Macarena Rojas‐Poblete

Universidad SEK

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Raúl Guajardo‐Maturana

Universidad SEK

ÁM

Álvaro Muñoz-Castro

San Sebastián University

Peter L. Rodríguez‐Kessler

Centro de Investigaciones en Optica

Eduardo Schott

Pontificia Universidad Católica de Chile

Luís Velásquez

Universidad SEK

Cristian Linares‐Flores

San Sebastián University

Ramiro Arratia‐Pérez

Universidad Andrés Bello

Cristián Tirapegui

Universidad Autónoma de Chile

Claudia Torrent

Universidad de Santiago de Chile

Carolina Mascayano

Universidad de Santiago de Chile

Cooperative Institutions

Universidad de Santiago de Chile

Universidad Andrés Bello

University of Chile

Universidad Bernardo O'Higgins

Pontificia Universidad Católica de Chile

Universidad Autónoma de Chile

Universidad Mayor

Universidad Tecnológica de Santiago

San Sebastián University

Higher Institute of Technologies and Applied Sciences

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Coinage-metal pillarplexes hosts. Insights into host–guest interaction nature and luminescence quenching effects

Physical Chemistry Chemical Physics (2021)

Macarena Rojas‐Poblete Peter L. Rodríguez‐Kessler Raúl Guajardo‐Maturana Álvaro Muñoz-Castro

Host–guest chemistry is a relevant issue in materials science, which encourages further development of versatile host structures.

10.1039/d1cp00849h

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Citations (7)

Teaching of the Basic Concepts of High-Performance Liquid Chromatography (HPLC ) With a Collaborative and Linked learning Approach: Determination of Acrolein in Cigarette Smoke

Educación Química (2019)

Oscar Ricardo Donoso Tauda Andrés Palma Valencia Macarena Rojas‐Poblete Jaime Urrutia Méndez

This article presents a project-based activity which correspond to a contextualized (linked) laboratory experience that use the scientific method performed with students of the undergraduate program “Tecnología en Análisis Químico” (TAQ) at “Universidad Tecnológica de Chile, INACAP” and whose emphasis was to contribute to the theoretical-practical learning of basic concepts of the High Performance Liquid Chromatography (HPLC) trough the implementation of an analytical method for the determination of chemical substances from “real-life products”.In this case, the students participated directly and actively in all the stages that allowed to estimate the concentration of acrolein, a highly toxic compound contained in cigarette smoke, acquiring in the process the fundamental skills of this instrumental analysis technique, which is a tool widely used in the field work of the chemical analyst.Finally, our main objective is to carry out a practical laboratory activity focused on the chemical contextualization in order to promote effective learning, linking students in a broad social context beyond the classroom or laboratory, taking advantage of the intrinsic motivation that a significant activity can generate.

Contextualization

Acrolein

10.22201/fq.18708404e.2019.3.69368

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Chemical Analysis of the Resinous Exudate Isolated from Heliotropium taltalense and Evaluation of the Antioxidant Activity of the Phenolics Components and the Resin in Homogeneous and Heterogeneous Systems

Molecules (2009)

Brenda Modak Macarena Rojas‐Poblete René Torres

H. taltalense (Phil.) Johnst. (Heliotropiaceae) is an endemic species of the northern coast of Chile that produces a resinous exudate that covers its foliar surface and stems. Its chemical composition was analyzed for the first time, and two aromatic geranyl derivatives: filifolinol and filifolinyl senecionate and three flavonoids – naringenin, 3-O-methylgalangin and 7-O-methyleriodictiol – were isolated. The antioxidant activity of the flavonoids and the resinous exudates was carried out by measuring the 1,1-diphenyl-2-picrylhydrazyl (DPPH) bleaching effect in ethanolic solution and in sodium dodecyl sulfate (SDS) micelles. The influence of the reaction medium was analyzed. The initial velocity reactions for the pure compounds and for the extract were higher in SDS media than in ethanolic solution. The velocity of reaction observed was interpreted in terms of the reaction medium environment in the micelle.

Exudate

Sodium dodecyl sulfate

10.3390/molecules14061980

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Citations (28)

Antioxidant Activity of a New Aromatic Geranyl Derivative of the Resinous Exudates from Heliotropium glutinosum Phil.

Molecules (2007)

Brenda Modak Macarena Rojas‐Poblete René Torres Jesús M. Rodilla Federico Luebert

Heliotropium glutinosum Phil. (Heliotropiceae) is a resinous bush that grows at a height of 2000 m in Chañaral, Chile. From the resinous exudates of Heliotropium glutinosum Phil. a new aromatic geranyl derivative: 4-methoxy-3-[(2)-7’-methyl-3’-hydroxymethyl-2’,6’-octadienyl] phenol (1) and three flavonoids: 5,3'-dihydroxy-7,4'-dimethoxyflavanone (2), 5,4'-dihydroxy-7-methoxyflavanone (3) and 4'-acetyl-5-hydroxy-7-methoxyflavanone (4) were isolated and their structures were determined. Their antioxidant activity were evaluated using the bleaching of ABTS and DPPH derived cation radical methods and expressed in terms of FRE (fast reacting equivalents) and TRE (total reacting equivalents), where FRE is a good measure of the quick protection of a given compound against oxidants and TRE measures the degree of long-term protection of the antioxidant, or how effective it is against a strong oxidative stress.

