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Chabilan A, Ledesma DGB, Horn H, Borowska E. Mesocosm experiment to determine the contribution of adsorption, biodegradation, hydrolysis and photodegradation in the attenuation of antibiotics at the water sediment interface. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 866:161385. [PMID: 36621511 DOI: 10.1016/j.scitotenv.2022.161385] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 12/31/2022] [Accepted: 12/31/2022] [Indexed: 06/17/2023]
Abstract
To understand the fate of antibiotics in the aquatic environment, we need to evaluate to which extent the following processes contribute to the overall antibiotic attenuation: adsorption to river sediment, biodegradation, hydrolysis and photodegradation. A laboratory scale mesocosm experiment was conducted in 10 L reactors filled with river sediment and water. The reactors were spiked with four classes of antibiotics (fluoroquinolones, macrolides, sulfonamides, tetracyclines), as well as clindamycin and trimethoprim. The experimental-set-up was designed to study the attenuation processes in parallel in one mesocosm experiment, hence also considering synergetic effects. Our results showed that antibiotics belonging to the same class exhibited similar behavior. Adsorption was the main attenuation process for the fluoroquinolones and tetracyclines (44.4 to 80.0 %). For the sulfonamides, biodegradation was the most frequent process (50.2 to 65.1 %). Hydrolysis appeared to be significant only for tetracyclines (12.6 to 41.8 %). Photodegradation through visible light played a minor role for most of the antibiotics - fluoroquinolones, sulfonamides, and trimethoprim (0.7 to 24.7 %). The macrolides were the only class of antibiotics not affected by the studied processes and they persisted in the water phase. Based on our results, we propose to class the antibiotics in three groups according to their persistence in the water phase. Fluoroquinolones and tetracyclines were non-persistent (half-lives shorter than 11 d). Chlorotetracycline, sulfapyridine and trimethoprim showed a moderate persistence (half-lives between 12 and 35 d). Due to half-lives longer than 36 d sulfonamides and clindamycin were classified as persistent.
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Affiliation(s)
- Amélie Chabilan
- Karlsruhe Institute of Technology, Engler-Bunte-Institut, Water Chemistry and Water Technology, Engler-Bunte-Ring 9, 76131 Karlsruhe, Germany
| | - Daniel Gustavo Barajas Ledesma
- Karlsruhe Institute of Technology, Engler-Bunte-Institut, Water Chemistry and Water Technology, Engler-Bunte-Ring 9, 76131 Karlsruhe, Germany
| | - Harald Horn
- Karlsruhe Institute of Technology, Engler-Bunte-Institut, Water Chemistry and Water Technology, Engler-Bunte-Ring 9, 76131 Karlsruhe, Germany; DVGW-Research Center at the Engler-Bunte-Institut, Water Chemistry and Water Technology, Karlsruhe Institute of Technology, Engler-Bunte-Ring 9, 76131 Karlsruhe, Germany.
