Results 41 to 50 of about 370 (171)

Geochemical Variations in Sedimentary Records of Oxygen‐Depleted Marine Environments in Representative Geological Periods: New Perspectives From an Independent Component Analysis

open access: yesPaleoceanography and Paleoclimatology, Volume 40, Issue 4, April 2025.
Abstract Throughout the Phanerozoic, the oceans repeatedly became oxygen depleted and deposited marine sediments called black shales. The mechanisms responsible for the compositional variability of black shales deposited at different times and places, however, are not yet fully understood.
M. Yano   +6 more
wiley   +1 more source

Chromatographic Enrichment and Subsequent Separation of Nickel and Vanadyl Porphyrins from Natural Seeps and Molecular Characterization by Positive Electrospray Ionization FT-ICR Mass Spectrometry

open access: yes, 2016
We report a novel chromatographic method to enrich and separate nickel and vanadyl porphyrins from a natural seep sample and combine molecular level characterization by positive-ion electrospray ionization Fourier transform ion cyclotron resonance mass ...
Jonathan C. Putman (1727032)   +3 more
core   +1 more source

Ordered assembly of non-planar vanadyl-tetraphenylporphyrins on ultra-thin iron oxide [PDF]

open access: yes, 2022
Stabilizing ordered assemblies of molecules represents the first step towards the construction of molecular devices featuring hybrid (organic-inorganic) interfaces where molecules can be easily functionalized in view of specific applications.
Floreano, Luca   +11 more
core   +1 more source

Magnetic Molecules as Building Blocks for Quantum Technologies

open access: yesAdvanced Quantum Technologies, Volume 8, Issue 2, February 2025.
Quantum effects have led to advanced technologies like quantum sensing and computing, requiring precise manipulation of quantum states. Magnetic molecules are promising candidates for such tasks due to their controllable properties, coherence preservation, and ability to function as qubits or qudits.
Eufemio Moreno‐Pineda   +1 more
wiley   +1 more source

Broad-band spectroscopy of a vanadyl porphyrin: a model electronuclear spin qudit

open access: yesChemical Science, 2021
We show that a sizeable electronuclear entanglement of the S = 1/2 and I = 7/2 spins of a vanadyl porphyrin provides the conditions to act as a universal 4-qubit processor, and thus implement quantum error correction at the molecular level.
Gimeno, Ignacio   +7 more
openaire   +6 more sources

High-Resolution ENDOR Studies on Vanadyl Porphyrins and Crude-Oil Petroporphyrins

open access: yes, 2020
Thesis (Ph.D.)--University of Washington, 2020An open area of inquiry in chemistry research is the chemical environment surrounding vanadyl ions and particularly vanadyl porphyrins in crude oil.
Mannikko, Donald D
core  

Advances in Exploring Mechanisms of Oxidative Phenolic Coupling Reactions

open access: yesAdvanced Synthesis &Catalysis, Volume 366, Issue 21, Page 4347-4384, November 5, 2024.
Abstract Biphenolic compounds serve as important scaffolds for the development of biologically active molecules. Among the methods for the synthesis of biarenols, oxidative coupling, which directly forms a C−C bond, has been extensively explored in various metal‐catalyzed (V, Cr, Co, Fe, Cu, etc.) reactions, electrochemical reactions, and photochemical
Haeun Choi, Sung‐Eun Suh, Houng Kang
wiley   +1 more source

Computational and Experimental Study of the Structure, Binding Preferences, and Spectroscopy of Nickel(II) and Vanadyl Porphyrins in Petroleum

open access: yes, 2016
We present a computational exploration of five- and six-coordinate Ni(II) and vanadyl porphyrins, including prediction of UV−vis spectroscopic behavior and metalloporphyrin structure as well as determination of a binding energy threshold between strongly
Stanislav R. Stoyanov (1304532)   +5 more
core   +1 more source

Spin‐bearing molecules as optically addressable platforms for quantum technologies

open access: yesNanophotonics, Volume 13, Issue 24, Page 4357-4379, November 2024.
Abstract Efforts to harness quantum hardware relying on quantum mechanical principles have been steadily progressing. The search for novel material platforms that could spur the progress by providing new functionalities for solving the outstanding technological problems is however still active.
Senthil Kumar Kuppusamy   +4 more
wiley   +1 more source

Simultaneous Detection of Vanadyl, Nickel, Iron, and Gallium Porphyrins in Marine Shales from the Eagle Ford Formation, South Texas

open access: yes, 2018
Metalloporphyrins in immature shales of the Late Cretaceous Eagle Ford Formation from South Texas were analyzed by positive-ion electrospray ionization (ESI) Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR MS).
Chang Samuel Hsu (1280709)   +23 more
core   +1 more source

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