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Emission Spectra02:39

Emission Spectra

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When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
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Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
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Variables Affecting Phosphorescence and Fluorescence01:26

Variables Affecting Phosphorescence and Fluorescence

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Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
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Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

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Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels.  Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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¿Por qué las moléculas simples con anillos fenílicos "aislados" emiten luz visible?

Haoke Zhang1,2,3, Xiaoyan Zheng1,2, Ni Xie1,2,3

  • 1Department of Chemistry, The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, Hong Kong, China.

Journal of the American Chemical Society
|October 25, 2017
PubMed
Resumen

Se desarrollaron fluoróforos altamente eficientes con espectros de emisión extendidos utilizando moléculas no conjugadas. La conjugación a través del espacio entre anillos fenílicos aislados permite rendimientos cuánticos de alto estado sólido de hasta el 70%.

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Área de la Ciencia:

  • Química orgánica
  • Ciencias de los materiales
  • La fotofísica

Sus antecedentes:

  • Los fluoróforos tradicionales se basan en enlaces π conjugados y anillos aromáticos para una alta eficiencia.
  • Los materiales no conjugados suelen mostrar bajos rendimientos cuánticos de fluorescencia y emiten en la región ultravioleta.

Objetivo del estudio:

  • Sintetizar e investigar las propiedades fotofísicas de moléculas no conjugadas con anillos fenílicos aislados.
  • Explorar el potencial de estos materiales como fluoroforos altamente eficientes con espectros de emisión extendidos.

Principales métodos:

  • Síntesis de tres moléculas no conjugadas: bis- 2,4,5-trimetilfenil) metano, 1,1,2,2-tetracis- 2,4,5-trimetilfenil) etano y 1,1,2,2-tetrafenil etano.
  • Investigación sistemática de sus propiedades fotofísicas, incluidos los espectros de emisión y los rendimientos cuánticos en estado sólido.
  • Análisis experimentales y teóricos para elucidar el mecanismo detrás de la fluorescencia observada.

Principales resultados:

  • Las moléculas no conjugadas sintetizadas exhibieron espectros de emisión que se extendían hasta 600 nm.
  • Se lograron altos rendimientos cuánticos en estado sólido, que alcanzaron hasta el 70%.
  • La conjugación intramolecular a través del espacio entre los anillos fenílicos aislados se identificó como el factor clave de este fenómeno.

Conclusiones:

  • Las estructuras no conjugadas con anillos fenílicos aislados pueden dar lugar a fluoroforos altamente eficientes.
  • La conjugación a través del espacio ofrece una nueva vía para diseñar materiales fluorescentes avanzados.
  • Este trabajo desafía la comprensión convencional y abre nuevas vías en el desarrollo de fluoróforos.