Article
Chemistry, Multidisciplinary
Samuel E. Hoff, Desire Di Silvio, Ronald F. Ziolo, Sergio E. Moya, Hendrik Heinz
Summary: Functionalization of nanoparticles with specific ligands can control specific diagnostic and therapeutic responses. This study uses molecular dynamics simulations to investigate self-assembled monolayers of multisegment ligands on gold nanoparticles, showing that they can mimic mixed hydrophobic and hydrophilic ligand coatings, with control over patterns, hydrophilicity, and specific recognition properties.
Article
Chemistry, Organic
Hua-Jian Zhou, Jing-Mei Huang
Summary: A mild and highly efficient method for the hydropyridylation of alpha,beta-unsaturated esters has been developed. This protocol provides the products smoothly with a wide substrate scope in an undivided cell under ambient conditions. Moreover, studies showed that the scope could be extended to other unsaturated compounds, including enones and aldehydes.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Waleed Azzam, Abdu Subaihi, Michael Rohwerder, Michael Zharnikov, Asif Bashir
Summary: In this study, self-assembled monolayers of 4-fluorobenzenemethanethiol on a gold surface were characterized using scanning tunneling microscopy. A highly ordered monolayer with a commensurate structure was observed, and individual spots corresponding to different components of the monolayer were successfully resolved. These results demonstrate the potential of STM for imaging densely packed molecular assemblies.
Article
Chemistry, Multidisciplinary
Jochen Jung, Annika Muench, Regine Herbst-Irmer, Dietmar Stalke
Summary: The valence isoelectronic imido analog of sulfuric acid, H2S(NtBu)(4), was synthesized, isolated, and characterized through NMR spectroscopy and high-resolution X-ray charge density analysis. The study revealed strongly polarized S delta+-N delta- bonds with minimal double bond character, showcasing the versatile nature of sulfur nitrogen ligands in adapting to different electron requirements of various metal cations.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Electrochemistry
Johannes M. Hermann, Heiko Mueller, Layal Daccache, Christiane Adler, Sarah Keller, Martin Metzler, Timo Jacob, Ludwig A. Kibler
Summary: The study investigated the formic acid oxidation reaction on Au(111) electrodes modified by a self-assembled monolayer of 4-mercaptopyridine. It found that the adsorption of 4,4'-dithiodipyridine on the electrodes significantly enhanced the electrocatalytic activity for FAOR. Various parameters such as the position of pyridine nitrogen, adsorption of SAM molecules, and availability of free gold sites exerted distinct effects on the formic acid oxidation reaction, resulting in different levels of enhancement of electrocatalytic activity.
ELECTROCHIMICA ACTA
(2021)
Article
Spectroscopy
Kaiqiang Wang, Jinjie Li
Summary: In this study, a high-performance surface-enhanced Raman spectroscopy (SERS) analytic platform was developed through self-assembly of nanoparticles and achieved high reproducibility and accuracy for measuring chemical contaminants in various phases. The use of an internal standard to correct signal fluctuations improved point-to-point and batch-to-batch reproducibility, enabling high-sensitive detection and improved accuracy for pesticide analysis.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Physics, Applied
Xin Cao, Jingzhong Yang, Pengji Li, Yiteng Zhang, Eddy P. Rugeramigabo, Benedikt Brechtken, Rolf J. Haug, Michael Zopf, Fei Ding
Summary: Epitaxially grown GaAs/AlGaAs quantum dots located only 20nm below the surface exhibit high-purity single photon emission with improved optical properties achieved through chemical surface passivation with sulfur compounds. This paves the way for the realization of hybrid nanophotonic devices with near-field coupling and high-quality optical properties.
APPLIED PHYSICS LETTERS
(2021)
Review
Chemistry, Multidisciplinary
Limin Wang, Ulrich S. Schubert, Stephanie Hoeppener
Summary: Surface modification using self-assembled monolayers has seen significant advancement in the past decade, with the introduction of new chemical reactions such as nucleophilic substitution, click chemistry, supramolecular modification, photochemical reaction, and others, enhancing the properties of solid substrates like silicon and glass.
