Cyran Jenée D, Backus Ellen H G, van Zadel Marc-Jan, Bonn Mischa
Molecular Spectroscopy Department, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.
Department of Physical Chemistry, University of Vienna, Währinger Strasse 42, 1090, Vienna, Austria.
Angew Chem Int Ed Engl. 2019 Mar 11;58(11):3620-3624. doi: 10.1002/anie.201813517. Epub 2019 Feb 8.
Small organic molecules on ice and water surfaces are ubiquitous in nature and play a crucial role in many environmentally relevant processes. Herein, we combine surface-specific vibrational spectroscopy and a controllable flow cell apparatus to investigate the molecular adsorption of acetone onto the basal plane of single-crystalline hexagonal ice with a large surface area. By comparing the adsorption of acetone on the ice/air and the water/air interface, we observed two different types of acetone adsorption, as apparent from the different responses of both the free O-H and the hydrogen-bonded network vibrations for ice and liquid water. Adsorption on ice occurs preferentially through interactions with the free OH group, while the interaction of acetone with the surface of liquid water appears less specific.
冰面和水面上的小有机分子在自然界中无处不在，并且在许多与环境相关的过程中起着至关重要的作用。在此，我们结合表面特异性振动光谱和可控流动池装置，研究丙酮在具有大表面积的单晶六方冰基面上的分子吸附。通过比较丙酮在冰/空气和水/空气界面上的吸附情况，我们观察到两种不同类型的丙酮吸附，这从冰和液态水的游离O-H以及氢键网络振动的不同响应中可以明显看出。丙酮在冰上的吸附主要通过与游离OH基团的相互作用发生，而丙酮与液态水表面的相互作用则显得不太具有特异性。
