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Formation of Complex Ions

Formation of Complex Ions

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...

Complexation Equilibria: Factors Influencing Stability of Complexes

Complexation Equilibria: Factors Influencing Stability of Complexes

In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...

Assembly of Complex Microtubule Structures

Assembly of Complex Microtubule Structures

Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...

Structural Isomerism

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...

Ionic Crystal Structures

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...

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Related Experiment Video

Updated: Feb 12, 2026

Assembly and Characterization of Polyelectrolyte Complex Micelles

Assembly and Characterization of Polyelectrolyte Complex Micelles

Published on: March 2, 2020

Polyelectrolyte complex films influence the formation of polycrystalline micro-structures.

Elias Nakouzi¹, Hadi M Fares, Joseph B Schlenoff

¹Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32306-4390, USA. steinbck@chem.fsu.edu.

|April 11, 2018

Summary

Researchers explored how polyelectrolyte films influence silica-carbonate biomorph crystallization. Different film chemistries led to distinct structures, including helical and radial patterns, with potential for biomimetic material design.

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Assembly and Characterization of Polyelectrolyte Complex Micelles

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Area of Science:

Materials Science
Biomimetics
Crystallization Science

Background:

Silica-carbonate biomorphs are inorganic materials formed from nanoscale crystalline rods.
These biomorphs self-assemble into complex structures like helices, vessels, and sheets.
Controlling biomorph formation is key to biomimetic material synthesis.

Purpose of the Study:

To investigate the impact of polyelectrolyte complex films on silica-carbonate biomorph crystallization.
To explore how different film chemistries affect the resulting biomorph morphologies.
To assess the potential of polyelectrolyte films as tunable substrates for controlled crystallization.

Main Methods:

Layer-by-layer deposition technique used to prepare polyelectrolyte complex films.
Three stable, chemically distinct films (cationic, anionic, stoichiometric) were created.
Silica-carbonate biomorph crystallization was observed on these prepared substrates.

Main Results:

Cationic substrates (poly(diallyldimethylammonium)-dominated) promoted polycrystalline helical and sheet structures with witherite prisms.
Anionic (poly(styrenesulfonate)-dominated) and stoichiometric substrates induced a different pathway.
Radial mineral film islands grew at a constant velocity of 0.48 μm h-1, eventually covering the entire substrate.

Conclusions:

Polyelectrolyte film chemistry significantly dictates silica-carbonate biomorph morphology.
Tunable crystallization pathways can be achieved using tailored polyelectrolyte substrates.
This research offers new possibilities for biomimetic crystallization using engineered films.