)). For the yellow dye, it is observed that the values of Delta(ads)H are almost all positive and they decrease in endothermicity, in the absence and in the presence of DBS, from 25 to 55 degrees C. For the red dye, there is an increase in endothermicity in relation to the temperature increase. The negative Delta(ads)G values indicate spontaneous adsorption processes. Almost all adsorption entropy values (Delta(ads)S) were positive. This suggests that entropy is a driving force of adsorption. The adsorption thermodynamic parameters were also evaluated using a new 2(3) full factorial design analysis. The multivariate polynomial modelings indicated that the thermodynamic parameters are also affected by important interactive effects of the experimental factors and not by the temperature changes alone.
Collapse
Affiliation(s)
- Antonio R Cestari
- Laboratory of Materials and Calorimetry, Departamento de Química/CCET, Universidade Federal de Sergipe, CEP 49100-000, São Cristóvão, Sergipe, Brazil.
| | | | | | | | | | | | | |
Collapse
|
15
|
Functionalization of PAMAM dendrimers with [RuIII(edta)(H2O)]−. Nitric Oxide 2008; 19:245-51. [DOI: 10.1016/j.niox.2008.04.027] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2007] [Revised: 03/27/2008] [Accepted: 04/29/2008] [Indexed: 11/21/2022]
|
16
|
Doro FG, Castellano EE, Moraes LAB, Eberlin MN, Tfouni E. Cyclam κ4 to κ3 Ligand Denticity Change Upon Mono-N-Substitution with a Carboxypropyl Pendant Arm in a Ruthenium Nitrosyl Complex. Inorg Chem 2008; 47:4118-25. [DOI: 10.1021/ic702078p] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Fábio G. Doro
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. dos Bandeirantes 3900, 14040-901 Ribeirão Preto, SP, Brazil, Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, Brazil, and Laboratório ThoMSon de Espectrometria de Massas, Instituto de Química, Universidade Estadual de Campinas UNICAMP, Campinas, Brazil
| | - Eduardo E. Castellano
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. dos Bandeirantes 3900, 14040-901 Ribeirão Preto, SP, Brazil, Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, Brazil, and Laboratório ThoMSon de Espectrometria de Massas, Instituto de Química, Universidade Estadual de Campinas UNICAMP, Campinas, Brazil
| | - Luiz A. B. Moraes
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. dos Bandeirantes 3900, 14040-901 Ribeirão Preto, SP, Brazil, Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, Brazil, and Laboratório ThoMSon de Espectrometria de Massas, Instituto de Química, Universidade Estadual de Campinas UNICAMP, Campinas, Brazil
| | - Marcos N. Eberlin
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. dos Bandeirantes 3900, 14040-901 Ribeirão Preto, SP, Brazil, Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, Brazil, and Laboratório ThoMSon de Espectrometria de Massas, Instituto de Química, Universidade Estadual de Campinas UNICAMP, Campinas, Brazil
| | - Elia Tfouni
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. dos Bandeirantes 3900, 14040-901 Ribeirão Preto, SP, Brazil, Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, Brazil, and Laboratório ThoMSon de Espectrometria de Massas, Instituto de Química, Universidade Estadual de Campinas UNICAMP, Campinas, Brazil
| |
Collapse
|
17
|
Gomes AJ, Barbougli PA, Espreafico EM, Tfouni E. trans-[Ru(NO)(NH3)4(py)](BF4)3·H2O encapsulated in PLGA microparticles for delivery of nitric oxide to B16-F10 cells: Cytotoxicity and phototoxicity. J Inorg Biochem 2008; 102:757-66. [DOI: 10.1016/j.jinorgbio.2007.11.012] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2007] [Revised: 11/25/2007] [Accepted: 11/27/2007] [Indexed: 10/22/2022]
|
18
|