| | - Ewa Borowska
- Karlsruhe Institute of Technology, Engler-Bunte-Institut, Water Chemistry and Water Technology, Engler-Bunte-Ring 9, 76131 Karlsruhe, Germany
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Patil SA, Budri MB, Inamdar SR, Gudasi KB. Effect of Hydroxyl Group on Photo-Physical Properties and Dipole Moments of Fluorescent Dyes: An Experimental and Computational Approach. J Fluoresc 2022; 33:1041-1056. [PMID: 36565412 DOI: 10.1007/s10895-022-03105-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Accepted: 11/28/2022] [Indexed: 12/25/2022]
Abstract
In this work, structurally similar, (E)-N'-(2-hydroxybenzylidene)-3,5-di-tert-butyl-2-hydroxybenzohydrazide (A) and (E)-N'-(2-4-dihydroxybenzylidene)-3,5-di-tert-butyl-2-hydroxybenzohydrazide (A-OH) dyes dissolved in general solvents have been studied to explore photo-physical properties, employing solvatochromic shift method, thereby determining their dipole moments in the ground (μg) and excited (μe) states. The molecule A shows a bathochromic shift of fluorescence emission maxima in aprotic solvents whereas a hypsochromic shift in protic solvents. Interestingly, A-OH follows a hypsochromic shift in both protic and aprotic solvents with increasing solvent polarity. The effect of hydroxyl substituent on UV-Visible absorption, fluorescence emission, and dipole moment of the titled organic molecules was explained. Theoretical methods such as Bilot-Kawski method for determination of μg and μe and Bakshiev, Kawski-Chamma-Viallet, Lippert-Mataga equations for μe, and Reichardt method for the difference between μg and μe were employed. It is observed that μe is higher than that of μg for both the molecules, and interestingly, upon substituting an additional hydroxyl group the value of μg has increased while μe is decreased. The DFT calculations have been performed to support experimental results by employing DFT/B3LYP/6-311G + (d) and TD-DFT/B3LYP/6-311G + (d) method using Gaussian09 software. The electrophilic and nucleophilic sites on the molecules were studied with the help of MEP. The NBO analysis results show that the interaction N24 (σ) → C22-O23 (π*) is found to be stronger in both the molecules with energy 68.90 kJ/mol and the effect of hydroxyl group is also discussed on the basis of HOMO and LUMO.
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Affiliation(s)
- Shivaraj A Patil
- Laser Spectroscopy (DRDO/KU) Programme, Department of Physics, Karnatak University, Dharwad, 580003, India
| | - Mahantesh B Budri
- Department of Chemistry, Karnatak University, Dharwad, 580003, India
| | - Sanjeev R Inamdar
- Laser Spectroscopy (DRDO/KU) Programme, Department of Physics, Karnatak University, Dharwad, 580003, India.
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Berrekhchi-Berrahma AC, Springborg M, Zhou M, Haddou A, Rahal MS. Efficient model photosensitizers based on metallocenyl complexes with thiophene-N = N-pyrimidine as π-conjugated bridge and cyanoacrylate as an anchoring group: a density functional theory study. J Mol Model 2022; 28:213. [PMID: 35799032 DOI: 10.1007/s00894-022-05208-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Accepted: 06/26/2022] [Indexed: 11/28/2022]
Abstract
Eight push-pull systems involving containing four transition metals (iron, ruthenium, cobalt, and nickel), metallocenes as donor groups, cyanoacrylate as electron attractor group, and thiophene-N = N- pyrimidine derivatives as π-conjugated bridges were designed and studied using DFT and TD-DFT methods involving B3LYP and CAM-B3LYP functionals combined with the cc-pVDZ/LANL2DZ basis sets. The main purpose of this work is to determine the effect of metallocene in improving the photosensitization property of such chromophores. This was done by calculating their light-harvesting efficiency LHE as well as other properties employed for DSSC application. The considered dyes were first studied in the gas phase, then in the presence of TiO2 nanoparticles representing the semi-conductor, and finally in the presence of a specific implicit solvent. The presence of iron as metal involved in the metallocene group supplemented by extending the π-conjugated bridge by a cyanovinyl spacer was demonstrated so as to give the most optimal response taking into account the lower cost and toxicity as well as the friendliness to the environment of iron as metal.
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Affiliation(s)
- Amina C Berrekhchi-Berrahma
- Laboratoire de Chimie Théorique de Bio-Et Nanosystèmes (LCTBN), Faculty of Exact Sciences, University Djillali Liabes of Sidi Bel Abbès, Sidi Bel Abbès, Algeria
| | - Michael Springborg
- Physikalische Und Theoretische Chemie, Universitaet Des Saarlandes, Campus, Geb. B2.2, Saarbrücken, Germany
| | - Meijuan Zhou
- Physikalische Und Theoretische Chemie, Universitaet Des Saarlandes, Campus, Geb. B2.2, Saarbrücken, Germany
| | - Abdelghani Haddou
- Laboratoire de Chimie Théorique de Bio-Et Nanosystèmes (LCTBN), Faculty of Exact Sciences, University Djillali Liabes of Sidi Bel Abbès, Sidi Bel Abbès, Algeria
| | - Majda Sekkal Rahal
- Laboratoire de Chimie Théorique de Bio-Et Nanosystèmes (LCTBN), Faculty of Exact Sciences, University Djillali Liabes of Sidi Bel Abbès, Sidi Bel Abbès, Algeria.
