Related Experiment Video
Updated: Jun 30, 2026

Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
Published on: May 28, 2014
Realization of SOMO-HOMO level conversion for a TEMPO-dithiolate ligand by coordination to platinum(II)
Tetsuro Kusamoto1, Shoko Kume, Hiroshi Nishihara
1Department of Chemistry, Graduate School of Science, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Abstract:
We developed a TEMPO-bound dithiolate ligand (= tempodt) and its Pt(diimine)(dithiolate) complex to realize a unique electronic structure with the potential for unprecedented functionalities. The physical properties and electronic structures of tempodt, (tempodt)Pt, and their related compounds were investigated by cyclic voltammetry, UV-visible spectroscopy, electron spin resonance (ESR) spectroscopy, and other techniques. It was revealed that (tempodt)Pt showed an unusual electronic structure in which the HOMO level (= pi-conjugated dithiolate-based orbital) was located above the SOMO level attributed to the TEMPO moiety, and that this situation was achieved via a drastic electronic structure change of SOMO-HOMO level conversion through complex formation. These findings were further supported by an investigation into a one-electron oxidized (tempodt)Pt and related complexes.
More Related Videos
12:08Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
Published on: June 24, 2022
10:51The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
Published on: April 10, 2015
Related Concept Videos
Metal-Ligand Bonds
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...
Stereoisomerism
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...
Complexometric Titration: Ligands
Valence Bond Theory
Structural Isomerism
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Complexation Equilibria: The Chelate Effect