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Colors and Magnetism03:02

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Color in Coordination Complexes
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...
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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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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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Isomerism in Complexes
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Updated: May 22, 2025

A Polyaniline-based Sensor of Nucleic Acids
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A Binuclear Zn(II) Complex Giving A Large Fluorescent Response Upon Binding PPi Anion.

Joanne Li1, Yonghao Li1, Yi Pang2

  • 1Department of Chemistry, The University of Akron, Akron, OH, 44325, USA.

Journal of Fluorescence
|May 21, 2025
PubMed
Summary

A novel zinc complex exhibits weak blue fluorescence that intensifies upon cooling. Addition of pyrophosphate ions significantly enhances fluorescence and absorption, indicating potential applications in sensing.

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Area of Science:

  • Coordination Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Binuclear zinc complexes are of interest for their catalytic and sensing properties.
  • Macrocyclic ligands offer structural stability and tunable electronic properties.
  • Fluorescence-based detection of pyrophosphate ions (PPi) is crucial in biological and environmental monitoring.

Purpose of the Study:

  • To synthesize and characterize a binuclear zinc(II)-zinc(II) complex with a macrocyclic ligand.
  • To investigate the photophysical properties of the complex in aqueous solution.
  • To explore the complex's response to temperature changes and pyrophosphate ion addition.

Main Methods:

  • Synthesis of the macrocyclic ligand and its binuclear zinc complex.
  • UV-Vis absorption and fluorescence spectroscopy.
  • Variable temperature spectroscopic studies.
  • Spectroscopic analysis upon addition of pyrophosphate ions.

Main Results:

  • The binuclear zinc complex (2b-Zn2) is stable in aqueous solution with absorption at ~367 nm and weak blue fluorescence at ~424 nm.
  • Fluorescence intensity significantly increased upon cooling the solution.
  • Addition of pyrophosphate ions induced a large bathochromic shift in both absorption (~57 nm) and fluorescence (~106 nm).
  • Spectroscopic data suggest PPi-induced aggregation of the macrocyclic ligand with partial imine bond hydrolysis.

Conclusions:

  • The synthesized binuclear zinc complex exhibits temperature-dependent fluorescence.
  • The complex acts as a sensitive fluorescent probe for pyrophosphate ions.
  • The sensing mechanism involves PPi-induced aggregation and hydrolysis of the macrocyclic ligand.