[μ-2,3,5,6-Tetrakis(2-pyridyl)pyrazine κ6N 6,N1,N2:N3,N4,N 5]bis[diaqua(dihydrogen m-phenylenediphosphonato κo) nickel(II)] dihydrate

Paul Deburgomaster, Jon Zubieta

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The title compound [Ni2(C6H6O 6P2)2(C24H16N 6)(H2O)42H2O or [Ni2(tpyprz)(1,3-HO3PC6H4PO 3H)2(H2O)42H2O [tpyprz = tetra-kis-(2-pyrid-yl)pyrazine, C 24H16N6] is a binuclear complex with a crystallographic inversion center located at the center of the pyrazine ring. The equivalent nickel(II) sites exhibit a distorted {NiO3N 3} octa-hedral coordination, with the three nitro-gen donors of each terminus of the tpyprz ligand in a meridional orientation. An aqua ligand occupies the position trans to the pyrazine nitro-gen donor, while the second aqua ligand is trans to the oxygen donor of the dihydrogen-1,3-phenyl-diphospho- nate ligand. The Ni - O and Ni - N bond lengths fall in the range 2.011 (3) to 2.089 (3) Å. The protonation sites on the organo-phospho-nate ligand are evident in the significantly longer P - O bonds compared to the unprotonated sites. In the crystal structure, the complex mol-ecules and the solvent water mol-ecules are linked into a three-dimensional hydrogen-bonded framework through O - H⋯O inter-actions between the aqua ligands, the protonated organo-phospho-nate oxygen atoms and the water mol-ecules of crystallization. Intra-molecular π-stacking between the phenyl group of the phospho-nate ligand and a pyridyl group of the tpyprz ligand, at a distance of 3.244 (5) Å between ring centroids, is also observed.

Original languageEnglish (US)
Pages (from-to)m1424-m1425
JournalActa Crystallographica Section E: Structure Reports Online
Issue number11
StatePublished - Nov 2010

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


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