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Related Concept Videos

Periodic Classification of the Elements04:00

Periodic Classification of the Elements

The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
Metallic Solids02:37

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
Valence Bond Theory02:42

Valence Bond Theory

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...
Newman Projections02:06

Newman Projections

Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.
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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Updated: Jul 6, 2026

Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules
08:40

Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules

Published on: April 28, 2014

A propeller-like uranyl metallomesogen.

Thomas Cardinaels1, Jan Ramaekers, Daniel Guillon

  • 1Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium.

Journal of the American Chemical Society
|December 15, 2005
PubMed
Summary
This summary is machine-generated.

Uranyl triflate and a phenanthroline ligand form a propeller-like complex inducing a hexagonal columnar mesophase. This complex exhibits unique liquid-crystalline properties not present in the ligand alone.

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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Crystallography

Background:

  • Imidazo[4,5-f]-1,10-phenanthroline ligands are known for their coordination properties.
  • Uranyl salts are frequently used in coordination chemistry.
  • Liquid-crystalline phases are of interest for advanced materials applications.

Purpose of the Study:

  • To synthesize and characterize a novel uranyl complex with imidazo[4,5-f]-1,10-phenanthroline.
  • To investigate the liquid-crystalline properties of the resulting complex.
  • To understand the structural basis for the observed mesophase.

Main Methods:

  • Complex formation between uranyl triflate and the phenanthroline ligand.
  • Polarizing optical microscopy for mesophase observation.
  • High-temperature X-ray diffraction for structural analysis.

Main Results:

  • A propeller-like uranyl complex was successfully synthesized.
  • The complex exhibits a hexagonal columnar mesophase.
  • The mesophase is induced by complex formation, not present in the free ligand.
  • A molecular stacking model for the mesophase was proposed.

Conclusions:

  • Uranyl complexation with imidazo[4,5-f]-1,10-phenanthroline induces a hexagonal columnar liquid-crystalline phase.
  • The ligand's structure is crucial for mesophase formation upon complexation.
  • The study provides insights into structure-property relationships in coordination-based liquid crystals.