期刊
DALTON TRANSACTIONS
卷 45, 期 4, 页码 1410-1421出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5dt04179a
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资金
- University of Neuchatel
- Neuchatel Platform of Analytical Chemistry (NPAC)
- Swiss National Science Foundation (SNSF) [200020-152716]
- Ecole Polytechnique Federale de Lausanne (EPFL)
The hydrogen-bonded arene ruthenium metalla-rectangle, [(p-cymene)(2)Ru-2(OOnOO)(UPy)(2)](2)(4+), obtained from 1-(4-oxo-6-undecyl-1,4-dihydropyrimidin-2-yl)-3-(pyridin-4-ylmethyl)urea (UPy) and the dinuclear arene ruthenium clip (p-cymene)(2)Ru-2(OOnOO)Cl-2 (OOnOO = 2,5-dioxido-1,4-benzoquinonato), is investigated by means of solution-phase NMR spectroscopy. Rotating frame nuclear Overhauser effect measurements are used to probe the H-bond network that drives the UPy self-assembly as well as the full rectangular supramolecular system. An effective distance that takes into account both intra-and intermolecular polarization-transfer pathways is utilised for data analysis. The experimental findings are corroborated by DFT calculations of NMR parameters and internuclear distances, thus confirming the formation of a very stable tetranuclear metalla-assembly.
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