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Related Concept Videos

Nucleophilic Substitution14:21

Nucleophilic Substitution

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Source: Vy M. Dong and Daniel Kim, Department of Chemistry, University of California, Irvine, CA
Nucleophilic substitution reactions are among the most fundamental topics covered in organic chemistry. A nucleophilic substitution reaction is one where a nucleophile (electron-rich Lewis base) replaces a leaving group from a carbon atom.
SN1 (S = Substitution, N = Nucleophilic, 1 = first-order kinetics)
SN2 (S = Substitution, N = Nucleophilic, 2 = second-order kinetics)
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Visual masking is a term used by perceptual scientists to refer to a wide range of phenomena in which in an image is presented but not perceived by an observer because of the presentation of a second image. There are several different kinds of masking, many of them relatively intuitive and unsurprising. But one surprising and important type of masking is called Object Substitution Masking. It has been a focus of research in...
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Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

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Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
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A protocol for the preparation of poly(pentafluorophenyl acrylate) (poly(PFPA)) grafted silica beads is presented. The poly(PFPA) functionalized surface is then immobilized with antibodies and used successfully for the protein separation through...
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Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

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This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
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Nucleophilic Substitution Reactions02:34

Nucleophilic Substitution Reactions

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Historical perspective
In 1896, the German chemist Paul Walden discovered that he could interconvert pure enantiomeric (+) and (-) malic acids through a series of reactions. This conversion suggested the involvement of optical inversion during the substitution reaction. Further, in 1930, Sir Christopher Ingold described for the first time two different forms of nucleophilic substitution reactions, which are known as SN1 (nucleophilic substitution unimolecular) and SN2 (nucleophilic substitution...
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Nucleophilic Substitution: SN1 and SN2 Reactions
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Nucleophilic Substitution: SN1 and SN2 Reactions

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A new octa-Mn-substituted poly(polyoxotungstate).

Hai-Lou Li1, Chen Lian1, Da-Peng Yin1

  • 1MOE Key Laboratory of Cluster Science, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China. ygy@bit.edu.cn.

Dalton Transactions (Cambridge, England : 2003)
|August 31, 2019
PubMed
Summary
This summary is machine-generated.

A novel octa-manganese-substituted silicotungstate cluster was synthesized using hydrothermal reactions. This tetrameric cluster exhibits unique structural and magnetic properties, offering new avenues in materials science.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Silicotungstates are versatile polyoxometalates with diverse applications.
  • Manganese substitution in silicotungstates can tune their properties.
  • Hydrothermal synthesis offers a controlled environment for creating complex inorganic structures.

Purpose of the Study:

  • To synthesize and characterize a novel octa-manganese-substituted silicotungstate.
  • To investigate the structural, electrochemical, thermal, and magnetic properties of the new compound.
  • To explore the potential of manganese cations in modifying silicotungstate frameworks.

Main Methods:

  • Hydrothermal reaction utilizing trivacant [A-α-SiW9O34]10- building blocks with Mn2+ and Mn7+.
  • Systematic characterization using IR spectroscopy, elemental analysis, thermogravimetric analysis (TGA), powder X-ray diffraction (PXRD), and single crystal X-ray diffraction.
  • Electrochemical, thermal stability, and magnetic property studies.

Main Results:

  • Successful synthesis of a novel tetrameric octa-manganese-substituted silicotungstate, [H2N(CH3)2]8H19Na4{[K(H2O)4WO4][SiMnW10O38]3}[SiMnW10O38]·27H2O (1).
  • The structure features a tetrameric cluster formed by a cyclic trimeric unit and a {SiMnW10O38} fragment linked by W-O-MnIII bridges.
  • Detailed characterization confirmed the proposed structure and provided insights into its properties.

Conclusions:

  • The novel octa-manganese-substituted silicotungstate represents a new structural motif in polyoxometalate chemistry.
  • The compound exhibits interesting electrochemical, thermal, and magnetic behaviors.
  • This research expands the library of manganese-substituted silicotungstates and highlights their potential for advanced applications.