Silva JJN, Osakabe AL, Pavanelli WR, Silva JS, Franco DW. In vitro and in vivo antiproliferative and trypanocidal activities of ruthenium NO donors. Br J Pharmacol 2007; 152:112-21. [PMID: 17603548 PMCID: PMC1978270 DOI: 10.1038/sj.bjp.0707363] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND AND PURPOSE Many compounds liberating NO (NO donors) have been used as therapeutic agents. Here we test two ruthenium nitrosyls, which release NO when activated by biological reducing agents, for their effects in vitro and in vivo against Trypanosoma cruzi, the agent responsible for the American trypanosomiasis (Chagas' disease). EXPERIMENTAL APPROACH Ruthenium NO donors were incubated with a partially drug-resistant strain of T. cruzi and the anti-proliferative and trypanocidal activities evaluated. In a mouse model of acute Chagas' disease, trypanocidal activity was evaluated by measuring parasitemia, survival rate of infected mice and elimination of amastigotes in myocardial tissue. KEY RESULTS In vitro, the observed anti-proliferative and trypanocidal activities of trans-[Ru(NO)(NH(3))(4)isn](BF(4))(3) and trans-[Ru(NO)(NH(3))(4)imN](BF(4))(3) were due to NO liberated upon reduction of these nitrosyls. Ru(NO)isn had a lower IC(50 epi) (67 microM) than the NO donor, sodium nitroprusside (IC(50 epi)=244 microM) and Ru(NO)imN (IC(50 try)=52 microM) was more potent than gentian violet (IC(50 try)=536 microM), currently used in the treatment of blood. Both ruthenium nitrosyls eliminated, in vivo, extracellular as well as intracellular forms of T. cruzi in the bloodstream and myocardial tissue and allowed survival of up to 80% of infected mice at a dose (100 nmol kg(-1) day(-1)) much lower than the optimal dose for benznidazole (385 micromol kg(-1) day(-1)). CONCLUSIONS AND IMPLICATIONS Our data strongly suggest that NO liberated is responsible for the anti-proliferative and trypanocidal activities of the ruthenium NO donors and that these compounds are promising leads for novel and effective anti-parasitic drugs.
Collapse
Affiliation(s)
- J J N Silva
- Departamento de Química e Física Molecular, Instituto de Química de São Carlos – Universidade de São Paulo (USP) São Carlos, SP, Brazil
| | - A L Osakabe
- Departamento de Bioquímica e Imunologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo (USP) Ribeirão Preto, SP, Brazil
| | - W R Pavanelli
- Departamento de Bioquímica e Imunologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo (USP) Ribeirão Preto, SP, Brazil
| | - J S Silva
- Departamento de Bioquímica e Imunologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo (USP) Ribeirão Preto, SP, Brazil
| | - D W Franco
- Departamento de Química e Física Molecular, Instituto de Química de São Carlos – Universidade de São Paulo (USP) São Carlos, SP, Brazil
- Author for correspondence:
| |
Collapse
|
19
|
Cestari AR, Vieira EFS, Vieira GS, Almeida LE. Aggregation and adsorption of reactive dyes in the presence of an anionic surfactant on mesoporous aminopropyl silica. J Colloid Interface Sci 2007; 309:402-11. [PMID: 17350647 DOI: 10.1016/j.jcis.2006.11.049] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2006] [Revised: 11/27/2006] [Accepted: 11/29/2006] [Indexed: 11/28/2022]
Abstract
A surface tension technique was used to determine the critical aggregation concentration (cac) of a yellow and a red dye in relation to the presence of the anionic surfactant sodium dodecylbenzene sulfonate (DBS) and to temperature changes in buffered aqueous solutions. The cac values of the yellow dye increase from 25 to 45 degrees C (from 41.37 to 50.32 mg L-1) and decrease from 45 to 55 degrees C (from 50.32 to 38.72 mg L-1). The cac values for the red dye/DBS aggregates decrease (from 124.52 to 88.50 mg L-1) from 25 to 55 degrees C. Adsorption of the two dyes onto a mesoporous aminopropyl silica (Sil-NH2) was also studied. The adsorption of the yellow dye increases with an increase in temperature from 25 to 55 degrees C. In the presence of DBS the adsorption on Sil-NH2 for the yellow dye decreases, and for the red dye increases from 25 to 55 degrees C. Adsorptions occurred below and above the cac of the anionic dyes/DBS aggregates. Adsorption