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Karimova NV, Luo M, Grassian VH, Gerber RB. Absorption spectra of benzoic acid in water at different pH and in the presence of salts: insights from the integration of experimental data and theoretical cluster models. Phys Chem Chem Phys 2020; 22:5046-5056. [PMID: 32077456 DOI: 10.1039/c9cp06728k] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The absorption spectra of molecular organic chromophores in aqueous media are of considerable importance in environmental chemistry. In this work, the UV-vis spectra of benzoic acid (BA), the simplest aromatic carboxylic acid, in aqueous solutions at varying pH and in the presence of salts are measured experimentally. The solutions of different pH provide insights into the contributions from both the non-dissociated acid molecule and the deprotonated anionic species. The microscopic interpretation of these spectra is then provided by quantum chemical calculations for small cluster models of benzoic species (benzoic acid and benzoate anion) with water molecules. Calculations of the UV-vis absorbance spectra are then carried out for different clusters such as C6H5COOH·(H2O)n and C6H5COO-·(H2O)n, where n = 0-8. The following main conclusions from these calculations and the comparison to experimental results can be made: (i) the small water cluster yields good quantitative agreement with observed solution experiments; (ii) the main peak position is found to be very similar at different levels of theory and is in excellent agreement with the experimental value, however, a weaker feature about 1 eV to lower energy (red shift) of the main peak is correctly reproduced only by using high level of theory, such as Algebraic Diagrammatic Construction (ADC); (iii) dissociation of the BA into ions is found to occur with a minimum of water molecules of n = 8; (iv) the deprotonation of BA has an influence on the computed spectrum and the energetics of the lowest energy electronic transitions; (v) the effect of the water on the spectra is much larger for the deprotonated species than for the non-dissociated acid. It was found that to reproduce experimental spectrum at pH 8.0, additional continuum representation for the extended solvent environment must be included in combination with explicit solvent molecules (n ≥ 3); (vi) salts (NaCl and CaCl2) have minimal effect on the absorption spectrum and; (vii) experimental results showed that B-band of neutral BA is not sensitive to the solvent effects whereas the effect of the water on the C-band is significant. The water effects blue-shift this band up to ∼0.2 eV. Overall, the results demonstrate the ability to further our understanding of the microscopic interpretation of the electronic structure and absorption spectra of BA in aqueous media through calculations restricted to small cluster models.
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Affiliation(s)
- Natalia V Karimova
- Department of Chemistry, University of California, Irvine, CA 92697, USA
| | - Man Luo
- Department of Chemistry and Biochemistry, University of California, San Diego, CA 92093, USA
| | - Vicki H Grassian
- Department of Chemistry and Biochemistry, University of California, San Diego, CA 92093, USA and Department of Nanoengineering and Scripps Institution of Oceanography, University of California, San Diego, CA 92093, USA
| | - R Benny Gerber
- Department of Chemistry, University of California, Irvine, CA 92697, USA and Institute of Chemistry and Fritz Haber Research Center, Hebrew University of Jerusalem, Jerusalem 91904, Israel.
