Azido{2-[bis(2-hydroxyethyl)amino]ethanolato-κ4 N,O,O′,O′′}cobalt(II)

In the title complex, [Co(C6H14NO3)(N3)] or [Co(teaH2)N3], the CoII atom resides in a trigonal–bipymidal O3N2 environment formed by three O atoms and one N atom from a simply deprotonated tetradentate triethanolamine ligand, and one N atom from an azide ligand. The O atoms define the equatorial plane whereas both N atoms are in axial positions. The mononuclear units are linked through O—H⋯O hydrogen-bonding interactions between the ethanol OH groups and the ethanolate O atom of a neighbouring complex into chains running parallel to [010].

In the title complex, [Co(C 6 H 14 NO 3 )(N 3 )] or [Co(teaH 2 )N 3 ], the Co II atom resides in a trigonal-bipymidal O 3 N 2 environment formed by three O atoms and one N atom from a simply deprotonated tetradentate triethanolamine ligand, and one N atom from an azide ligand. The O atoms define the equatorial plane whereas both N atoms are in axial positions. The mononuclear units are linked through O-HÁ Á ÁO hydrogenbonding interactions between the ethanol OH groups and the ethanolate O atom of a neighbouring complex into chains running parallel to [010].

Related literature
For general background to complexes including teaH 3 ligands, see  ;Liu, Zhang et al. (2008). For Co II complexes with similar ligands, see: Malaestean et al. (2010).

Comment
The design and synthesis of mononuclear compounds with strong anisotropy, potentially acting as single ion magnets, are of current interest. Podand-like or multi-dentate ligands, such as diethanolamine (deaH 2 ) or triethanolamine (teaH 3 ), have been employed though these ligands were also used to prepare other kinds of clusters Liu, Zhang et al., 2008). In this work, we selected teaH 3 as a capping ligand, and azide as another anion, generating complex (I), In the structure of (I) each Co II atom is five-coordinate by three O atoms and one N atom from a simply deprotonated tetradentate triethanolamine ligand, and one N atom from an azide ligand in a trigonal-bipymidal coordination environment

Experimental
Under stirring, 2.0 mmol teaH 3 , 4.0 mmol Et 3 N and 4.0 mmol NaN 3 were added, one after another, into a 20 ml methanol solution containing 1.0 mol Co(ClO 4 ) 2 . 6H 2 O. The resulting solution was kept stirred for another hour, and then filtered. The filtrate was allowed to stand undisturbed in a sealed vessel. Crystallization took place during one week and gave crystals in a yield of 40% based on Co(ClO 4 ) 2 . 6H 2 O. The product was washed with methanol and dried in air.

Refinement
H1OA and H2OA were found in difference Fourier maps and were refined freely. All other H atoms were positioned geometrically as riding atoms, with C-H = 0.97 Å and with U iso (H) = 1.2 U eq (C). Fig. 1. View of the molecular structure of (I), showing the labelling of the atoms drawn with displacement ellipsoids at the 30% probability level. All H atoms have been omitted for clarity.