Alejandra Romero‐Morán

Benemérita Universidad Autónoma de Puebla

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Joel Molina‐Reyes

National Institute of Astrophysics, Optics and Electronics

José Luis Sánchez‐Salas

Universidad de las Américas Puebla

Hugo Vázquez‐Lima

Benemérita Universidad Autónoma de Puebla

Samuel Hernández‐Anzaldo

Benemérita Universidad Autónoma de Puebla

Yasmi Reyes‐Ortega

Benemérita Universidad Autónoma de Puebla

Arturo Ponce

The University of Texas at San Antonio

Eduardo Ortega

Fritz Haber Institute of the Max Planck Society

Héctor Uribe-Vargas

National Institute of Astrophysics, Optics and Electronics

J. Mateos

Universidad de Salamanca

Anaí Zavala-Franco

Instituto Politécnico Nacional

Cooperative Institutions

Benemérita Universidad Autónoma de Puebla

National Institute of Astrophysics, Optics and Electronics

Universidad Nacional Autónoma de México

Centre National de la Recherche Scientifique

Instituto Politécnico Nacional

Universidad de Salamanca

Universidad de las Américas Puebla

Institut d'électronique de microélectronique et de nanotechnologie

Universidad de Granada

Center for Research and Advanced Studies of the National Polytechnic Institute

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Synthesis and photocatalytic activity of titanium oxinitride Ti(O, N) and Pd-Ti(O,N) nanoparticles

HAL (Le Centre pour la Communication Scientifique Directe) (2016)

Nathalie Herlin-Boime Patrícia Simon Alejandra Romero‐Morán F. Dappozze C. Guillard

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Study on the photocatalytic activity of titanium dioxide nanostructures: Nanoparticles, nanotubes and ultra-thin films

Catalysis Today (2018)

Joel Molina‐Reyes Alejandra Romero‐Morán Héctor Uribe-Vargas Beatriz López Ruíz José Luis Sánchez‐Salas

Titanium Dioxide

10.1016/j.cattod.2018.05.033

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Citations (42)

Enhanced photocatalytic bacterial inactivation of atomic-layer deposited anatase-TiO2 thin films on rutile-TiO2 nanotubes

Photochemical & Photobiological Sciences (2020)

Joel Molina‐Reyes Alejandra Romero‐Morán José Luis Sánchez‐Salas

Rutile

Titanium Dioxide

10.1039/c9pp00348g

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Citations (7)

Investigating axial ligand impact on pinch-porphyrin peroxidase activity with [bis(o-methylpyridino) (dimethylesterprotoporphyrinato)Fe(III)] chloride

Journal of Porphyrins and Phthalocyanines (2023)

Alejandra Romero‐Morán Samuel Hernández‐Anzaldo Hugo Vázquez‐Lima Yasmi Reyes‐Ortega

The synthesis and characterization of a novel hexacoordinated compound as a product of the reaction between chlorodimethylesterprotoprphyrin–Fe(III) 1 and 2–methylpiridine (2–CH 3 Py) was performed. The [bis(o–methylpyridino)(dimethylesterprotoporphyrinato)Fe(III)] chloride 2 is a compound of the family of the pinch–porphyrins, a model of peroxidase enzymes. We analyzed 2 using UV-Vis, 1 H NMR, and EPR spectroscopies, as well as kinetic quantifications of its peroxidase activity and computational analysis, to evaluate the presence of the pinch-ligand coordinated to 1 in a series of pinch-ironprotoporphyrin complexes, as previously reported. Our investigation revealed that the oxidant activity of Compound I derived from peroxidase activity determination of 1 and 2, respectively, is better controlled when a heterohydrocarbonated chain is attached to the pyridyl groups that coordinate axially to 1; an effect evidenced by a decrease of the activation energy value associated with Compound 0 formation during the reaction performed by pinch–porphyrin, with the picdien axial ligand and hydrogen peroxide. When correlating the contribution of [Formula: see text]3/2 in the quantum mixed-spin state (qms), [Formula: see text]3/2, [Formula: see text]5/2, of iron(III)-based complexes with their peroxidase activity, we found that when the qms [Formula: see text]3/2, [Formula: see text]5/2, of iron(III) had 80% character [Formula: see text]3/2, the peroxide activity increased significantly. This could be a fundamental trait that could affect the peroxidase activity owing to the distortion of the iron geometry associated with its coordination number when o−methylpyridine is used as an axial ligand.