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Castro GT, Filippa MA, Peralta CM, Davin MV, Almandoz MC, Gasull EI. Solubility and Preferential Solvation of Piroxicam in Neat Solvents and Binary Systems. ACTA ACUST UNITED AC 2017. [DOI: 10.1515/zpch-2017-0946] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The solubilization and solvatochromic behavior of piroxicam (PRX) were analyzed using UV-vis spectroscopy in neat (protic and aprotic) and binary solvent mixtures. The effects of solvent dipolarity/polarizability and solvent–solute hydrogen bonding interactions on the absorption maxima were evaluated by means of the linear solvation energy relationship concept of Kamlet and Taft. This analysis indicated that both interactions play an important role in the position of the absorption maxima in neat solvents. While, the PRX solubility depends on the solute–solvent specific interactions, polarizability and the cohesive forces of the solvent, manifested mainly by means of the Hildebrand’s solubility parameter. Preferential solvation (PS) was studied in 10 binary mixtures. A non-ideal behavior of the wavenumber curve as the function of analytical mole fraction of co-solvent was detected. Index of preferential solvation, as well as the influence of solvent parameters were calculated. The process of dissolution was analyzed in aqueous binary mixtures of ethanol, ethylene glycol and propylene glycol. They were not spontaneous in all proportions, but when water concentration decreases in the mixtures, the process becomes more spontaneous.
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Affiliation(s)
- Gabriela Tatiana Castro
- Project PROICO 2-1614, Facultad de Química, Bioquímica y Farmacia, Universidad Nacional de San Luis , Chacabuco 917, D5700HHW , San Luis , Argentina
| | - Mauricio Andrés Filippa
- Project PROICO 2-1614, Facultad de Química, Bioquímica y Farmacia, Universidad Nacional de San Luis , Chacabuco 917, D5700HHW , San Luis , Argentina
| | - Cecilia Mariana Peralta
- Project PROICO 2-1614, Facultad de Química, Bioquímica y Farmacia, Universidad Nacional de San Luis , Chacabuco 917, D5700HHW , San Luis , Argentina
| | - María Virginia Davin
- Project PROICO 2-1614, Facultad de Química, Bioquímica y Farmacia, Universidad Nacional de San Luis , Chacabuco 917, D5700HHW , San Luis , Argentina
| | - María Cristina Almandoz
- Project PROICO 2-1614, Facultad de Química, Bioquímica y Farmacia, Universidad Nacional de San Luis , Chacabuco 917, D5700HHW , San Luis , Argentina
| | - Estela Isabel Gasull
- Project PROICO 2-1614, Facultad de Química, Bioquímica y Farmacia, Universidad Nacional de San Luis , Chacabuco 917, D5700HHW , San Luis , Argentina
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Elhorri A, Zouaoui-Rabah M. NLO response of derivatives of benzene, stilbene and diphenylacetylene: MP2 and DFT calculations. Chin J Chem Eng 2017. [DOI: 10.1016/j.cjche.2016.09.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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7
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Homocianu M, Airinei A. Intra-/inter-molecular interactions – Identification and evaluation by optical spectral data in solution. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2016.11.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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Ling C, Li X, Zhang Z, Liu F, Deng Y, Zhang X, Li A, He L, Xing B. High Adsorption of Sulfamethoxazole by an Amine-Modified Polystyrene-Divinylbenzene Resin and Its Mechanistic Insight. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:10015-23. [PMID: 27574832 DOI: 10.1021/acs.est.6b02846] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Sulfamethoxazole (SMZ) adsorption by a series of amine-modified polystyrene-divinylbenzene resins (PSA/B/C/D) was investigated. All resins showed a similar pH dependent adsorption of SMZ but their capacities were linearly related with the contents of primary amines (-NH2) rather than secondary amines (-NH-). Mechanisms of SMZ adsorption by PSA (highest -NH2 content) were discussed as an example. Due to comparable pKa, H-bonding interactions of -NH2(0) with SMZ(0) (regular H-bond) and SMZ(-) (negative charge-assisted H-bond, (-)CAHB) successively contributed most adsorption (pH 4-9). At weakly acidic pH, -NH2(0) was partially protonated and electrostatic attraction between -NH3(+) and SMZ(-) occurred concurrently, but could be hindered by increased loading of SMZ(0). Hydrophobic/ π-π interactions were not major mechanisms as phenanthrene and nitrobenzenes had little effect on SMZ adsorption. At alkaline pH, where SMZ(-) and -NH2(0) prevailed, adsorption was accompanied by the stoichiometric (∼1.0) proton exchange with water, leading to OH(-) release and the formation of (-)CAHB [SO2N(-)···H···NH2]. The interaction and SMZ spatial distribution in the resin-phase were further confirmed by FTIR and Raman spectra. SMZ was uniformly adsorbed on external and interior surfaces. SMZ adsorption by PSA had low-interference from other coexistent matter, but high stability after multiple regenerations. The findings will guide new adsorbent designs for selectively removing target organics.
