TOTAL ASSIGNMENT OF ¹H AND ¹³C NMR SPECTRA OF A BRIDGED TRIRUTHENIUM CLUSTER-POLYPYRIDINE DIMER BASED ON 2D (COSY, HMQC, AND HMBC) TECHNIQUES

Abstract

The bridged ruthenium cluster-polypyridine dimer [Ru 3 O (CH 3 COO) 6 (py) 2 (tmbpy)Ru(bpy) 2 (Cl)](PF 6 ) 2 (py = pyridine, bpy = 2,2 -bipyridine and tmbpy = 4,4 -trimethylenedipyridine) has been synthesized and structurally characterized based on 1 H and 13 C NMR spectroscopy. This species exhibits a complex pattern of NMR signals due to the presence of a paramagnetic [Ru 3 O] core and seven non-equivalent aromatic rings. 2D NMR (COSY, HMQC and HMBC) correlation techniques have been required for the total assignment of the 1 H and 13 C NMR spectra.

Copolymerization of n‐Butyl Methacrylate and D‐Limonene

“…Spectra for the individual monomers and a copolymer sample spectrum are shown in Figures a–c with corresponding peak identifications. These peak identifications were confirmed by 2D‐COSY NMR and 13 C NMR . In Figure c, peak a at ≈3.9 δ , was assigned to the ester group protons of BMA, while the three peaks between 4.6 and 5.5 δ were due to the protons related to the LIM double bonds, peaks g and g ′ relate to the internal double bond, while peak m is due to the external double bond.…”

Triangular ruthenium acetate clusters containing the bis(pyridyl)propane ligand and their inclusion chemistry with β-cyclodextrin

“…In the former case, there is one (1) and (3) was based on a comparison with the previously reported data for the asymmetric dimer [Ru 3 O(OAc) 6 (py) 2 (bpp)Ru(bpy) 2 (Cl)](PF 6 ) 2 that included HMBC experiments [30].…”

Investigation of a novel trinuclear μ-oxo ruthenium complex as a potential nitric oxide releaser for biological purposes

“…The 1 H NMR spectra of compounds 1-4 were assigned by comparison with analogous complexes [9,10], with the free ligands and [19,45,46]. The effect of paramagnetic anisotropy can manifest itself in two different ways: by the pseudocontact mechanism, which involves a through space dipole interaction, decreasing with the distance.…”

“…The NMR spectra are available as Supplementary material, and the relevant data for our discussion are reported inTable 3.It is well described that the signals of ligands coordinated to the [Ru3 O] moiety are dependent on the oxidation state of the ruthenium ions. Reduced complexes ([Ru 3 O] 0 ) having the formal oxidation states Ru III Ru III Ru II are diamagnetic and the signals of coordinated ligands are near to the chemical shift values observed for the corresponding free ligands[34,[43][44][45]. On the other hand, [Ru 3 O] 1+ complexes (formal oxidation states Ru III Ru III Ru III ) have one unpaired electron, being paramagnetic.…”