Tris(ethane-1,2-diamine)copper(II) bis(trifluoroacetate)

Abstract

In the title complex, [Cu(H2NCH2CH2NH2)3](CF3COO)2, the environment of the Cu atom is distorted octa­hedral, formed by six N atoms from three chelating ethane-1,2-diamine ligands. The Cu—N distances range from 2.050 (2) to 2.300 (2) Å. This complex cation and the two trifluoro­acetate anions are connected by weak N—H⋯O and N—H⋯F hydrogen bonds, forming a three-dimensional framework. In both anions, the F atoms are disordered over two positions; in one the site-occupancy factors are 0.55 and 0.45, in the other the values are 0.69 and 0.31.

The first-row transition-metal series of tris(ethylenediamine) diacetate complexes [M(en)3](OAc)2 (M is Mn, Fe, Co, Ni, Cu, and Zn)

“…(Groom et al, 2016), with data collection at a different temperature (Tasker et al, 2005). Jahn-Teller distortion is also observed in that data set and also in the structure of the trifluoroacetate salt (Karpova et al, 2008). The crystals of the title compounds are racemates, with the cations in the asymmetric unit possessing a chiral Ã() configuration, while the other inversion-generated cations in the unit cell are the Á() enantiomer.…”

Synthesis and characterization of enantiopure copper(ii) complexes using chiral bidentate ligands

“…4 Very recently, the copper(II) complex [Cu(en) 3 ](CF 3 CO 2 ) 2 was obtained through an addition of an excess of en and its single-crystal structure was reported. 5 In general, when formed in octahedral metal complexes, the coordination geometries around metal ions show K and D absolute configurations in racemates. However, the prediction of complexation and chirality remains a significant challenge.…”