Proton NMR

10.1142/s1088424623501055

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Theoretical insights of ionization potential and electron affinity modulations on planar vs. ruffled iron(III) porphyrins

Journal of Porphyrins and Phthalocyanines (2025)

Luis Leon-Enriquez Alejandra Romero‐Morán Yasmi Reyes‐Ortega Samuel Hernández‐Anzaldo Hugo Vázquez‐Lima

Journal of Porphyrins and PhthalocyaninesAccepted Papers Free AccessTheoretical insights of ionization potential and electron affinity modulations on planar vs. ruffled iron(III) porphyrinsLuis Leon-Enriquez, Alejandra Romero-Moran, Yasmi Reyes-Ortega, Samuel Hernandez-Anzaldo, and Hugo Vazquez-LimaLuis Leon-Enriquez, Alejandra Romero-Moran Search for more papers by this author , Yasmi Reyes-Ortega Search for more papers by this author , Samuel Hernandez-Anzaldo Search for more papers by this author , and Hugo Vazquez-Lima Search for more papers by this author https://doi.org/10.1142/S1088424625500087Cited by:0 (Source: Crossref) PreviousNext AboutFiguresReferencesRelatedDetailsView articleSupplemental MaterialPDF/EPUB ToolsAdd to favoritesDownload CitationsTrack CitationsRecommend to Library ShareShare onFacebookTwitterLinked InRedditEmail Cite Recommend View articleSupplemental MaterialPDF/EPUB Most comprehensive & up-to-date research on PORPHYRINS Handbook of Porphyrin Science now available in 46 volumes We recommendElectrospray mass spectrometry of isomeric tetrakis(N-alkylpyridyl)porphyrins and their manganese(III) and iron(III) complexesJournal of Porphyrins and Phthalocyanines, 2012Comparative 1HNMR and UV-Visible Studies of Polyene Polymer Epoxidations Catalyzed by Iron(III), Manganese(III) and Chromium(III) PorphyrinsE. M. DAVORAS, Journal of Porphyrins and Phthalocyanines, 2012J- and H-Aggregates of Porphyrins with Surfactants: Fluorescence, Stopped Flow and Electron Microscopy StudiesNAKUL C. MAITI, Journal of Porphyrins and Phthalocyanines, 2012Bathochromically shifted absorption and near IR emission in bismuth(III) porphyrins with meso-fluorophenyl and methoxyphenyl substitutionsNoah Holzer, Journal of Porphyrins and Phthalocyanines, 2023Excited state electron transfer in A2 and A2B2 functionalized zinc porphyrins carrying rigid and flexible β-pyrrole π-extended substituentsMichael B. Thomas, Journal of Porphyrins and PhthalocyaninesApplication of Theory of ''Pathogen Invading Nutrient and Blood Aspects'' in Precancerous Lesions of Gastric Cancer Chinese Journal of Experimental Traditional Medical Formulae, 2023Effect of Tianhuang Formula on Renal Injury and Fibrosis in Hyperuricemia Mice MO Juxian, Chinese Journal of Experimental Traditional Medical Formulae, 2023Progress of Rhei Radix et Rhizoma and Its Combination in Treatment of Cerebral Hemorrhage: A Review QI Dahe, Chinese Journal of Experimental Traditional Medical Formulae, 2023Investigation of Metabolic Stability of Phase Ⅰ and Ⅱ Sulfation of Lucidin in Liver Microsomes and Liver S9 from Different Species MA Yuexin, Chinese Journal of Experimental Traditional Medical Formulae, 2022Clinical Effect of Mahuang Xixin Fuzitang Combined with Acupuncture and Moxibustion in Treatment of Localized Scleroderma Chinese Journal of Experimental Traditional Medical Formulae, 2022Powered by Privacy policyGoogle Analytics settings FiguresReferencesRelatedDetailsNone Recommended Recommended High-valent iron porphyrinsAVRAM GOLD and RAYMOND WEISSJournal of Porphyrins and PhthalocyaninesVol. 04, No. 04Electrospray mass spectrometry of isomeric tetrakis(N-alkylpyridyl)porphyrins and their manganese(III) and iron(III) complexesINES BATINIĆ-HABERLE, ROBERT D. STEVENS, and IRWIN FRIDOVICHJournal of Porphyrins and PhthalocyaninesVol. 04, No. 03Electroreductive dechlorination of α-hexachlorocyclohexane catalyzed by iron porphyrins in nonaqueous mediaWeihua Zhu, Cui Ni, Lili Liang, Junwen Li, Minzhi Li, Zhongping Ou, and Karl M. KadishJournal of Porphyrins and PhthalocyaninesVol. 18, No. 06Formation and characterization of five- and six-coordinate iron(III) corrolazine complexesSatoshi Kurahashi, Takahisa Ikeue, Tamotsu Sugimori, Masashi Takahashi, Masahiro Mikuriya, Makoto Handa, Akira Ikezaki, and Mikio NakamuraJournal of Porphyrins and PhthalocyaninesVol. 16, No. 05n06Synthesis, electrochemical and spectroelectrochemical characterization of iron(III) tetraarylporphyrins containing four β,β′-butano and β,β′-benzo fused ringsWeijie Xu, Yuanyuan Fang, Zhongping Ou, Mingyuan Chen, and Karl M. KadishJournal of Porphyrins and PhthalocyaninesVol. 22, No. 06Comparative 1HNMR and UV-Visible Studies of Polyene Polymer Epoxidations Catalyzed by Iron(III), Manganese(III) and Chromium(III) PorphyrinsE. M. DAVORAS, R. DIAPER, A. DERVISSI, M. J. TORNARITIS, and A. G. COUTSOLELOSJournal of Porphyrins and PhthalocyaninesVol. 02, No. 01Distortion effect on the ligation of imidazoles to water-insoluble iron(III) porphyrinHirofumi Konno, Yoichi Nonomura, and Yasushi KishimotoJournal of Porphyrins and PhthalocyaninesVol. 27, No. 12Electron transfer in electron donor-acceptor ensembles containing porphyrins and metalloporphyrinsDirk M. Guldi and Shunichi FukuzumiJournal of Porphyrins and PhthalocyaninesVol. 06, No. 04 Accepted Papers Supplemental MaterialsMetrics Downloaded 0 times History Received 19 December 2024 Accepted 8 January 2025 PDF download

