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Related Concept Videos

Colors and Magnetism03:02

Colors and Magnetism

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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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Properties of Transition Metals02:58

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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Crystal Field Theory - Octahedral Complexes02:58

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Valence Bond Theory02:42

Valence Bond Theory

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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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Photoluminescence: Applications01:14

Photoluminescence: Applications

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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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Photoluminescence: Fluorescence and Phosphorescence01:23

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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.
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Luminescent First-Row Transition Metal Complexes.

Christina Wegeberg1, Oliver S Wenger1

  • 1Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland.

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A paradigm shift in photophysics and photochemistry moves from rare elements to abundant first-row transition metals. New research reveals diverse applications for 3d-metal coordination compounds in luminescence and photosensitization.

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Area of Science:

  • Inorganic photophysics and photochemistry
  • Coordination chemistry
  • Materials science

Background:

  • Traditionally, precious and rare elements dominated inorganic photophysics and photochemistry.
  • Recent advances show a paradigm shift towards using cheaper, abundant metals.
  • Emissive complexes based on first-row transition metals are gaining prominence.

Purpose of the Study:

  • To survey recent conceptual advances in using abundant metals for photophysics and photochemistry.
  • To identify design strategies for novel 3d-metal-based luminophores and photosensitizers.
  • To highlight the potential of earth-abundant elements in developing new functional materials.

Main Methods:

  • Review of recent literature on first-row transition metal coordination compounds.
  • Analysis of conceptual breakthroughs in inorganic photophysics and photochemistry.
  • Identification of design principles for creating new 3d-metal-based photoluminescent materials.

Main Results:

  • Coordination compounds of V, Cr, Mn, Fe, Co, Ni, and Cu exhibit unique photoluminescence and reactivity.
  • Fundamentally new types of 3d-metal-based luminophores and photosensitizers have been discovered.
  • These novel materials demonstrate functionality in solution at room temperature.

Conclusions:

  • A broader range of first-row transition metals can be utilized in photophysics and photochemistry.
  • Strategic design enables the development of efficient 3d-metal-based light-emitting and photosensitizing materials.
  • This shift towards abundant metals offers sustainable and cost-effective alternatives in the field.