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In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
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Complexation reactions take place when dative or coordinate covalent bonds form between metal ions and ligands. The compounds formed in these reactions are called coordination compounds. The number of bonds formed between the metal ion and the ligands is called its coordination number. Generally, most metal ions in an aqueous solution are solvated by water molecules and thus exist as aqua complexes.
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Assembly and Characterization of Polyelectrolyte Complex Micelles
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Organic-inorganic macroion coacervate complexation.

Benxin Jing1, Jie Qiu, Yingxi Zhu

  • 1Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, Michigan 48202, USA. yzhu3@wayne.edu.

Soft Matter
|June 21, 2017
PubMed
Summary
This summary is machine-generated.

Zwitterionic polymers and polyoxometalate polyanions form coacervate complexes through entropy-driven ion pairing. This discovery expands coacervate formation beyond charged polymers, enabling new hybrid materials for catalysis and nanomedicine.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Polymer Chemistry

Background:

  • Coacervate complexes are liquid-liquid separated materials formed by mixing oppositely charged polyelectrolytes in aqueous solutions.
  • Entropy-driven ion pairing, due to counterion release, is the established mechanism for coacervate formation between conventional polyelectrolytes like proteins and DNA.

Purpose of the Study:

  • To investigate coacervate complex formation between zwitterionic poly(sulfobetaine methacrylate) (PSBMA) and inorganic polyoxometalate (POM) polyanions.
  • To explore the conditions and mechanisms governing coacervation with neutral zwitterionic polymers and multivalent inorganic nanomaterials.

Main Methods:

  • Mixing of PSBMA and POM polyanions in LiCl aqueous solutions.
  • Analysis of coacervate composition through supernatant and dense phase examination.
  • Measurement of supernatant conductivity and macroion charge to infer binding interactions.

Main Results:

  • Biphasic liquid-like coacervate complexes formed over a wide range of POM-to-PSBMA ratios and LiCl concentrations.
  • PSBMA and POM macroions concentrated in the dense coacervate phase, while LiCl remained in the supernatant.
  • Evidence indicated stronger binding between PSBMA and POM anions than Cl-, driving coacervate formation.

Conclusions:

  • Demonstrated the generality of ion-pairing induced coacervate complexation using net neutral zwitterionic polymers and multivalent inorganic nanomaterials.
  • The organic-inorganic macroion complexation offers insights into natural supramolecular assemblies.
  • Paved the way for developing novel hybrid macroionic materials for applications in green catalysis and nanomedicine.