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Affiliation(s)
- Chen Ling
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University , Nanjing 210023, P. R. China
- Stockbridge School of Agriculture, University of Massachusetts , Amherst, Massachusetts 01003, United States
| | - Xiaoyun Li
- Stockbridge School of Agriculture, University of Massachusetts , Amherst, Massachusetts 01003, United States
- College of Tourism and Environment, Shaanxi Normal University , Xi'an, Shaanxi 710119, P. R. China
| | - Zhiyun Zhang
- Department of Food Science, University of Massachusetts , Amherst, Massachusetts 01003, United States
| | - Fuqiang Liu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University , Nanjing 210023, P. R. China
| | - Yingqing Deng
- Stockbridge School of Agriculture, University of Massachusetts , Amherst, Massachusetts 01003, United States
| | - Xiaopeng Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University , Nanjing 210023, P. R. China
| | - Aimin Li
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University , Nanjing 210023, P. R. China
| | - Lili He
- Department of Food Science, University of Massachusetts , Amherst, Massachusetts 01003, United States
| | - Baoshan Xing
- Stockbridge School of Agriculture, University of Massachusetts , Amherst, Massachusetts 01003, United States
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Sirikun W, Chatchawalsaisin J, Sutanthavibul N. Solid-State Characterization and Interconversion of Recrystallized Amodiaquine Dihydrochloride in Aliphatic Monohydric Alcohols. AAPS PharmSciTech 2016. [PMID: 26206402 DOI: 10.1208/s12249-015-0355-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Amodiaquine dihydrochloride monohydrate (AQ-DM) was obtained by recrystallizing amodiaquine dihydrochloride dihydrate (AQ-DD) in methanol, ethanol, and n-propanol. Solid-state characterization of AQ-DD and AQ-DM was performed using X-ray powder diffractometry, Fourier transform infrared spectroscopy, thermogravimetry, and differential scanning calorimetry. All recrystallized samples were identified as AQ-DM. Crystal habits of AQ-DD and AQ-DM were shown to be needle-like and rhombohedral crystals, respectively. When AQ-DD and AQ-DM were exposed to various relative humidity in dynamic vapor sorption apparatus, no solid-state interconversion was observed. However, AQ-DM showed higher solubility than AQ-DD when exposed to bulk water during solubility study, while excess AQ-DM was directly transformed back to a more stable AQ-DD structure. Heating AQ-DM sample to temperatures ≥190°C induced initial change to metastable amorphous form (AQ-DA) which was rapidly recrystallized to AQ-DD upon ≥80%RH moisture exposure. AQ-DD was able to be recrystallized in alcohols (C1-C3) as AQ-DM solid-state structure. In summary, AQ-DM was shown to have different solubility, moisture and temperature stability, and interconversion pathways when compared to AQ-DD. Thus, when AQ-DM was selected for any pharmaceutical applications, these critical transformation and property differences should be observed and closely monitored.
