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Acta Crystallographica Section E: Crystallographic Communications


crystal structure, polyaminocarboxylic acid, cobalt(III), chelating ligand


The title compound [Co(C22H26N4O4)]PF6, commonly known as [Co(bpcd)]PF6, where bpcd2- is derived from the historical ligand name N,N'-bis­(2-pyridyl­meth­yl)-trans-1,2-di­amino­cyclo­hexane-N,N'-di­acetate, crystallized by slow evaporation of a saturated aceto­nitrile solution in air. The cation of the hexa­fluorido­phosphate salt has the CoIII atom in a distorted octa­hedral coordination geometry provided by an N4O2 donor atom set. The acetate groups, which are oriented trans with respect to each other, exhibit monodentate coordination whereas the pyridyl N atoms are coordinating in a cis configuration. The geometry of the cation is compared to the geometries of other di­amino di­acetate complexes with CoIII.

Funding Source

This work was supported by Illinois State University and Loyola University Chicago. CCM acknowledges the National Science Foundation for the purchase of the Bruker APEXII diffractometer (CHE-10-39689). DSK wishes to thank Loyola University Chicago and the Schmitt Foundation for fifth year fellowship support.




First published in Acta Crystallographica Section E: Crystallographic Communications. (2015). E71, 380-384

This is an open access article published with a Creative Commons distributed under the terms of an attribution license (

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