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Related Concept Videos

Coordination Number and Geometry02:57

Coordination Number and Geometry

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.
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group with both...
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Predicting Molecular Geometry

VSEPR Theory for Determination of Electron Pair Geometries
Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia02:10

Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia

Alkynes can be reduced to trans-alkenes using sodium or lithium in liquid ammonia. The reaction, known as dissolving metal reduction, proceeds with an anti addition of hydrogen across the carbon–carbon triple bond to form the trans product. Since ammonia exists as a gas (bp = −33°C) at room temperature, the reaction is carried out at low temperatures using a mixture of dry ice (sublimes at −78°C) and acetone.
When dissolved in liquid ammonia, an alkali metal, such as sodium, dissociates into a...
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...

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Updated: Jun 1, 2026

Preparation and Evaluation of 99mTc-labeled Tridentate Chelates for Pre-targeting Using Bioorthogonal Chemistry
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Preparation and Evaluation of 99mTc-labeled Tridentate Chelates for Pre-targeting Using Bioorthogonal Chemistry

Published on: February 4, 2017

trans-K(3)[TcO(2)(CN)(4)].

Sayandev Chatterjee, Andrew S Del Negro, Matthew K Edwards

    Acta Crystallographica. Section E, Structure Reports Online
    |May 19, 2011
    PubMed
    Summary
    This summary is machine-generated.

    The structure of tripotassium trans-tetra-cyanidodioxidotechnetate(V) was determined, revealing a distorted octahedral configuration for the technetate anion. This study details the arrangement of oxygen and cyanide ligands around the technetium atom and the positions of potassium cations.

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    Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
    06:35

    Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

    Published on: February 15, 2016

    Area of Science:

    • Inorganic Chemistry
    • Crystallography
    • Coordination Chemistry

    Background:

    • Technetium complexes are of interest due to their diverse applications.
    • Understanding the structural properties of technetium compounds is crucial for their development.
    • Previous studies have characterized related rhenium analogues.

    Purpose of the Study:

    • To elucidate the crystal structure of tripotassium trans-tetra-cyanidodioxidotechnetate(V).
    • To compare the structural features with its rhenium analogue.
    • To analyze the coordination geometry and bonding characteristics of the technetate anion.

    Main Methods:

    • Single-crystal X-ray diffraction was employed to determine the molecular structure.
    • The crystal structure was solved and refined to high accuracy.
    • Interatomic distances and coordination environments were analyzed.

    Main Results:

    • The compound is isotypic with its rhenium analogue.
    • The trans-tetra-cyanido-dioxido-technetate(V) anion ([TcO(2)(CN)(4)](3-)) exhibits a slightly distorted octahedral geometry.
    • The technetium atom is coordinated to two axial oxygen atoms and four equatorial cyanide ligands, with evidence of Tc=O double bond character.
    • Potassium cations occupy distinct crystallographic sites, interacting with oxygen and nitrogen atoms.

    Conclusions:

    • The structural characterization provides fundamental insights into the coordination chemistry of technetium(V).
    • The findings support the presence of significant double-bond character in the Tc-O bonds.
    • The study contributes to the understanding of structure-property relationships in technetate complexes.