10.1142/s1088424625500087

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Fundamental study of TiO<inf>2</inf> nanoparticles as photoactive elements for water decontamination

Joel Molina‐Reyes Alejandra Romero‐Morán

Access to potable water is currently a major concern due to population growth and the decline in clean water sources. One of the most important processes applied during the treatment of water, is the removal of pathogens as bacteria due that can reduce the preventable mortality of infectious intestinal diseases. Previous studies on the manufacture of films based on rutile-phase titanium dioxide nanoparticles embedded in an inorganic SOG matrix on Corning glasses showed moderate photocatalytic activity against the inactivation of E. coli. However, the preparation conditions of these films must be improved, and their photocatalytic activity in the inactivation of E. coli using titanium dioxide in anatase phase titanium dioxide with a lower particle size must be evaluated. In this study, the ideal conditions for the synthesis of nanoparticles and preparation of titanium dioxide films for their subsequent application in photocatalytic reactions for the inactivation of pathogens were found. An increase in the titanium dioxide films photocatalytic activity in the inactivation of bacteria was obtained with respect to those previously reported.

Titanium Dioxide

Rutile

Human decontamination

10.1109/mhtc.2017.7926201

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Influence of Laser Modulation Frequency on the Performance of Terahertz Photoconductive Switches on Semi-Insulating GaAs Exhibiting Negative Differential Conductance

IEEE Transactions on Terahertz Science and Technology (2021)

Gaudencio Paz-Martínez C. G. Treviño-Palacios Joel Molina‐Reyes Alejandra Romero‐Morán Eric Cervantes-Garcia

In typical terahertz time-domain spectroscopy systems, the use of the lock-in technique is necessary because of the low current induced at the receiver so that the laser pump beam must be modulated (chopped) at a frequency much lower than the laser repetition rate. This work shows that, in the case of semi-insulating GaAs (SI-GaAs) antennas, this modulation has an important effect on the antenna current and consequently, on the radiated electromagnetic pulse. There exists a threshold bias (whose value depends on the chopping frequency) where an abrupt increase in the current and consequently, in the terahertz emission takes place. The calculated energy of the pulse below and above the threshold shows that the energy doubles. The exact bias voltage at which this occurs changes with the laser modulation frequency when this is below 350 Hz, but at higher frequencies, the threshold remains almost constant. The experiments show that the responsibility for this behavior is the S-shape negative differential conductance exhibited by SI-GaAs originated by a slow field-enhanced charge trapping mechanism, which is also an important source of noise at the receiver of the system.