CHEMICAL SOCIETY REVIEWS
(2021)
Article
Chemistry, Multidisciplinary
Christopher A. Petroff, Giuseppe Cassone, Jiri Sponer, Geoffrey R. Hutchison
Summary: This study presents novel piezoelectric force and touch sensors based on self-assembled monolayers of oligopeptides, which show large piezoelectric voltage response and are easily manufactured. Despite modest piezoelectric charge constants, the devices exhibit immense piezoelectric voltage constants. Additionally, a flexible device prototype with high open-circuit voltages is demonstrated, with potential for further improvements in voltage response through peptide selection and device construction.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Analytical
Wei Luo, Yali Hu, Haina Zhang, Ruo Yuan, Xia Yang
Summary: Liquid-liquid interface self-assembly is proposed as an efficient strategy for SERS detection. By introducing ternary nanoparticles and utilizing the differences in material hydrophilicity, the stability of the self-assembled SERS substrate can be improved. In addition, a dual nucleic acid amplification strategy is designed for ultrasensitive detection of target microRNA 21.
ANALYTICA CHIMICA ACTA
(2022)
Article
Optics
Zhengkun Wang, Haiyang Sha, Ke Yang, Yong Zhu, Jie Zhang
Summary: In this study, the plasmonic response of self-assembled monolayer silver nanoparticles was comprehensively investigated using various computational and experimental techniques. The Fano resonance and SERS application were studied, and it was found that the higher-energy antibonding mode is not only from the antibonding dipole-dipole mode, but also from the antibonding quadrupole-quadrupole mode and hybridized magnetic mode. The effects of dimer gap and size were discussed in detail, and a two coupled oscillators model was used to illustrate the mechanism of the Fano resonance.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Hong Yuan, Subin Yu, Minju Kim, Ji-Eun Lee, Haeun Kang, Dohyub Jang, Madeshwaran Sekkarapatti Ramasamy, Dong Ha Kim
Summary: This study presents a novel approach for achieving high-performance SERS substrates based on anisotropic hybrid plasmonic nanostructures of gold nanoworms and 2D molybdenum disulfide nanosheets. By optimizing the gap between gold nanoworms and molybdenum disulfide, significant enhancement in SERS enhancement factor was achieved, generating abundant hot spots. This work provides new insights into the rational design of high-performance SERS substrates and has potential for practical and viable biosensing applications.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Multidisciplinary
Dennis Meier, Abhishek K. Adak, Peter Knecht, Joachim Reichert, Sourav Mondal, Nithin Suryadevara, Senthil Kumar Kuppusamy, Keitaro Eguchi, Matthias K. Muntwiler, Francesco Allegretti, Mario Ruben, Johannes V. Barth, Shobhana Narasimhan, Anthoula C. Papageorgiou
Summary: Tailored nano-spaces can control enantioselective adsorption and molecular motion through the spontaneous assembly of a dynamic system on Ag(111) using 2,6-bis(1H-pyrazol-1-yl)pyridine-4-carboxylic acid. The network cavity snugly hosts the chemically modified guest, bestows enantiomorphic adsorption, and allows selective rotational motions. Hydrogen bonding plays a crucial role in stabilizing the rotating guest and influencing the energy landscape formation.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Physical
Yangyang Zhang, Hao Wu, Zhenghao Liu, Shuhong Xie, Jiangyu Li
Summary: Surface-Enhanced Raman Spectroscopy is of great interest due to its ability to detect various molecules at trace levels. MoO2 nanocones self-assembled into hollow spheres exhibit excellent performance, with a detection limit of 10(-9)M for Rhodamine 6G. The morphology control of hollow MoO2 spheres was also discussed in the paper.
