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Related Concept Videos

Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.
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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride01:26

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Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
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Isomerism in Complexes
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Valence Bond Theory

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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...
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Assembling anionic Sb(V)/(III) containing polyoxostibonates stabilized by triphenyltellurium cations.

Nagarjuna Kumar Srungavruksham1, Viswanathan Baskar

  • 1School of Chemistry, University of Hyderabad, Hyderabad 500046, A.P., India. vbsc@uohyd.ernet.

Dalton Transactions (Cambridge, England : 2003)
|December 6, 2014
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This study reveals novel mixed-valent polyoxostibonates formed from diphenyltellurium oxide reactions. These structures showcase simultaneous Sb(V)/Sb(III) reduction and unique tellurium complexation.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Coordination Chemistry

Background:

  • Organoantimony oxides are key precursors in materials synthesis.
  • Polyoxometalates (POMs) exhibit diverse structures and properties.
  • Tellurium-containing compounds offer unique coordination capabilities.

Purpose of the Study:

  • To investigate reactions between diphenyltellurium oxide and organoantimony compounds.
  • To characterize novel polyoxostibonate structures.
  • To understand the simultaneous processes during POM assembly.

Main Methods:

  • Single crystal X-ray diffraction for structural elucidation.
  • Solution 125Te NMR spectroscopy for structural support.
  • Chemical synthesis and characterization of novel compounds.

Main Results:

  • Formation of rare mixed-valent Sb(V)/Sb(III) polyoxostibonates.
  • Structural determination of complex POMs incorporating tellurium moieties.
  • Observation of simultaneous Sb(V) to Sb(III) reduction and dearylation.
  • Identification of tetraorganoditelluroxane stabilizing POMs and triphenyltellurium cations providing charge balance.

Conclusions:

  • Diphenyltellurium oxide is a versatile reagent for synthesizing complex POMs.
  • The study highlights unprecedented simultaneous reaction pathways in POM formation.
  • Novel POM structures demonstrate the stabilizing role of tellurium species.