Ruthenium nitrosyl complexes [RuNOL 2 (NO 2 ) 2 OH] with ethyl isonicotinate and pyrazine: Synthesis, structure and formation of metastable linkage isomers

Gennadiy A. Kostin, Vasily Vorobyev, Artem A. Mikhailov, Natalia V. Kuratieva

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

New complexes of ruthenium nitrosyl with ethyl isonicotinate and pyrazine were prepared in the reaction of [RuNO(NO 2 ) 2 (H 2 O) 3 ] + with corresponding ligands. With the ligand excess the reaction results in cis-[RuNOL 2 (NO 2 ) 2 OH] with good yields (78% for I L = inicEt, 35% for II L = Pyz). The dimeric complex [(RuNO(Pyz)(NО 2 )(μ-NO 2 )) 2 μ-O] (III) forms in a small yield when less than 2 molar equivalents of pyrazine are taken for the reaction. Crystal structures of all three complexes were determined by single crystal XRD. Upon blue light irradiation complexes I and II undergo isomerization from Ru–NO (ground state, GS) to Ru-ON (metastable state, MS1) group. Reverse thermal transformation MS1 – GS was studied by IR and DSC techniques, activation parameters of MS1 – GS transition are: I - E a = 53.4(4.0) kJ mol −1 , lg k 0 = 10.6(4); II – E a = 58.9(4.3) kJ mol −1 , lg k 0 = 13.5(0.4).

Original languageEnglish
Pages (from-to)334-341
Number of pages8
JournalJournal of Molecular Structure
Volume1193
DOIs
Publication statusPublished - 5 Oct 2019

Keywords

  • Calorimetry
  • Metastable compounds
  • Nitrosyl
  • Photochromism
  • Ruthenium
  • NO
  • STATES
  • ADSORPTION
  • TRANS
  • DELIVERY
  • NANOPARTICLES
  • HYDROGEN
  • NITRIC-OXIDE
  • CHEMISTRY
  • BIOLOGICAL-PROPERTIES

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