Tris-(hydroxyamino)triazines: high-affinity chelating tridentate O,N,O-hydroxylamine ligand for the cis-(VO2+)-O-V cation

Vladimiros A. Nikolakis, Vassiliki Exarchou, Tamas Jakusch, J Derek Woollins, Alexandra M. Z. Slawin, Tamas Kiss, Themistoklis A. Kabanos

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

The treatment of the trichloro-1,3,5-triazine with N-methylhydroxylamine hydrochloride results in the replacement of the three chlorine atoms of the triazine ring with the function -N(OH)CH3 yielding the symmetrical tris-(hydroxyamino) triazine ligand H-3 trihyat. Reaction of the ligand H-3 trihyat with (NaVO3)-O-V in aqueous solution followed by addition of Ph4PCl gave the mononuclear vanadium(V) compound Ph4P[(VO2)-O-V(Htrihyat)] (1). The structure of compound 1 was determined by X-ray crystallography and indicates that this compound has a distorted square-pyramidal arrangement around vanadium. The ligand Htrihyat(2-) is bonded to vanadium atom in a tridentate fashion at the triazine ring nitrogen atom and the two deprotonated hydroxylamido oxygen atoms. The high electron density of the triazine ring nitrogen atoms, which results from the resonative contribution of electrons of exocyclic nitrogen atoms, leads to a very strong V-N bond. The cis-[(VO2)-O-V(Htrihyat)](-) species exhibits high hydrolytic stability in aqueous solution over a wide pH range, 2.5-11.5, as was evidenced by potentiometry.

Original languageEnglish
Pages (from-to)9032-9038
Number of pages7
JournalDalton Transactions
Volume39
Issue number38
DOIs
Publication statusPublished - 2010

Keywords

  • MODELING SUPRAMOLECULAR INTERACTIONS
  • DENSITY-FUNCTIONAL THEORY
  • HUMAN-SERUM TRANSFERRIN
  • VANADIUM COMPLEXES
  • SOLID-STATE
  • METAL-COMPLEXES
  • IN-VITRO
  • STRUCTURAL-CHARACTERIZATION
  • DEPENDENT HALOPEROXIDASES
  • COORDINATION-COMPOUNDS

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