Infrared Detection with Temperature Sweep for Stability Determination of Ru-ON Metastable States

Abstract

A novel method is proposed for studying the thermal decay of the oxygen-coordinated nitrosyl metastable states. Having examined 18 different ruthenium nitrosyl complexes, we observed that, upon photoinduced rotation from Ru-NO to Ru-ON coordination, the frequency of the nitrosyl valence bands shifts, on average, by 126 ± 15 cm–1. The thermal stability of the product Ru-ON state is qualitatively characterized (decay temperature, Arrhenius activation energy, and pre-exponential factor) using infrared absorption of the NO group, in comparison with the reference complex­(es), which are all heated in the same KBr disk during temperature sweep.

Solution and solid-state light-induced transformations in heterometallic vanadium-ruthenium nitrosyl complex

“…The population of MS1 is about 5%. The band exhibits a shift to lower energies compared to the GS band by 150 cm -1 , which is characteristic for nitrosyl ruthenium complexes [2,12,71,[95][96][97]. The concomitant decrease of intensities of the NO 2 bands is most probably related to the nitrosyl isomerization and partial NO release (see below) (Fig.…”

Metalloligand-based coordination polymer embedding the nitrosyl ruthenium complex for photoactive materials with bound nitric oxide

“…The known photo-induced metastable states with the oxygen-coordinated nitrosyl group have the nitrosyl valence vibration shifted by 120–150 cm −1 from the initial ν (NO) absorption. 49 In the IR spectra of the studied {Ru} and {ZnRu 2 } compounds, a new band appeared at 1720 cm −1 in both cases (Fig. 7).…”

“…7). An additional band at 1773 cm −1 belonged to the previously characterized fac -K 2 [RuNO(NO 2 ) 2 Cl 3 ] complex, 49 which was an internal standard for temperature calibration.…”

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

“…Upon blue‐light irradiation at 77 K, two new bands build up at 1804 and 608 cm –1 . The 1804 cm –1 band was assigned to the valence vibration of the isomeric O ‐coordinated nitrosyl group ( MS1 ) based on the 131 cm –1 shift from ν GS (NO) . The band at 608 cm –1 is the spectral feature to the Ru–ON valence vibration.…”