Biasing

Modulation (music)

Terahertz time-domain spectroscopy

Photoconductivity

10.1109/tthz.2021.3083926

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Citations (4)

Standardized Figures of Merit for Proper Benchmarking of Photocatalytic Inactivation of Bacteria Using Thin Films Based on TiO₂ Nanostructures

Small (2023)

Alejandra Romero‐Morán Joel Molina‐Reyes

Abstract The study of photocatalysts fixed to surfaces for the inactivation of bacteria in wastewater has increased in recent years. However, there are no standardized methods to analyze the photocatalytic antibacterial activity of these materials, and no systematic studies have attempted to relate this activity to the number of reactive oxygen species generated during UV‐light irradiation. Additionally, studies regarding photocatalytic antibacterial activity are usually carried out with varying pathogen concentrations, UV light doses, and catalyst amounts, making it difficult to compare results across different materials. The work introduces the photocatalytic bacteria inactivation efficiency (PBIE) and bacteria inactivation potential of hydroxyl radicals (BIPHR) figures of merit for evaluating the photocatalytic activity of catalysts fixed onto surfaces for bacteria inactivation. To demonstrate their applicability, these parameters are calculated for various photocatalytic TiO 2 ‐based coatings, accounting for the catalyst area, the kinetic reaction rate constant associated with bacteria inactivation and hydroxyl radical formation, reactor volume, and UV light dose. This approach enables a comprehensive comparison of photocatalytic films prepared by different fabrication techniques and evaluated under diverse experimental conditions, with potential applications in the design of fixed‐bed reactors.

Hydroxyl radical

10.1002/smll.202302710

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Citations (1)

Urea Oxidation on Ni(OH)₂ _-X(SO₄)_0.5 _x·yH₂o / C-PVC Composite Electrodes

Meeting abstracts/Meeting abstracts (Electrochemical Society. CD-ROM) (2014)

Alejandra Romero‐Morán Miguel Ángel González Fuentes Ma. de la Paz Elizalde-González Martín M. Dávila-Jiménez

The structural and physical properties of α-Ni(OH) 2 materials have been studied because the great importance of this compound in catalysis and for the development of high performance devices. Recently, research efforts have been focused on the synthesis of nanostructured nickel hydroxide with several morphologies [1]. It has been reported that electrodes modified with nickel species present a strong electrooxidation activity in front of organic compounds in alkaline medium [2]. The objective of this work was the preparation of nanostructured Ni(OH) 2 -x (SO 4 ) 0.5 x ·yH 2 Oby hydrothermal method and their characterization by XRD, IR, AFM and SEM. These nanopowders of nickel hydroxide were supported on C-PVC composite electrodes for their electrochemical characterization by cyclic and differential pulse voltammetry. The Ni(OH) 2 -x (SO 4 ) 0.5 x ·yH 2 O/C-PVC electrode showed good eletrocatalytic activity in the oxidation of urea and high anodic current was observed during the reverse scan (Figure 1). Figure 1. Electrocatalytic response of Ni(OH) 2 -x (SO 4 ) 0.5 x ·yH 2 O/C-PVC electrode in absence (a) and presence of urea (b) in alkaline medium. References [1] T. Gao, B. P. Jelle, J. Phys. Chem. C 117 (2013) 17294−17302 [2] D. Wang, W. Yan, S. H. Vijapur, G. G. Botte, J. Power Sources 217 (2012) 498-502 Acknowledgements We acknowledge the financial support of VIEP- BUAP under project No.2014 and CONACyT by the scholarships to A. Romero-Morán.

Differential pulse voltammetry

10.1149/ma2014-02/49/2213

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Electrostatically charged rutile TiO2 surfaces with enhanced photocatalytic activity for bacteria inactivation

Catalysis Today (2022)

Alejandra Romero‐Morán Anaí Zavala-Franco José Luis Sánchez‐Salas M.A. Méndez-Rojas Joel Molina‐Reyes

Rutile

Titanium Dioxide

10.1016/j.cattod.2022.01.002

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Citations (11)