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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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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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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...
Colors and Magnetism03:02

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When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
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Published on: June 10, 2021

New photoluminescence acylhydrazidate-coordinated complexes.

Juan Jin1, Fu-Quan Bai, Ming-Jun Jia

  • 1College of Chemistry and State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Jiefang Road 2519, Changchun, 130023, PR China.

Dalton Transactions (Cambridge, England : 2003)
|December 27, 2011
PubMed
Summary
This summary is machine-generated.

Five new metal-organic compounds containing acylhydrazidate ligands were synthesized and characterized. These fluorescent materials exhibit distinct photoluminescence properties, with potential applications in materials science.

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A Novel Technique for Generating and Observing Chemiluminescence in a Biological Setting
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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
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A Novel Technique for Generating and Observing Chemiluminescence in a Biological Setting
08:57

A Novel Technique for Generating and Observing Chemiluminescence in a Biological Setting

Published on: March 9, 2017

Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Photoluminescence

Background:

  • Acylhydrazidate ligands offer versatile coordination modes for metal ions.
  • Hydrothermal synthesis provides a controlled environment for crystal growth.
  • Understanding structure-property relationships in metal-organic compounds is crucial for developing new materials.

Purpose of the Study:

  • To synthesize and characterize novel acylhydrazidate-containing metal complexes.
  • To investigate the photoluminescent properties of the synthesized compounds.
  • To elucidate the electronic origins of the observed luminescence.

Main Methods:

  • Hydrothermal synthesis was employed to obtain five new metal-organic compounds.
  • Characterization included X-ray crystallography and photoluminescence spectroscopy.
  • Density Functional Theory (DFT) calculations were performed on compound 3.

Main Results:

  • Five new compounds were successfully synthesized: [Cd(EPDH)(2)(H(2)O)] 1, [Cd(MPDH)(2)] 2, [Zn(MPDH)(2)(H(2)O)(2)]·2H(2)O 3, [Pb(2)(ODPTH)(2)(phen)(2)(H(2)O)(2)] 4, and [Cd(2)(APTH)(4)(phen)(2)]·2H(2)O 5.
  • All synthesized compounds exhibit fluorescence, with emission maxima ranging from 413 nm to 563 nm.
  • DFT calculations suggest ligand-based emission involving charge transfer from acylhydrazidate to pyridine rings in compound 3.

Conclusions:

  • The study successfully synthesized and characterized novel acylhydrazidate-metal complexes.
  • The compounds demonstrate promising fluorescent properties.
  • The findings contribute to the understanding of luminescence mechanisms in such materials.