RESUMO
The hydrogen-bonded arene ruthenium metalla-rectangle, [(p-cymene)2Ru2(OOâ©OO)(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)2Ru2(OOâ©OO)Cl2 (OOâ©OO = 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.
RESUMO
The cation of the title compound, [Rh(η(5)-C5Me5)Cl(C13H12ClN3)]Cl, adopts a typical piano-stool geometry. The complex is chiral at the metal and crystallizes as a racemate. Upon coordination, the hydrazinyl-idene-pyridine ligand is non-planar, an angle of 54.42â (7)° being observed between the pyridine ring and the aromatic ring of the [2-(4-chloro-phen-yl)hydrazin-1-yl-idene]ethyl group. In the crystal, a weak inter-ionic N-Hâ¯Cl hydrogen bond is observed.
RESUMO
The title compound, [Ir(η(5)-C5Me5)Cl(C18H14ClN3)]B(C6H5)4, is chiral at the metal center and crystallizes as a racemate. In the cation, the hydrazinyl-idene-pyridine ligand is N,N-coordinated through the N-pyridyl and N-hydrazinyl-idene groups forming a five-membered metallacycle. An intra-molecular C-Hâ¯Cl hydrogen bond is observed. In the crystal, centrosymmetrically-related cations are connected by C-Clâ¯π inter-actions, forming a dimeric structure. The crystal packing is further stabilized by weak inter-ionic C-Hâ¯π inter-actions.