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Duereh A, Sato Y, Smith RL, Inomata H. Spectroscopic Analysis of Binary Mixed-Solvent-Polyimide Precursor Systems with the Preferential Solvation Model for Determining Solute-Centric Kamlet–Taft Solvatochromic Parameters. J Phys Chem B 2015; 119:14738-49. [DOI: 10.1021/acs.jpcb.5b07751] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alif Duereh
- Graduate
School of Engineering and ‡Graduate School of Environmental
Studies, Research Center of Supercritical Fluid Technology, Tohoku University, Aramaki Aza Aoba 6-6-11, Aoba-ku, Sendai 980-8579, Japan
| | - Yoshiyuki Sato
- Graduate
School of Engineering and ‡Graduate School of Environmental
Studies, Research Center of Supercritical Fluid Technology, Tohoku University, Aramaki Aza Aoba 6-6-11, Aoba-ku, Sendai 980-8579, Japan
| | - Richard Lee Smith
- Graduate
School of Engineering and ‡Graduate School of Environmental
Studies, Research Center of Supercritical Fluid Technology, Tohoku University, Aramaki Aza Aoba 6-6-11, Aoba-ku, Sendai 980-8579, Japan
| | - Hiroshi Inomata
- Graduate
School of Engineering and ‡Graduate School of Environmental
Studies, Research Center of Supercritical Fluid Technology, Tohoku University, Aramaki Aza Aoba 6-6-11, Aoba-ku, Sendai 980-8579, Japan
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Das D, Sahu N, Roy S, Dutta P, Mondal S, Torres EL, Sinha C. The crystal structure of sulfamethoxazole, interaction with DNA, DFT calculation, and molecular docking studies. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 137:560-568. [PMID: 25240147 DOI: 10.1016/j.saa.2014.08.034] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Revised: 07/14/2014] [Accepted: 08/21/2014] [Indexed: 06/03/2023]
Abstract
Sulfamethoxazole (SMX) [4-amino-N-(5-methyl-1,2-oxazol-3-yl)benzenesulfonamide] is structurally established by single crystal X-ray diffraction measurement. The crystal packing shows H-bonded 2D polymer through N(7)-H(7A)-O(2), N(7)-H(7B)-O(3), N(1)-H(1)-N(2), C(5)-H(5)-O(3)-S(1) and N(7)-(H7A)-O(2)-S(1). Density Functional Theory (DFT) and Time Dependent-DFT (TD-DFT) computations of optimized structure of SMX determine the electronic structure and has explained the electronic spectral transitions. The interaction of SMX with CT-DNA has been studied by absorption spectroscopy and the binding constant (Kb) is 4.37×10(4)M(-1). The in silico test of SMX with DHPS from Escherichia coli and Streptococcus pneumoniae helps to understand drug metabolism and accounts the drug-molecule interactions. The molecular docking of SMX-DNA also helps to predict the interaction feature.
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Affiliation(s)
- Dipankar Das
- Department of Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata 700032, India
| | - Nilima Sahu
- Department of Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata 700032, India
| | - Suman Roy
- Department of Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata 700032, India
| | - Paramita Dutta
- Department of Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata 700032, India
| | - Sudipa Mondal
- Department of Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata 700032, India
| | - Elena L Torres
- Departamento de Química Inorgánica, c) Francisco Tomás y Valiente, 7, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Chittaranjan Sinha
- Department of Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata 700032, India.
