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Related Concept Videos

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.
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Minerals are essential nutrients that the human body needs in small amounts to work properly. They play a vital role in many bodily functions, such as building strong bones and transmitting nerve impulses. Some minerals are needed for hormone production or to maintain a normal heartbeat. Major minerals include calcium, phosphorus, potassium, sulfur, sodium, chlorine, and magnesium, while trace minerals include iron, manganese, copper, iodine, zinc, cobalt, fluoride, and selenium.
 
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Gravimetry: Inorganic And Organic Precipitating Agents00:49

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In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
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Complexation Equilibria: Overview01:23

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Complexation reactions take place when dative or coordinate covalent bonds form between metal ions and ligands. The compounds formed in these reactions are called coordination compounds. The number of bonds formed between the metal ion and the ligands is called its coordination number. Generally, most metal ions in an aqueous solution are solvated by water molecules and thus exist as aqua complexes.
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Mass Spectrometry: Complex Analysis01:21

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Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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The Fedorov-Groth law revisited: complexity analysis using mineralogical data.

Sergey V Krivovichev1, Vladimir G Krivovichev2

  • 1Department of Crystallography, Institute of Earth Sciences, St Petersburg State University, University Emb. 7/9, St Petersburg, 199034, Russian Federation.

Acta Crystallographica. Section A, Foundations and Advances
|May 2, 2020
PubMed
Summary

The Fedorov-Groth law states that simpler chemical compounds have higher symmetry. Mineral data confirms this law, showing a link between chemical information per atom and mineral point group symmetry.

Keywords:
Fedorov–Groth lawShannon informationchemical compositioncomplexitysymmetry

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Area of Science:

  • Crystallography
  • Chemical Physics
  • Mineralogy

Background:

  • The Fedorov-Groth law posits an inverse relationship between chemical simplicity and symmetry.
  • Previous studies have explored this relationship, but quantitative validation using mineralogical data was lacking.

Purpose of the Study:

  • To statistically validate the Fedorov-Groth law using a comprehensive mineralogical dataset.
  • To quantitatively assess the correlation between chemical complexity and crystallographic symmetry in minerals.

Main Methods:

  • Utilized a mineralogical database containing chemical composition and crystallographic information.
  • Quantified chemical complexity using Shannon chemical information per atom.
  • Measured crystallographic symmetry using the order of the mineral's point group.

Main Results:

  • Demonstrated a statistically significant inverse correlation between chemical complexity (Shannon information per atom) and crystallographic symmetry (point group order).
  • The Fedorov-Groth law was found to be valid and statistically meaningful for minerals.

Conclusions:

  • Chemical complexity, quantified by Shannon information, is a reliable predictor of crystallographic symmetry in minerals.
  • The findings support the Fedorov-Groth law, highlighting a fundamental principle governing the structure of chemical compounds.