Research Article: Tri-μ-oxido-bis­[(5,10,15,20-tetra­phenyl­porphyrinato-κ4N)niobium(V)]

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.

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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 ▶).




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