Copper Complexes of Dicarboxy-Functionalized Tetramethylcyclam. Crystal Structures of Complexes with the Axial Ligands Perchlorate, Chloride, and Iodide

✍ Scribed by T. Schönherr; E. Weber; W. Seichter

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: German
• Weight: 118 KB
• Volume: 627
• Category: Article
• ISSN: 0372-7874
• DOI: 10.1002/1521-3749(200110)627:10<2420::aid-zaac2420>3.0.co;2-x

✦ Synopsis

6,4,

4,

perchlorate (2 a) was synthesized via one-step cyclocondensation from bis(N,N'-dimethylethylenediamine-copper(II) perchlorate, formaldehyde and malonic acid. Anion exchange yielded the analogous copper(II) chloride (2 b) and iodide (2 c) complexes. Crystal structures of 2 a±2 c show a square-planar N 4 -co-ordination of the copper(II) ion with RRSS configuration of the nitrogens and perchlorate, chloride or iodide ions weakly co-ordinated axially. Relating to the macroring, the carboxy groups are in trans-position. In 2 a, the packing is typical of parallel strands of complex subunits effected by dimerization of the carboxy groups, while in 2 b and 2 c formation of the supramolecular strands involve hydrogen bond interactions between carboxy groups and halide anions.