Wavelength-dependent reactivity of germanium-based photoinitiators
Max Schmallegger1, Dmytro Neshchadin1, Hilde Freißmuth1
1Institute of Physical and Theoretical Chemistry, Graz University of Technology, Graz, Austria.
Abstract:
This study investigates the wavelength-dependent reactivity of the three germanium-based type I photoinitiators bis(4-methoxybenzoyl)diethylgermane (Ivocerin®), tris(2,4,6-trimethylbenzoyl)ethylgermane, and tetrakis(2-methylbenzoyl)germane. By systematically varying LED wavelengths from 365 to 495 nm, we quantify quantum efficiencies/absorbance and correlate them with the photobleaching behavior and penetration depths. The results highlight the crucial relationship between the emission profile of the light source and the efficiency of the photoinitiators. These insights are particularly relevant for optimizing light-driven processes in applications such as biomedical printing, adhesives, and spatially controlled polymerization.
Supplementary Information:
The online version contains supplementary material available at 10.1007/s00706-025-03379-5.
More Related Videos
Related Concept Videos
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation
Cycloaddition Reactions: MO Requirements for Photochemical Activation
ortho–para-Directing Deactivators: Halogens


