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Related Concept Videos

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...
π Molecular Orbitals of the Allyl Cation and Anion01:18

π Molecular Orbitals of the Allyl Cation and Anion

An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with an...
Structural Isomerism02:34

Structural Isomerism

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 be...
Stereoisomerism02:52

Stereoisomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.

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Discovery and Synthesis Optimization of Isoreticular Al(III) Phosphonate-Based Metal-Organic Framework Compounds Using High-Throughput Methods
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Allyl strontium compounds: synthesis, molecular structure and properties.

Phillip Jochmann1, Julien P Davin, Stefanie Maslek

  • 1Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, D-52056 Aachen, Germany.

Dalton Transactions (Cambridge, England : 2003)
|June 14, 2012
PubMed
Summary

Researchers synthesized potassium tris(allyl)strontiate, a novel strontium complex, from bis(allyl)strontium precursors. This ate complex exhibits a unique 2D network structure and influences polymerisation reactions.

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Strontium complexes are of interest for their diverse chemical properties.
  • Allyl ligands offer unique bonding and reactivity in organometallic compounds.
  • Understanding the synthesis and structure of early transition metal complexes is crucial.

Purpose of the Study:

  • To synthesize and characterize novel neutral and anionic allylstrontium complexes.
  • To investigate the solid-state structure and bonding of these complexes.
  • To explore the reactivity and catalytic potential of the synthesized strontium compounds.

Main Methods:

  • Synthesis of allylstrontium complexes using strontium iodide, [Sr(TMDS)2], and [Sr(HMDS)2] precursors.
  • X-ray single crystal diffraction for structural elucidation of complexes and precursors.
  • Nuclear Magnetic Resonance (NMR) spectroscopy to analyze bonding and electronic properties.

Main Results:

  • Isolation of potassium tris(allyl)strontiate K[Sr(C3H5)3] (2) instead of the target neutral bis(allyl)strontium.
  • Determination of the salt-like, 2D network structure of 2·(THF)3 with bridged potassium and strontium centers.
  • Characterization of [Sr(TMDS)2] (3) as a dissymmetric dimer [Sr2(TMDS)4(THF)3] (3·(THF)3) with Si-HSr agostic interactions.
  • Observation of Brønsted basicity in in situ generated bis(allyl)strontium, inducing THF polymerization.

Conclusions:

  • The synthesis of allylstrontium complexes yielded an unexpected ate complex with a unique structural motif.
  • The solid-state structure reveals complex bridging interactions between potassium and strontium.
  • The reactivity studies indicate potential for these complexes in polymerization catalysis.