The absorption maximum of the orange-colored copper(II) complex of the cyclam derivative L, which has two 3,7-diazabicyclo[3.3.1]nonane units, occurs at 390 nm. This is the lowest value for a copper(II) tetraamine known so far, and indicates an extremely strong ligand field. This maximum is shifted by 110 nm (5740 cm , 68 kJ mol ) to lower wavelengths than that of the parent compound [Cu(cyclam)] ; cyclam=1,4,8,11-tetraazacyclotetradecane.
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