Abstract
The X-ray crystal structure of the title octaazamacrocycle with a 28-membered ring shows that it is capable of incorporating a symmetrical copper–copper bonded unit which contains a short Cu–Cu bond [2·445(4)A]; the compound is paramagnetic with µeff= 1·87 µB at 300 K, exhibiting a single line at g= 2·09 in the X-band e.s.r. spectra of solid samples or of frozen acetonitrile solutions (77 K).
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