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Related Concept Videos

Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent – the...
Crossing Over01:34

Crossing Over

Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
Crossing Over01:30

Crossing Over

Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I, duplicated...
Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...

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Related Experiment Video

Updated: Jun 6, 2026

Optimizing the Growth of Endothiapepsin Crystals for Serial Crystallography Experiments
09:52

Optimizing the Growth of Endothiapepsin Crystals for Serial Crystallography Experiments

Published on: February 4, 2021

Making spin-crossover crystals by successive polymorphic transformations.

Rong-Jia Wei1, Bao Li, Jun Tao

  • 1State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China.

Inorganic Chemistry
|December 9, 2010
PubMed
Summary
This summary is machine-generated.

The iron complex [Fe(tpa)(NCS)(2)] underwent polymorphic transformations, yielding new crystal forms with altered color, structure, and spin-crossover properties.

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Last Updated: Jun 6, 2026

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Coordination Chemistry

Background:

  • Polymorphism is crucial in materials science, affecting physical properties.
  • Spin-crossover (SCO) complexes exhibit switchable magnetic properties.
  • [Fe(tpa)(NCS)(2)] is a SCO complex with potential applications.

Purpose of the Study:

  • To investigate the polymorphic transformations of [Fe(tpa)(NCS)(2)].
  • To characterize the structural and spin-crossover properties of the resulting polymorphs.

Main Methods:

  • Crystallization and single-crystal X-ray diffraction.
  • Variable-temperature magnetic susceptibility measurements.
  • Colorimetric analysis.

Main Results:

  • Successive polymorphic transformations (polymorphs II-IV) were observed.
  • Distinct changes in crystal structure and color were identified for each polymorph.
  • Significant alterations in spin-crossover behavior were correlated with structural changes.

Conclusions:

  • The [Fe(tpa)(NCS)(2)] complex exhibits rich polymorphism.
  • Polymorphic transformations critically influence the spin-crossover properties.
  • Understanding these transformations is key for designing functional SCO materials.