Date Published: July 01, 2011
Publisher: International Union of Crystallography
Author(s): Raoudha Soury, Mohamed Salah Belkhiria, Jean-Claude Daran, Habib Nasri.
In the title dinuclear NbV compound, [Nb2(C44H28N4)2O3], each Nb atom is seven-coordinated with three bridging O atoms and four N atoms from a chelating tetraphenylporphyrinate anion. The Nb—O bond lengths range from 1.757 (6) to 2.331 (6) Å, and the average (niobium–pyrrole N atom) distance is 2.239 Å. In the dinuclear molecule, the Nb⋯Nb separation is 2.8200 (8) Å, and the dihedral angle between the two porphyrinate mean planes is 5.4 (1)°. Weak intermolecular C—H⋯π interactions are present in the crystal structure.
For a review of porphyrin complexes, see: Scheidt (2000 ▶). For the synthesis of niobium(V) porphyrin derivatives, see: Johson & Scheidt (1978 ▶); Lecomte et al. (1979 ▶). For comparative bond lengths, see: Allen et al. (1987 ▶). For a description of the Cambridge Structural Database, see: Allen (2002 ▶).