Related Experiment Video
Updated: Aug 13, 2026

Iridium(III) Luminescent Probe for Detection of the Malarial Protein Biomarker Histidine Rich Protein-II
Published on: July 7, 2015
Interaction of I(-) and I(3)(-) with a redox-stable Cr(III)-based structural surrogate for photo-oxidized "N3 Dye"
1Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA.
Abstract:
A series of [Cr (L)(2)(NCS)(2)]X complexes, where L = 2,2'-bipyridine (bpy) or 4,4'-dimethyl-2,2'-bipyridine (dmb) and X(-) is I(-), I(3)(-), or NO(3)(-), have been prepared for study as redox-inactive surrogates for diisothiocyanatobis(2,2'-bipyridine-4,4'-dicarboxylic acid)ruthenium(III) ("N3(+)"). Dilute solution spectra in dichloromethane or acetonitrile of the I(-) and NO(3)(-) salts are the same, but the I(-) salts show clear evidence of a charge-transfer interaction between the cation and anion in the solid state and in concentrated I(-) solutions in acetonitrile. X-ray structural determination of the dmb complex shows that this interaction is between the I(-) and one of the dmb ligands. X-ray structural determination of the bpy complex as the I(3)(-) salt indicates a similar interaction between one of the bpy ligands and one of the terminal iodine atoms of the anion. These results have potential implications in the reduction mechanism of photo-oxidized N3 dye used as a sensitizer in nanocrystalline TiO(2)-based photogalvanic cells.
More Related Videos
Related Concept Videos
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...
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation
Electron Transport Chain: Complex III and IV
Cycloaddition Reactions: MO Requirements for Photochemical Activation
Redox Titration: Iodimetry and Iodometry
Redox Titration: Other Oxidizing and Reducing Agents

