Tetraacylgermanes: Highly Efficient Photoinitiators for Visible-Light-Induced Free-Radical Polymerization

Judith Radebner, Anna Eibel, Mario Leypold, Christian Gorsche, Lukas Schuh, Roland Fischer, Ana Torvisco, Dmytro Neshchadin, Roman Geier, Norbert Moszner, Robert Liska, Georg Gescheidt, Michael Haas, Harald Stüger

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In this contribution a convenient synthetic method to obtain tetraacylgermanes Ge[C(O)R]4 (R=mesityl (1 a), phenyl (1 b)), a previously unknown class of highly efficient Ge-based photoinitiators, is described. Tetraacylgermanes are easily accessible via a one-pot synthetic protocol in >85 % yield, as confirmed by NMR spectroscopy, mass spectrometry, and X-ray crystallography. The efficiency of 1 a,b as photoinitiators is demonstrated in photobleaching (UV/Vis), time-resolved EPR (CIDEP), and NMR/CIDNP investigations as well as by photo-DSC studies. Remarkably, the tetraacylgermanes exceed the performance of currently known long-wavelength visible-light photoinitiators for free-radical polymerization.

Original languageEnglish
Pages (from-to)3103-3107
Number of pages5
JournalAngewandte Chemie - International Edition
Issue number11
Publication statusPublished - 2017

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