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

Research output: Contribution to journalArticle

Abstract

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
Volume56
Issue number11
DOIs
Publication statusPublished - 2017

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