Photocrystallographic, Spectroscopic, and Calorimetric Analysis of Light‐Induced Linkage NO Isomers in [RuNO(NO₂)₂­(pyridine)₂OH]

Reaction of [RuNO(NO2)4OH]2– with Sulfamic Acid as a Pathway to Mixed Nitro Pyridine Ruthenium Nitrosyl Complexes

“…As the distance between N5 (pyridine ring of the cation) and O1 (OH ruthenium fragment) is short enough for hydrogen bonding (2.697 Å), we suppose that the proton compensating the anionic charge is localized between these atoms, because other counter ions are absent according to the X‐ray diffraction and elemental analyses. The Ru–NO 2 bond lengths differ significantly in the anion, the distance Ru–N2 to the NO 2 group in the trans position with respect to the pyridine molecule [2.060(2) Å] is close to that in the complex [RuNO(NO 2 ) 2 (Py) 2 OH] . The distance Ru–N for the NO 2 group trans to the ONO ligand is longer by 0.1 Å and close to the bond length of Ru–ONO.…”

“…The synthetic approaches used for the preparation of the ruthenium complexes is given in Scheme . As shown in our previous article, the reaction of [RuNO(NO 2 ) 4 OH] 2– ( An 2– ) with 2 equivalents of sulfamic acid can be used for synthesis of [RuNO(NO 2 ) 2 Py 2 OH] in almost quantitative yield. We tried to extend this approach but the results showed that with another stoichiometry the reaction became more complicated.…”

“…The IR spectra of complexes 1 – 3 in the range of the ν(NO) vibrations (Figure ) before and after irradiation at a wavelength of 445 nm shows that the NO ligand can be isomerized but with a low population of the photoinduced state. The wavelength 445 nm was chosen to maximize the population of the photoinduced state based on our results obtained for [Ru(NO)(NO 2 ) 2 Py 2 (OH)]H 2 O . As discussed in ref .…”

Synthesis of the Ruthenium Nitrosyl Complex with Coordinated Ammonia and Pyridine at Room Temperature

“…As the model N ‐donating ligand, we chose pyridine. The pyridine ruthenium complexes containing nitrosyl group are known . It is worth mentioning that the synthetic methods for pyridine complexes can be adjusted to obtain complexes with pyridine‐like ligands , .…”

Cytotoxicity and Crystal Structures of Nitrosoruthenium Complexes mer‐[Ru(NO)Py2Cl3] and mer‐[Ru(NO)(γ‐Pic)2Cl3]

“…Earlier G. A. Kostin and co‐workers reported the synthesis, photochemical and cytotoxic properties of several nitrosoruthenium complexes . The authors demonstrated that complexes with 3‐MePy and 4‐MePy exhibited a 50% decrease in the growth of cancer cells at remarkably low and comparable concentrations (0.82–3.2 mM), in the same time neutral [RuNO(NO 2 ) 2 L 2 OH] (L – Py, 3‐MePy, 4‐MePy) complexes were approximately 10–20‐fold more active than the anionic [RuNOPy(NO 2 ) 2 (ONO)OH].…”