ABTS

Hydroxymethyl

Derivative (finance)

10.3390/12051057

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Citations (26)

Evaluation of ultrasmall coinage metal M₁₃(dppe)₆ M = Cu, Ag, and Au clusters. Bonding, structural and optical properties from relativistic DFT calculations

Physical Chemistry Chemical Physics (2021)

Peter L. Rodríguez‐Kessler Macarena Rojas‐Poblete Álvaro Muñoz-Castro

Ultrasmall ligand-protected clusters are prototypical species for evaluating the variation at the bottom of the nanoscale range.

Relativistic quantum chemistry

10.1039/d1cp02451e

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Citations (7)

Corrigendum to ‘Easy and rapid preparation of benzoylhydrazides and their diazene derivatives as inhibitors of 15-lipoxygenase’ [Bioorg. Med. Chem. Lett. 27 (2017) 1649–1653]

Bioorganic & Medicinal Chemistry Letters (2017)

Cristián Tirapegui Williams Acevedo-Fuentes Pablo Dahech Claudia Torrent Pablo Barrías

10.1016/j.bmcl.2017.07.065

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4’–Phenyl -2, 2’: 6’, 2’’-Terpyridine Derivatives as Metal Chemosensors. Chelation and Fluorescence Capabilities Towards Zn(Ii), Cd(Ii), and Hg(Ii) from Experiment and Theory

Macarena Rojas‐Poblete Raúl Guajardo‐Maturana Álvaro Muñoz-Castro Luís Velásquez

Download This Paper Open PDF in Browser Add Paper to My Library Share: Permalink Using these links will ensure access to this page indefinitely Copy URL Copy DOI

Terpyridine

10.2139/ssrn.4769584

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Bonding and optical properties of spirocyclic-phosphazene derivatives. A DFT approach

Physical Chemistry Chemical Physics (2017)

Raúl Guajardo‐Maturana Marı́a Luisa Valenzuela Eduardo Schott Macarena Rojas‐Poblete

The bonding properties of phosphazenes and spirocyclophosphazenes containing tris-2,2'-dioxybiphenyl groups and their derivatives were investigated by means of different computational techniques. Electronic delocalization and phosphazene-ligand bonding were studied in terms of natural bond orbitals (NBOs) and energy decomposition (EDA) analysis in combination with the natural orbital for chemical valence (NOCV), which showed the dependency of the charge transfer with the electron delocalization. TD-DFT calculations were employed to study the absorption profile of the studied molecules and to contrast the redshift and change in intensities of the λmax. An assessment of second-order stabilization energies, ΔE2, within the NBO analysis revealed clear differences between the cyclic-phosphazene arrays. The EDA-NOCV showed that the ligand-phosphazene charge transfer is stronger in phosphazene with amine substituents (4c), which is due to the donor character of the substituent over the phenyl ring. The NBO analysis confirmed either the inflow or outflow of charge due to the influence of the electron donor or electron withdrawing groups.

Phosphazene

10.1039/c7cp06064e

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Citations (14)

Electronic pathway of the exciplex emitters. Unraveling the emission properties from theoretical calculations

Journal of Photochemistry and Photobiology A Chemistry (2024)

Francisca Clavería-Cádiz Macarena Rojas‐Poblete Álvaro Muñoz-Castro Eduardo Schott Raúl Guajardo‐Maturana

Excimer

Organic Electronics

10.1016/j.jphotochem.2024.115547

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Citations (3)

Nature and Role of Formal Charge of the Ion Inclusion in Hexanuclear Platinium(Ii) Host-Guest Species. Insights from Relativistic Dft Calculations

SSRN Electronic Journal (2022)

Álvaro Muñoz-Castro Macarena Rojas‐Poblete Peter L. Rodríguez‐Kessler Raúl Guajardo‐Maturana

The favorable formation of [Pt 6 (SR) 12 ⊃Ag] + host-guest species exhibits the ability of the [Pt 6 (SR) 12 ] host to incorporate metallic ions at the inner cavity, offering an interesting template for further evaluation of the ion-inclusion nature. Our results show a sizable interaction of -129.1 kcal·mol –1 between Ag(I) and [Pt 6 (SR) 12 ], of mainly charge-transfer (covalent) character, followed by a contribution from its electrostatic character, and to a small extent from London dispersion type interactions, larger than evaluated for organic hosts. The proposed Cu(I) and Au(I) species exhibit enhanced interaction energy, suggesting the plausible formation of host-guest pairs along with the coinage metal group.

10.2139/ssrn.4145713

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