Surface Trapping and STM Observation of Conformational Isomers of a Bis(Terpyridine) Ligand from Metallosupramolecular Grids |
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| Authors: | Sujoy Karan Dr Christian Hamann Dr Hao Tang Dr Artur R Stefankiewicz Prof Jean‐Marie Lehn Prof Richard Berndt |
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| Institution: | 1. Institut für Experimentelle und Angewandte Physik, Christian‐Albrechts‐Universit?t zu Kiel, 24098 Kiel (Germany);2. CEMES/CNRS, 29 rue Jeanne Marvig, B.P. 94347, 31055 Toulouse Cedex (France);3. Université de Toulouse, UPS, 31055 Toulouse (France);4. Institut de Science et d'Ingénierie Supramoléculaires, Université de Strasbourg, 67000 Strasbourg, (France);5. Current Address: Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, 61‐614 Poznań (Poland);6. Centre for Advanced Technologies, Adam Mickiewicz University, Umultowska 89b, 61‐614 Poznań (Poland) |
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| Abstract: | Tetranuclear Co‐grid complexes incorporating bis‐tridentate ligands, namely 4,6‐bis(2,2′‐bipyrid‐6‐yl)‐2‐phenylpyrimidine, were electrosprayed onto a Au(111) substrate under an ultrahigh vacuum. Fragmentation occurs leaving the ligands in four different conformations. Most ligands are found to form H‐bonded dimers. The most abundant conformer of the ligand on the Au surface is an asymmetric form, which has not been observed before. The present results indicate that the fragmentation of coordination compounds during the deposition process, in principle, allows for surface trapping, identification, and investigation of high energy, out‐of‐equilibrium conformations of the ligand molecules at low temperatures, which otherwise would not be observable. |
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| Keywords: | conformational analysis mass spectrometry metallosupramolecular grids scanning tunneling microscopy supramolecular chemistry |
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