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Related Concept Videos

Coordination Number and Geometry02:57

Coordination Number and Geometry

16.5K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
16.5K
Valence Bond Theory02:42

Valence Bond Theory

9.1K
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...
9.1K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

43.9K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
43.9K
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.6K
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...
14.6K
Colors and Magnetism03:02

Colors and Magnetism

12.3K
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...
12.3K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

27.3K
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...
27.3K

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Related Experiment Video

Updated: Aug 26, 2025

Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
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Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange

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A New Zn(II) Two-dimensional Coordination Polymer: Synthesis, Structure, Highly Efficient Fluorescence and DFT Study.

Fen-Fang Li1

  • 1Jinzhong university. lffspring@126.com.

Acta Chimica Slovenica
|October 5, 2022
PubMed
Summary

A novel two-dimensional coordination polymer featuring zinc ions and a pyrazole-dicarboxylic acid ligand was synthesized. This material exhibits interesting luminescent properties and a unique 3D framework assembled from 2D sheets via pi-pi stacking and hydrogen bonds.

Keywords:
1,1'-(1,4- phenylenebis(methylene)) bis-(1H-pyrazole-3,5-dicarboxylic acid)DFT studyZn(II) complexcrystal structurefluorescence property

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A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks
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Area of Science:

  • Materials Chemistry
  • Coordination Chemistry
  • Crystallography

Background:

  • Coordination polymers offer tunable structures and properties.
  • Developing novel materials with specific architectures is crucial for advanced applications.
  • Metal-organic frameworks (MOFs) and coordination polymers are key research areas.

Purpose of the Study:

  • Synthesize and characterize a new two-dimensional coordination polymer.
  • Investigate the structural assembly and luminescent properties of the synthesized material.
  • Utilize computational methods to validate experimental findings.

Main Methods:

  • Hydrothermal synthesis.
  • Infrared (IR) spectroscopy.
  • Elemental analysis.
  • Thermogravimetric analysis (TGA).
  • X-ray single-crystal and powder diffraction.
  • Density Functional Theory (DFT) calculations.

Main Results:

  • A novel two-dimensional coordination polymer, {[Zn2(pbmpd)(H2O)4]·(H2O)}n, was successfully synthesized.
  • Structural analysis revealed a 2D sheet structure built from zinc(II) ions bridged by 1,1'-(1,4-phenylenebis(methylene))bis-(1H-pyrazole-3,5-dicarboxylic acid) (H4pbmpd).
  • The 2D sheets assemble into a 3D framework through pi-pi stacking interactions and intermolecular hydrogen bonds, exhibiting enhanced solid-state photoluminescence.

Conclusions:

  • The synthesized coordination polymer possesses a unique 2D sheet structure that extends into a 3D framework.
  • The material displays interesting luminescent properties with potential for further investigation.
  • DFT calculations support the experimental structural and electronic properties.