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Related Concept Videos

Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

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...
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Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
Formation of Complex Ions03:45

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...
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...
Stereoisomerism02:52

Stereoisomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Precipitation Titration Curve: Analysis01:21

Precipitation Titration Curve: Analysis

The precipitation titration curve demonstrates the change in concentration of one reactant with the volume of titrant added. During the titration of chloride ions with silver nitrate, the precipitation titration curve is divided into three regions: before, at, and after the equivalence point. Before the equivalence point, low redissolution of the sparingly soluble silver chloride precipitate gives a low silver ion concentration. However, in the second region, representing the equivalence point,...

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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)
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Poly[[μ(2)-acetato-aquadi-μ(3)-isonicotinato-holmium(III)silver(I)] perchlorate].

Sun Feng1

  • 1School of Chemistry and Environment, South China Normal University, Guangzhou 510631, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online
|May 18, 2011
PubMed
Summary

This study details a novel 3D heterometallic complex, {[AgHo(isonicotinate)2(acetate)(H2O)]ClO4}n, featuring silver and holmium ions. The complex forms a stable 3D network through bridging ligands and hydrogen bonding.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Crystallography

Background:

  • Heterometallic complexes offer unique structural and functional properties.
  • The synthesis of 3D coordination networks is crucial for developing advanced materials.

Purpose of the Study:

  • To synthesize and characterize a novel three-dimensional heterometallic complex containing silver (Ag(I)) and holmium (Ho(III)) ions.
  • To elucidate the coordination environment of the metal ions and the structural features of the resulting network.

Main Methods:

  • Single-crystal X-ray diffraction was employed to determine the crystal structure.
  • Analysis of coordination modes of isonicotinate and acetate ligands.
  • Identification of hydrogen bonding interactions stabilizing the crystal lattice.

Main Results:

  • A 3D heterometallic framework, {[AgHo(isonicotinate)2(acetate)(H2O)]ClO4}n, was successfully synthesized.
  • Ho(III) is eight-coordinated, while Ag(I) is two-coordinated, linked by bridging ligands.
  • The structure is stabilized by extensive O-H⋯O hydrogen bonding and exhibits disorder in perchlorate and acetate groups.

Conclusions:

  • The study presents a new 3D heterometallic coordination polymer with interesting structural features.
  • The bridging capabilities of isonicotinate and acetate ligands are key to forming the extended network.
  • Hydrogen bonding plays a significant role in the overall crystal structure stabilization.