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Related Concept Videos

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

25.6K
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...
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Valence Bond Theory02:42

Valence Bond Theory

11.7K
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...
11.7K
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

2.6K
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
2.6K
Coordination Number and Geometry02:57

Coordination Number and Geometry

19.8K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
19.8K
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

28.2K
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
28.2K
Ionic Crystal Structures02:42

Ionic Crystal Structures

20.7K
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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Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications
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Surface-Supported Robust 2D Lanthanide-Carboxylate Coordination Networks.

José I Urgel1, Borja Cirera2, Yang Wang2,3

  • 1Physik Department E20, Technische Universität München, 85748, Garching, Germany.

Small (Weinheim an Der Bergstrasse, Germany)
|November 3, 2015
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Researchers fabricated interfacial 2D lanthanide-carboxylate networks for advanced applications. These robust, low-dimensional metallosupramolecular systems exhibit promising electronic properties and thermal stability.

Keywords:
coordination networks, self-assemblylanthanidesmetal-organic coordination networkssurface coordination chemistry

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Surface Science

Background:

  • Lanthanide-based metal-organic compounds are versatile for sensing, catalysis, photoluminescence, and magnetism.
  • Developing ordered, low-dimensional lanthanide systems is crucial for tailored functionalities.

Purpose of the Study:

  • To fabricate and characterize interfacial two-dimensional (2D) lanthanide-carboxylate networks.
  • To investigate the electronic properties and bonding characteristics of these novel systems.

Main Methods:

  • Low- and variable-temperature scanning tunneling microscopy (STM) for structural analysis.
  • X-ray photoemission spectroscopy (XPS) for electronic structure elucidation.
  • Density functional theory (DFT) calculations for theoretical validation.

Main Results:

  • Successful fabrication of extended nanoporous grids of lanthanide-carboxylate networks on a Cu(111) surface.
  • Identification of mononuclear nodes with eightfold lateral coordination.
  • XPS and DFT confirmed ionic bonding characteristics with significant thermal stability.

Conclusions:

  • Introduced a new generation of robust, low-dimensional metallosupramolecular systems.
  • Demonstrated the potential of interfacial 2D lanthanide networks for advanced material applications.
  • Highlighted the integration of f-block element functionalities into designed architectures.