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Cationic Group 13/14/15 Element Chain Compounds with Pnictogen-Donor Ligands
Tatiana N Parfeniuk1, Matthias T Ackermann1, Christoph Riesinger1
1Institute of Inorganic Chemistry, University of Regensburg, 93053 Regensburg, Germany.
Inorganic Chemistry
|May 4, 2026
Summary
The reactivity of a germanium-boron compound with N-donor ligands varies, forming adducts or undergoing proton transfer. Bidentate ligands create unique dicationic chains, expanding synthetic possibilities in inorganic chemistry.
Area of Science:
- Organometallic Chemistry
- Inorganic Chemistry
- Materials Science
Background:
- The study focuses on the reactivity of a specific germanium-boron compound, IDipp·GeH2BH2OTf.
- Understanding the coordination behavior of novel germanium complexes is crucial for developing new catalytic and materials applications.
Purpose of the Study:
- To investigate the reactivity of IDipp·GeH2BH2OTf with various monodentate and bidentate ligands.
- To characterize the resulting adducts and dicationic chains using spectroscopic and crystallographic methods.
- To elucidate the mechanistic pathways governing the observed reactivity through DFT calculations.
Main Methods:
- Synthesis and characterization of novel germanium-boron complexes.
- Reactions with monodentate N-donor ligands (e.g., triethyl amine, pyridine, DMAP).
- Reactions with bidentate pnictogen-donor ligands (e.g., bipyridine, dppe).
- Structural analysis via single-crystal X-ray crystallography.
- Spectroscopic characterization using NMR and mass spectrometry.
- Computational studies using Density Functional Theory (DFT).
Main Results:
- Monodentate amines like triethyl amine form cationic adducts, while primary and secondary amines undergo proton transfer, yielding different germanium and boron species.
- Pyridine and DMAP form stable cationic adducts with the germanium-boron core.
- Bidentate ligands (bipyridine, dppe) bridge two IDipp·GeH2BH2+ units, forming unprecedented dicationic chains with novel structural motifs.
- DFT calculations provide insights into the electronic factors driving the observed proton transfer versus adduct formation.
Conclusions:
- The reactivity of IDipp·GeH2BH2OTf is highly dependent on the nature of the N-donor ligand, leading to diverse product formations.
- The formation of dicationic chains represents a significant advancement in constructing complex inorganic architectures.
- The study expands the known coordination chemistry of germanium-boron compounds and highlights their potential for creating novel supramolecular structures.
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