Research Article: {μ-2-[(3-Amino-2,2-dimethyl­prop­yl)imino­meth­yl]-6-meth­oxy­phenolato-1:2κ5O1,O6:N,N′,O1}{2-[(3-amino-2,2-dimethyl­prop­yl)imino­meth­yl]-6-meth­oxy­phenolato-1κ3N,N′,O1}-μ-azido-1:2κ2N:N-azido-2κN-methanol-2κO-dinickel(II)

Date Published: August 01, 2012

Publisher: International Union of Crystallography

Author(s): Akbar Ghaemi, Saeed Rayati, Kazem Fayyazi, Seik Weng Ng, Edward R. T. Tiekink.


Two distinct coordination geometries are found in the binuclear title complex, [Ni2(C13H19N2O2)2(N3)2(CH3OH)], as one Schiff base ligand is penta­dentate, coordinating via the anti­cipated oxide O, imine N and amine N atoms (as for the second, tridentate, ligand) but the oxide O is bridging and coordination also occurs through the meth­oxy O atom. The NiII atoms are linked by a μ2-oxide atom and one end of a μ2-azide ligand, forming an Ni2ON core. The coordination geometry for the NiII atom coordinated by the tridentate ligand is completed by the meth­oxy O atom derived from the penta­dentate ligand, with the resulting N3O3 donor set defining a fac octa­hedron. The second NiII atom has its cis-octa­hedral N4O2 coordination geometry completed by the imine N and amine N atoms of the penta­dentate Schiff base ligand, a terminally coordinated azide N and a methanol O atom. The arrangement is stabilized by an intra­molecular hydrogen bond between the methanol H and the oxide O atom. Linear supra­molecular chains along the a axis are formed in the crystal packing whereby two amine H atoms from different amine atoms hydrogen bond to the terminal N atom of the monodentate azide ligand.

Partial Text

For background to azido derivatives of tridentate Schiff base NiII complexes, see: Ribas et al. (1999 ▶); Koner et al. (2009 ▶); Biswas et al. (2011 ▶). For a related structure, see: Ghaemi et al. (2012 ▶).




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