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Related Concept Videos

Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
Ionic Crystal Structures02:42

Ionic Crystal Structures

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...
Valence Bond Theory02:42

Valence Bond Theory

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...
Alkyl Halides02:45

Alkyl Halides

Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene01:13

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Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
Coordination Number and Geometry02:57

Coordination Number and Geometry

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.

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Bis(4-fluoro-anilinium) tetra-chloridocuprate(II).

Min Min Zhao1, Ping Ping Shi

  • 1Ordered Matter Science Research Center, College of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online
|May 18, 2011
PubMed
Summary

The crystal structure of (4-fluoro-anilinium)2[CuCl4] reveals 2D perovskite layers. These layers are connected by hydrogen bonds, forming highly distorted copper(II) chloride octahedra due to Jahn-Teller effects.

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Area of Science:

  • Crystal engineering
  • Materials science
  • Solid-state chemistry

Background:

  • Perovskite structures are known for their diverse applications.
  • Jahn-Teller distortion significantly impacts the properties of transition metal compounds.
  • Understanding the interplay between organic cations and inorganic layers is crucial for designing novel materials.

Purpose of the Study:

  • To elucidate the crystal structure of the novel compound (C(6)H(7)FN)(2)[CuCl(4)].
  • To investigate the structural features, including dimensionality and bonding.
  • To analyze the coordination geometry and distortion of the copper chloride octahedra.

Main Methods:

  • Single-crystal X-ray diffraction was employed to determine the atomic arrangement.
  • Structural analysis focused on identifying coordination polyhedra and intermolecular interactions.
  • Bond lengths and angles were precisely measured to quantify distortions.

Main Results:

  • The compound exhibits a two-dimensional perovskite-type layered structure.
  • Corner-sharing CuCl(6) octahedra form the inorganic layers.
  • 4-fluoro-anilinium cations bridge these layers via N-H⋯Cl hydrogen bonds, leading to significant Jahn-Teller distortion in the CuCl(6) octahedra.

Conclusions:

  • The crystal structure is characterized by 2D perovskite layers and hydrogen-bonded organic chains.
  • The observed Jahn-Teller distortion highlights the influence of electronic configuration on the geometry of CuCl(6) octahedra.
  • This structural motif provides insights into the design of functional materials based on layered perovskites.