of the dyes onto Sil-NH2 fitted well to the Langmuir, Freundlich, and Redlich-Peterson adsorption models. However, in the presence of DBS, only the Freundlich model fit the experimental adsorption data at low dye concentrations (less than 400 mg L-1). In this case, the Redlich-Peterson model was only fitted to the red dye adsorption data. The magnitude of the Dubinin-Radushkevich energetic parameters (E, from 7.00 to 15.00 kJ mol-1) indicates that the adsorption of the dyes onto Sil-NH2, in the absence and in the presence of DBS, is controlled by water adsorbed/dye in solution ion-exchange interactions. It is observed that the values of DeltaadsH are positive for both dyes and the values are quite similar to each other. The exception is the adsorption of the yellow dye in the presence of DBS, which is slightly exothermic. The DeltaadsG values are all negative. However, the interactions of the dyes with Sil-NH2 silica are more spontaneous in the presence of the surfactant. The positive adsorption entropy values (DeltaadsS) for the interaction of the dyes suggest that entropy is a driving force of the dye adsorptions. However, the entropic contribution is higher for the adsorptions in the presence of DBS. It was suggested that the chemical structures of the dyes play an important role in the formation of the dye/DBS aggregates and in dye adsorption onto the aminopropyl silica.
Collapse
Affiliation(s)
- Antonio R Cestari
- Laboratory of Materials and Calorimetry, Departamento de Química/CCET, Universidade Federal de Sergipe, CEP 49100-000, São Cristóvão, Sergipe, Brazil.
| | | | | | | |
Collapse
|
20
|
Doro FG, Rodrigues-Filho UP, Tfouni E. A regenerable ruthenium tetraammine nitrosyl complex immobilized on a modified silica gel surface: preparation and studies of nitric oxide release and nitrite-to-NO conversion. J Colloid Interface Sci 2006; 307:405-17. [PMID: 17196216 DOI: 10.1016/j.jcis.2006.11.013] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2006] [Revised: 11/09/2006] [Accepted: 11/09/2006] [Indexed: 11/27/2022]
Abstract
Silica gel bearing isonicotinamide groups was prepared by further modification of 3-aminopropyl-functionalized silica by a reaction with isonicotinic acid and 1,3-dicyclohexylcarbodiimide to yield 3-isonicotinamidepropyl-functionalized silica gel (ISNPS). This support was characterized by means of infrared spectroscopy, elemental analysis, and specific surface area. The ISNPS was used to immobilize the [Ru(NH(3))(4)SO(3)] moiety by reaction with trans-[Ru(NH(3))(4)(SO(2))Cl]Cl, yielding [Si(CH(2))(3)(isn)Ru(NH(3))(4)(SO(3))]. The related immobilized [Si(CH(2))(3)(isn)Ru(NH(3))(4)(L)](3+/2+) (L=SO(2), SO(2-)(4), OH(2), and NO) complexes were prepared and characterized by means of UV-vis and IR spectroscopy, as well as by cyclic voltammetry. Syntheses of the nitrosyl complex were performed by reaction of the immobilized ruthenium ammine [Si(CH(2))(3)(isn)Ru(NH(3))(4)(OH(2))](2+) with nitrite in acid or neutral (pH 7.4) solution. The similar results obtained in both ways indicate that the aqua complex was able to convert nitrite into coordinated nitrosyl. The reactivity of [Si(CH(2))(3)(isn)Ru(NH(3))(4)(NO)](3+) was investigated in order to evaluate the nitric oxide (NO) release. It was found that, upon light irradiation or chemical reduction, the immobilized nitrosyl complex was able to release NO, generating the corresponding Ru(III) or Ru(II) aqua complexes, respectively. The NO material could be regenerated from these NO-depleted materials obtained photochemically or by reduction. Regeneration was done by reaction with nitrite in aqueous solution (pH 7.4). Reduction-regeneration cycles were performed up to three times with no significant leaching of the ruthenium complex.
Collapse
Affiliation(s)
- Fabio Gorzoni Doro
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. dos Bandeirantes 3900, 14040-901 Ribeirão Preto, SP, Brazil
| | | | | |
Collapse
|