Synthesis, crystal structure and properties of trans -[Cu(sac) 2 (en) 2 ] (sac=saccharinato and en=ethylenediamine).

Guney, Serkan; Yilmaz, Veysel T; Harrison, William TA

The title complex trans -[Cu(sac) 2 (en) 2 ] (sac  =  saccharinato, en  =  ethylenediamine) has been obtained accidentally by the reaction of piperazine (ppz) with [Cu(sac) 2 (H 2 O) 4 ]·2H 2 O in butanol solution. During the reaction, ppz was presumably decomposed to produce en which then coordinated to copper(II) to yield the title complex. trans -[Cu(sac) 2 (en) 2 ] has been characterized by elemental analysis, IR, UV-VIS, magnetic measurements and single crystal X-ray diffraction. The compound crystallizes in space group (No. 2) and it consists of neutral units linked by bi- and trifurcated N–H···O hydrogen bonds into chains which are further connected by aromatic π–π stacking interactions forming a three-dimensional supramolecular network. The copper(II) ion in [Cu(sac) 2 (en) 2 ] sits on a inversion centre and is octahedrally coordinated by two neutral en and two anionic sac ligands. An elongated distorted octahedral geometry along the Cu–N sac bonds is a consequence of the Jahn–Teller effect. The en ligand acts as a bidentate (N,N′) chelating ligand, while sac is N -coordinated. IR and UV spectra and thermal analysis are in agreement with the crystal structure.

ETHYLENEDIAMINE; COPPER; CHEMICAL reactions; PIPERAZINE; HYDROGEN bonding; JAHN-Teller effect

Journal of Coordination Chemistry, 2006, Vol 59, Issue 10, p1123

0095-8972

Academic Journal

10.1080/00958970500453218