Two novel dioxotriamine macrocycles (1, 4, 7-triazacyclodecane-8, 10-dione (td), 9-(2'-hydroxylbenzyl)-1, 4, 7-triazacyclodecane-8, 10-dione (btd)) have been synthesized and characterized by elemental analysis, IR, 1H NMR and MS. The introduced substitutent has considerable effect on ligand synthesis, which was explained through molecular mechanics. By pH potentiometric titration at 25±0.1℃, I=0.1mol/L KNO3, the ligand (btd) protonation constants and its complexation equilibrium constants with Cu(II) have been determined, and the complexation form of this kind of ligands with Cu(II) was postulated together with the results obtained by spectra titration and EPR of the complexes. We concluded that dioxotriamine macrocycles would be regarded as a new kind of ligands different from both saturated N3 macrocycle and dioxotetraamine.

Key words: INFRARED SPECTROPHOTOMETRY, ELEMENTAL ANALYSIS, MASS SPECTROGRAPHY, NITROGEN HETEROCYCLICS, COPPER COMPLEX, PROTON MAGNETIC RESONANCE SPECTROMETRY, DIKETONE, AMIDES P