Trinuclear Nickel(II) Complex through a 2,3,5,6-Tetrakis(2-pyridyl)pyrazine Ligand with a Linear Exchange Pathway

Callejo LM; Madariaga G; Lezama L; Fidalgo L; De la Pinta N; Cortes R

Inorganic Chemistry, Vol.49, No.12, 5353-5355, 2010

Callejo LM, Madariaga G, Lezama L, Fidalgo L, De la Pinta N, Cortes R

The compound [Ni-3(tppz)(2)(NCS)(2)(H2O)(4)center dot(NO3)(4) 4H(2)O [tp3Pz = 2,3,5,6-tetrakis(2-pyridyl)pyrazine and NCS = thiocyanate ligand] consists of trimeric units, where the three Ni-II cations are linked by two bis-tridentate tppz ligands. This compound crystallizes in the monoclinic space group C2/c, with Z = 4, a = 25.1116(12) angstrom, b = 10.8127(5) angstrom, c= 25.2294(13) angstrom, and beta = 116.856(5)degrees. The crystal structure is in good agreement with the antiferromagnetic interactions because of unidirectional coupling through the tppz ligands.