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Related Concept Videos

Radicals: Electronic Structure and Geometry01:07

Radicals: Electronic Structure and Geometry

4.1K
This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
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Coordination Number and Geometry02:57

Coordination Number and Geometry

15.5K
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.
15.5K
Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

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Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
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Valence Bond Theory02:42

Valence Bond Theory

8.9K
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...
8.9K
Structural Isomerism02:34

Structural Isomerism

16.8K
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,...
16.8K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

13.7K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
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Related Experiment Video

Updated: Apr 25, 2026

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates
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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates

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Non-centrosymmetric Rb2Mn2(MoO4)3.

Chahira Bouzidi1, Mohamed Faouzi Zid1, Ahmed Driss1

  • 1Laboratoire de Matériaux et Cristallochimie, Faculté des Sciences de Tunis, Université de Tunis ElManar, 2092 Manar II Tunis, Tunisia.

Acta Crystallographica. Section E, Structure Reports Online
|August 28, 2014
PubMed
Summary
This summary is machine-generated.

Dirubidium dimanganese(II) tris-(tetra-oxo-molyb-date), Rb2Mn2(MoO4)3, was synthesized via solid-state reactions. Its crystal structure features a 3D framework of corner-sharing MnO6 octahedra and MoO4 tetrahedra, with rubidium ions in specific polyhedral cavities.

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Area of Science:

  • Inorganic Chemistry
  • Solid-State Chemistry
  • Crystallography

Background:

  • The synthesis and structural characterization of novel inorganic compounds are crucial for materials science.
  • Molybdates and related compounds often exhibit interesting structural motifs and potential applications.

Purpose of the Study:

  • To synthesize and elucidate the crystal structure of dirubidium dimanganese(II) tris-(tetra-oxo-molyb-date), Rb2Mn2(MoO4)3.
  • To compare the determined structure with related known phases and discuss structural relationships.

Main Methods:

  • Solid-state reaction synthesis.
  • Single-crystal X-ray diffraction for structural determination.
  • Comparative crystallographic analysis.

Main Results:

  • Rb2Mn2(MoO4)3 was successfully prepared via solid-state reactions.
  • The crystal structure consists of a 3D framework built from corner-sharing MnO6 octahedra and MoO4 tetrahedra.
  • Rubidium cations occupy distorted nine- and 12-vertex polyhedra within the framework, with Mn(2+) and Rb(+) cations situated on threefold rotation axes.
  • The compound is isotypic with the Cs2 M 2Mo3O12 (M = Ni, Fe) family.

Conclusions:

  • The detailed crystal structure of Rb2Mn2(MoO4)3 was determined, revealing a unique framework architecture.
  • Structural similarities and differences with related compounds like alluaudite were discussed, providing insights into structure-property relationships in this class of materials.