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Dorneanu PP, Homocianu M, Tigoianu IR, Airinei A, Zaltariov M, Cazacu M. Solvent effects on the photophysical properties of poly[1,4-dihydroxyanthraquinoneimine-1,3-bis(phenylene-ester-methylene)tetramethyldisiloxane]. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 134:218-224. [PMID: 25014644 DOI: 10.1016/j.saa.2014.06.104] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 06/04/2014] [Accepted: 06/16/2014] [Indexed: 06/03/2023]
Abstract
Absorption and fluorescence spectra of a polyquinoneimine, PQI, built on 1,4-dihydroxyanthraquinone and a siloxane diamine, 1,3-bis(amino-phenylene-ester-methylene)tetramethyldisiloxane, have been investigated in solvents of different polarities. The effect of solvents on the spectral properties was investigated using Lippert-Mataga and Bakhshiev polarity functions and Catalán's multiple linear regression approach. Absorption and fluorescence spectra in studied solvents exhibit hypsochromic and bathochromic shifts, respectively. The polarity of the solvent was the main parameter which changes the spectral properties of PQI. Also, the binary mixtures of chloroform with methanol and dimethyl sulfoxide were used to analyze the intermolecular interactions and preferential solvation. The preferential solvation parameters (local mole fraction (X₂(L)), excess function (δs₂) and preferential solvation constant (KPS)) were calculated from spectral data and discussed as a function of cosolvent content. The values of quantum yield, decreased linearly with increasing solvent polarity (for non-polar and polar solvents).
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Affiliation(s)
| | - Mihaela Homocianu
- "Petru Poni" Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, 41A, Iaşi 700487, Romania.
| | - Ionut Radu Tigoianu
- "Petru Poni" Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, 41A, Iaşi 700487, Romania
| | - Anton Airinei
- "Petru Poni" Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, 41A, Iaşi 700487, Romania
| | - Mirela Zaltariov
- "Petru Poni" Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, 41A, Iaşi 700487, Romania
| | - Maria Cazacu
- "Petru Poni" Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, 41A, Iaşi 700487, Romania
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Almandoz MC, Sancho MI, Duchowicz PR, Blanco SE. UV-Vis spectroscopic study and DFT calculation on the solvent effect of trimethoprim in neat solvents and aqueous mixtures. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 129:52-60. [PMID: 24721283 DOI: 10.1016/j.saa.2014.02.191] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 02/21/2014] [Accepted: 02/25/2014] [Indexed: 06/03/2023]
Abstract
The solvatochromic behavior of trimethoprim (TMP) was analyzed using UV-Vis spectroscopy and DFT methods in neat and binary aqueous solvent mixtures. The effects of solvent dipolarity/polarizability and solvent-solute hydrogen bonding interactions on the absorption maxima were evaluated by means of the linear solvation energy relationship concept of Kamlet and Taft. This analysis indicated that both interactions play an important role in the position of the absorption maxima in neat solvents. The simulated absorption spectra of TMP and TMP:(solvent)n complexes in ACN and H2O using TD-DFT methods were in agreement with the experimental ones. Binary aqueous mixtures containing as co-solvents DMSO, ACN and EtOH were studied. Preferential solvation was detected as a nonideal behavior of the wavenumber curve respective to the analytical mole fraction of co-solvent in all binary systems. TMP molecules were preferentially solvated by the organic solvent over the whole composition range. Index of preferential solvation, as well as the influence of solvent parameters were calculated as a function of solvent composition.
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Affiliation(s)
- M C Almandoz
- Área de Química Física, Facultad de Química Bioquímica y Farmacia, Instituto Multidisciplinario de Investigaciones Biológicas (IMIBIO-SL) CONICET, Universidad Nacional de San Luis, 5700 San Luis, Argentina.
| | - M I Sancho
- Área de Química Física, Facultad de Química Bioquímica y Farmacia, Instituto Multidisciplinario de Investigaciones Biológicas (IMIBIO-SL) CONICET, Universidad Nacional de San Luis, 5700 San Luis, Argentina
| | - P R Duchowicz
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas INIFTA (UNLP, CCT La Plata-CONICET), Diag. 113 y 64, Sucursal 4, C.C. 16, 1900 La Plata, Argentina
| | - S E Blanco
- Área de Química Física, Facultad de Química Bioquímica y Farmacia, Instituto Multidisciplinario de Investigaciones Biológicas (IMIBIO-SL) CONICET, Universidad Nacional de San Luis, 5700 San Luis, Argentina
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