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Abstract
A new ligand. 1, 12, 15-triaza-3.4: 9, 10-dibenzo-5, 8-dioxacyclopentadecane, has been synthesized and characterized as the hydrobromide salt, on the bases of analytical data, 1H NMR. IR and FAB mass spectra. An X-ray crystal structure shows the ligand crystallizes in the rhombohedral system, space group R3, with 0 = 35.194(1), b = 35.194(1), c = 10.397(1)Å, γ = 120°. V = 11152.6(1) Å3, Z = 18, refined to R = 0.061 for 1120 observed reflections with I>3σ(I) from 3392 independent reflections. Stability constants for 1:1 complexes of transition metals and protonation constants for the ligand have been determined by potentiometric titration in 95% ethanol (I = 0.1, (CH3)4NC1) at 25°C.