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Related Concept Videos

Structural Isomerism02:34

Structural Isomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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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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Ladder Diagrams: Complexation Equilibria01:07

Ladder Diagrams: Complexation Equilibria

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Ladder diagrams are useful for evaluating equilibria involving metal-ligand complexes. The vertical scale of the ladder diagram represents the concentration of unreacted or free ligand, pL. The horizontal lines on the scale depict the log of stepwise formation constants for metal-ligand complexes and indicate the dominant species in all the regions.
The formation constant, K1, for the formation of Cd(NH3)2+ complex from cadmium and ammonia is 3.55 × 102. Log K1 (i.e. pNH3) is 2.55, and...
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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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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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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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Syntheses, Crystal Structures and Characterization of Two New Lanthanide Mercury Halide Compounds.

Xi-Yu Shao1, Hao-Dong Liu2, Long-Hua Zeng3

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Acta Chimica Slovenica
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Two novel lanthanide mercury halide compounds were synthesized, exhibiting distinct 1-D and 2-D structures. These materials display unique ultraviolet upconversion and red photoluminescence, with potential applications in optoelectronics.

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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Solid-State Chemistry

Background:

  • Lanthanide mercury halide compounds are of interest due to their diverse structures and photoluminescent properties.
  • Isonicotinic acid and N,N'-Dimethylformamide are common ligands in coordination chemistry.
  • Solvothermal synthesis offers a versatile route for creating complex inorganic materials.

Purpose of the Study:

  • To synthesize and characterize new lanthanide mercury halide compounds using isonicotinic acid as a ligand.
  • To investigate the structural diversity and coordination motifs of the synthesized compounds.
  • To explore the photoluminescent properties and semiconductor band gaps of the new materials.

Main Methods:

  • Solvothermal reactions were employed for the synthesis of the target compounds.
  • Single-crystal X-ray diffraction was used to determine the detailed crystal structures.
  • UV/Vis diffuse reflectance spectroscopy was utilized to analyze semiconductor band gaps and photoluminescence.

Main Results:

  • Two new compounds, [Gd(HIA)2(IA)(H2O)2(HgCl2)]n(nHgCl4)·3nH2O (1) and {[Nd(HIA)3(DMF)(H2O)]n}[(Hg4Br11)n](2HgBr2)(nBr)·nH3O·0.5nH2O (2), were successfully synthesized.
  • Compound 1 exhibits a 2-D layer structure, while compound 2 displays a 1-D chain structure.
  • Compound 1 showed UV upconversion photoluminescence (Gd3+), and compound 2 exhibited red photoluminescence (Nd3+); band gaps were determined as 3.12 eV and 3.23 eV.

Conclusions:

  • The study successfully synthesized and characterized two novel lanthanide mercury halide compounds with distinct structural architectures.
  • The synthesized compounds exhibit characteristic photoluminescence originating from lanthanide ion 4f-4f transitions.
  • The findings contribute to the understanding of structure-property relationships in lanthanide-based coordination materials and suggest potential optoelectronic applications.