JOURNAL OF MATERIOMICS
(2021)
Article
Chemistry, Multidisciplinary
Shakil N. N. Afraj, Chun-Hsiao Kuan, Jian-Sing Lin, Jen-Shyang Ni, Arulmozhi Velusamy, Ming-Chou Chen, Eric Wei-Guang Diau
Summary: Four X-shaped quinoxaline-based organic dyes, PQx (1), TQx, (2), PQxD (3), and TQxD (4), are developed as p-type self-assemble monolayer (SAM) for tin perovskite solar cells (TPSC). The thermal, optical, and electrochemical properties of these SAMs are thoroughly investigated. Tin perovskite layers are successfully deposited on these SAM surfaces using a two-step approach, and the achieved device performance follows the order of TQxD (8.3%) > TQx (8.0%) > PQxD (7.1%) > PQx (6.1%). Among them, TQxD (4), with a thiophene pi-extended conjugation unit in the SAM structure, exhibits the highest hole extraction rates, greatest hole mobilities, and slowest charge recombination, leading to the best reported efficiency of 8.3% for SAM-based TPSC. Moreover, all devices except PQx show good enduring stability, retaining approximately 90% of their original values after 1600 hours of shelf storage.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Juliana S. do Nascimento, Aurideia P. de Sousa, Ana C. S. Gondim, Eduardo H. S. Sousa, Edson H. Teixeira, Luiz Gonzaga do Nascimento Neto, Beatriz Pinheiro Bezerra, Alejandro Pedro Ayala, Alzir A. Batista, Igor F. Vasconcelos, Francisco G. S. Oliveira, Alda K. M. Holanda
Summary: A new binuclear metal complex has been synthesized and shown to exhibit DNA cleavage activity in vitro. This study further demonstrates the essential role of metal binding to an anthracycline-like moiety in the generation of reactive oxygen species (ROS).
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Physical
Lucas F. Bezerra, Monilson P. Reis, Adolfo I. B. Romo, Dieric S. Abreu, Marcelo H. Gehlen, Elisane Longhinotti, Tercio F. Paulo, Idalina M. M. Carvalho, Izaura C. N. Diogenes
Summary: Photophysical studies on derivatives of 4'-methyl-2,2'-bipyridine with polycyclic aromatic hydrocarbons showed red shifts and broadening of emission spectra with increasing solvent polarity, indicating a dominant charge transfer contribution in high polar solvents. Theoretical calculations found a mixing of local excited-state and charge transfer states in moderately polar solvents, corroborated by the observed single exponential decay lifetimes.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2022)
Article
Biochemistry & Molecular Biology
Kesya Amanda Dantas Rocha, Tercio de Freitas Paulo, Alejandro Pedro Ayala, Valeria da Silva Sampaio, Paulo Iury Gomes Nunes, Flavia Almeida Santos, Kirley Marques Canuto, Edilberto Rocha Silveira, Otilia Deusdenia Loiola Pessoa
Summary: In this study, unknown Withajardin compounds and known tuboanosigenin were isolated from the leaves of Athenaea velutina. Their structures and absolute configurations were determined using various analytical techniques, and their anti-inflammatory activity was evaluated.
Article
Chemistry, Physical
Maria K. S. O. Abreu, Maria A. S. Silva, Dieric S. Abreu, Ana R. Richter, Regina C. M. de Paula, Vera R. L. Constantino, Igor F. Vasconcelos, Francisco G. S. de Oliveira, Acacio S. de Melo, Marcio A. Correa, Izaura C. N. Diogenes
Summary: This study improves the colloidal stability of CoFe2O4 in water media by encapsulating it in CMCG. The results show that after encapsulation, CoFe2O4 forms a polymer-caged MNPs aggregate with a negatively charged layer. Despite the dilution effect of CMCG, the material maintains magnetization.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Biochemistry & Molecular Biology
Patricia H. R. Martins, Adolfo I. B. Romo, Francisco O. N. da Silva, Otaciro R. Nascimento, Joaquin Rodriguez-Lopez, Izaura C. N. Diogenes, Luiz G. F. Lopes, Eduardo H. S. Sousa
Summary: The role and reactivity of metal complexes in interacting with DNA, especially metallonitrosyl compounds, have been poorly investigated. A nitrosyl compound cis-[Ru(bpy)(2)(SO3)(NO)](PF6)(A) exhibited promising biological activities, while a final product cis-[Ru(bpy)(2)(SO3)(H2O](B) showed important reactivity with H2O2 causing DNA degradation. The aqua product of the nitrosyl ruthenium complex should be further studied for its potential genotoxicity to DNA.
