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Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

21.6K
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...
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Structural Isomerism02:34

Structural Isomerism

19.4K
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, SCN− can...
19.4K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

21.0K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
21.0K
Redox Titration: Other Oxidizing and Reducing Agents01:26

Redox Titration: Other Oxidizing and Reducing Agents

333
Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
333
Properties of Transition Metals02:58

Properties of Transition Metals

26.2K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
26.2K
Rate-Determining Steps03:08

Rate-Determining Steps

32.7K
Relating Reaction Mechanisms
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
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Nitridochromate(IV): LiSr2[CrN3].

Natalia Gloriozova1, Yurii Prots1, Franziska Jach1,2

  • 1Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany.

Inorganic Chemistry
|August 3, 2023
PubMed
Summary
This summary is machine-generated.

Researchers discovered a new quaternary nitridochromate(IV) compound, LiSr2[CrN3], exhibiting a novel crystal structure. This material shows semiconductor properties with a 1.19 eV band gap, suggesting potential electronic applications.

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Area of Science:

  • Solid-state chemistry
  • Inorganic materials science
  • Crystallography

Background:

  • Nitridochromates are an important class of inorganic compounds with diverse structural and electronic properties.
  • Understanding the synthesis and characterization of novel nitridochromates is crucial for exploring new materials.
  • Previous studies have focused on nitridochromates(III), but nitridochromates(IV) remain less explored.

Purpose of the Study:

  • To synthesize and characterize a new quaternary nitridochromate(IV) compound.
  • To determine the crystal structure and bonding of the novel compound.
  • To investigate the electronic properties and potential applications of the synthesized material.

Main Methods:

  • Single-crystal X-ray diffraction for structural determination.
  • Elemental analysis and vibrational spectroscopy for chemical characterization.
  • Electronic structure calculations (e.g., DFT) to determine band gap and electronic behavior.

Main Results:

  • The quaternary nitridochromate(IV) LiSr2[CrN3] was successfully synthesized and crystallizes in a new structure type within the non-centrosymmetric space group P21.
  • Structural analysis revealed trigonal [CrN3]5- units connected by lithium, forming slabs.
  • Experimental data (Cr-N bond lengths, diamagnetism, spectroscopy) and electronic structure calculations (1.19 eV band gap) confirm the Cr(IV) oxidation state and semiconductor nature.

Conclusions:

  • LiSr2[CrN3] represents a novel quaternary nitridochromate(IV) with a unique crystal structure.
  • The compound exhibits semiconductor properties, indicating potential for applications in electronics.
  • Further research into nitridochromates(IV) could lead to the discovery of materials with tailored electronic functionalities.