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INGO DAUSTER, COREY A. RICE AND MARTIN A. SUHM, Institut für Physikalische Chemie, Universität Göttingen, Tammannstr. 6, D-37077 Göttingen, Germany.
Jet-FTIR spectroscopy is a powerful technique to investigate small hydrogen bonded clusters. The filet-jet-spectrometer combines a 600×0.2 mm\textsuperscript2 slit nozzle with a commercial FTIR-instrument.
Pyrrole is a five-membered heterocyclic aromat with hydrogen bond donor (N--H) and acceptor (
-system) functionalities. Weak N--H
hydrogen bonds\footnoteA.~Gómez-Zavagalia and R.~Fausto J.~Phys.~Chem.~A \textbf108, 2004, 6953--6967. play an important role in biological systems. Therefore, weakly bound aggregates of pyrrole and some of its methylated derivatives have been systematically characterised by the filet-jet-spectroscopy.
In pyrrole-2-carboxaldehyde, the additional carbonyl group offers a better hydrogen bond acceptor site and leads to the formation of more conventional N--H
O hydrogen bonds. Its dimer has therefore been investigated as a small model system for hydrogen bonding in peptides.