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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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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Crystal Growth: Principles of Crystallization01:25

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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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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,...
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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Related Experiment Video

Updated: Dec 11, 2025

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Understanding colossal barocaloric effects in plastic crystals.

F B Li1, M Li1, X Xu1

  • 1School of Physics and Electronics, Hunan Key Laboratory of Super Microstructure and Ultrafast Process, State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China.

Nature Communications
|August 23, 2020
PubMed
Summary
This summary is machine-generated.

Neopentylglycol (NPG) shows large barocaloric effects (BCEs) for solid-state cooling. Hydrogen bonds in NPG influence molecular order, and pressure can tune this transition for better cooling materials.

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Solid-State Physics

Background:

  • Neopentylglycol (NPG) is a plastic crystal known for colossal barocaloric effects (BCEs).
  • BCEs offer a promising route for solid-state cooling applications using external pressure.
  • Understanding the molecular mechanisms behind NPG's BCEs is crucial for developing advanced cooling materials.

Purpose of the Study:

  • To investigate the role of intermolecular hydrogen bonds in the orientational order-disorder transitions of NPG.
  • To elucidate the atomic-scale mechanisms governing the colossal barocaloric effects in NPG.
  • To explore pressure-induced tuning of intermolecular interactions for optimizing BCEs.

Main Methods:

  • Analysis of hydrogen bond strength and its influence on molecular ordering.
  • Calculation of rotational entropy free energy and entropy changes.
  • Investigation of pressure effects on hydrogen bond length and activation barriers.

Main Results:

  • Intermolecular hydrogen bonds are key to NPG's orientational order.
  • Thermal perturbation weakens the activation barrier for orientational disorder.
  • External pressure reduces hydrogen bond length and enhances the activation barrier, tuning the order-disorder transition.

Conclusions:

  • The study provides atomic-scale insights into NPG's order-disorder transitions and BCEs.
  • Hydrogen bond dynamics are critical for understanding and optimizing barocaloric effects in plastic crystals.
  • This research facilitates the molecular design of superior caloric materials for future cooling technologies.