JOURNAL OF INORGANIC BIOCHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Juliana M. da Silva, Carlos E. P. da Silva, Jessica M. A. Freire, Helena Becker, Izaura C. N. Diogenes, Elisane Longhinotti
Summary: This study explores the potential of using steel waste as adsorbents to mitigate eutrophication and phosphate pollution in water bodies. The results show that blast furnace sludge can be reutilized, while the powder from Kanbara reactor is not suitable for reuse due to its strong interaction with phosphate. Furthermore, the study demonstrates that phosphate can be rapidly removed within a short period, offering the opportunity to add economic value to steel industry waste.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Medicine, Research & Experimental
Pedro Martins da Silva, Iury Araujo Paz, Nilberto Robson Falcao do Nascimento, Dieric S. Abreu, Luiz Gonzaga de Franca Lopes, Eduardo Henrique Silva Sousa, Elisane Longhinotti
Summary: Sodium nitroprusside (SNP), a drug used to treat severe hypertension in hospital emergency settings, has emerged with new clinical uses in recent years. This drug functions by releasing nitric oxide (NO), but due to its short lifetime, NO donor molecules are used for administration. Currently, there are various drug delivery strategies that can overcome the limitations of SNP, providing new opportunities for its use. This Perspective highlights the properties of SNP and emphasizes the potential therapeutic uses arising from the use of drug delivery systems such as silica-based nanoparticles.
MOLECULAR PHARMACEUTICS
(2023)
Article
Chemistry, Multidisciplinary
Tiago S. Pacheco, Zelia M. C. Ludwig, Victor H. Oliveira, Ingrid D. Barcelos, Rafael L. de Souza, Edinei C. Paiva, Maximiliano D. Martins, Flavia C. Marques, Gustavo F. S. Andrade, Santunu Ghosh
Summary: In this study, we synthesized and studied the spectroscopic properties of (NH4)2(SO4)2Y(H2O)6 (Y = Ni, Mg) crystals doped with AgNO3 or H3BO3. The effects of dopants on the vibrational modes of the ligands NH4 and SO4, complexes Mg(H2O)6 and Ni(H2O)6, and H2O molecules present in these crystals were investigated using Raman and infrared spectroscopies. The presence of Ag and B dopants and their influence on the crystal lattice were identified through band analysis. Thermogravimetric measurements showed an increase in the initial temperature of crystal degradation due to the presence of dopants. Raman spectroscopy of the crystal residues after thermogravimetric measurements provided insights into the degradation processes occurring after crystal pyrolysis.
Article
Chemistry, Applied
Lucas F. Bezerra, Tercio F. Paulo, Idalina M. M. de Carvalho, Florencio S. Gouveia Junior, Luiz G. F. Lopes, Izaura C. N. Diogenes
Summary: Molecules with reversible photoreactions, such as dipyridoquinoxalinophenazine (dpqpz), have the potential to be used as photocatalysts in electron transfer reactions for molecular switch design. This study demonstrates the reversible redox-responsive fluorescence emission of dihydro-dpqpz, which can recover its original form upon air contact. The emission efficiency of dihydro-dpqpz is influenced by the solvent polarity, with protic solvents showing strong emission suppression due to hydrogen bonding effects.
Article
Chemistry, Inorganic & Nuclear
Florencio Sousa Gouveia Junior, Joao Alison de Moraes Silveira, Thais Muratori Holanda, Aline Diogo Marinho, Lisa A. Ridnour, David A. Wink, Rodrigo Jose Bezerra de Siqueira, Helena Serra Azul Monteiro, Eduardo Henrique Silva de Sousa, Luiz Gonzaga de Franca Lopes
Summary: In this study, two new nitrosyl ruthenium complexes were developed and characterized. These complexes showed potential for releasing nitric oxide and nitroxyl, which can be beneficial for cardiovascular diseases. They also demonstrated antioxidant and vasodilating properties.
DALTON TRANSACTIONS
(2023)
