Related Experiment Video
Updated: Jun 15, 2026

Synthetic Methodology for Asymmetric Ferrocene Derived Bio-conjugate Systems via Solid Phase Resin-based Methodology
Published on: March 12, 2015
Conformationally modulated intramolecular electron transfer process in a diaza[2,2]ferrocenophane
Francisco Otón1, Imma Ratera, Arturo Espinosa
1Molecular Nanoscience and Organic Materials Department, Institut de Ciència de Materials de Barcelona (CSIC)/CIBER-BBN, Campus Universitari de Bellaterra, E-08193, Cerdanyola, Spain.
Abstract:
A novel conformationally modulated Intramolecular Electron Transfer (IET) phenomenon has been observed due to the cyclic structure of the diaza[2.2]ferrocenophane 3. The corresponding mixed-valence compound of 3, prepared by electrochemical or chemical partial oxidation, interestingly shows the appearance of two absorption bands in the near infrared (NIR) spectral region. These bands are attributable to two intervalence charge-transfer transitions associated to two atropoisomers exhibiting different energy for the IET process. A solvent and temperature control over the atropoisomeric equilibrium have also been observed. The experimental data and conclusions about both the conformational and the electronic properties of compound 3 are also supported by density functional theory calculations.
Related Concept Videos
Aryldiazonium Salts to Azo Dyes: Diazo Coupling
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry
Thermal Electrocyclic Reactions: Stereochemistry
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.

![Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F60786.jpg&w=3840&q=50)