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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Cationic Chain-Growth Polymerization: Mechanism00:57

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Aromatic Hydrocarbon Anions: Structural Overview01:18

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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Valence Bond Theory02:42

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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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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A two-dimensional anionic CdII polymer constructed through dicyanamide coordination bridges.

Hui-Ting Wang1, Lin Zhou1, Xiao-Li Wang1

  • 1College of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, People's Republic of China.

Acta Crystallographica. Section C, Structural Chemistry
|August 6, 2015
PubMed
Summary

Researchers synthesized a new cadmium dicyanamide complex, a 2D coordination polymer with potential ferroelectric properties. This material features cadmium(II) ions bridged by dicyanamide ligands, forming a robust supramolecular network.

Keywords:
cadmium(II) complexcrystal engineeringcrystal structuredicyanamideferroelectric materialphase-transition materialtwo-dimensional coordination polymer

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Crystallography

Background:

  • Molecular-based coordination compounds are explored for ferroelectric properties.
  • Cadmium(II) organic-inorganic compounds exhibit temperature-induced phase transitions.

Purpose of the Study:

  • Synthesize and characterize a novel cadmium dicyanamide complex.
  • Investigate the structural and potential ferroelectric properties of the new compound.

Main Methods:

  • Hydrothermal synthesis of the cadmium dicyanamide complex.
  • Single-crystal X-ray diffraction analysis to determine the crystal structure.
  • Analysis of coordination environment and network dimensionality.

Main Results:

  • A new 2D coordination polymer, {(C9H15N2)[Cd(C2N3)3]}n, was successfully synthesized.
  • The crystal structure reveals Cd(II) cations coordinated by six dicyanamide (dca) ligands, forming a 2D network.
  • Organic cations (4-dimethylamino-1-ethylpyridin-1-ium) are non-coordinating and reside within the supramolecular framework.

Conclusions:

  • The synthesized compound represents a novel cadmium dicyanamide coordination polymer.
  • The 2D structure, with octahedrally coordinated Cd(II) and bridging dca ligands, provides a foundation for exploring ferroelectric behavior.
  • The non-involvement of organic cations in the network suggests potential for tuning properties through cation modification.