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- W2058102007 abstract "Abstract Two new azamacrocycles 1,7-bis(2-hydroxy-5-nitrobenzyl)-4,10-dimethyl-1,4,7,10-etraazadodecane (L1) and 1,13-bis(2-hydroxy-5-nitrobenzyl)-4-10-dimethyl-4,7,10,16-tetramethyl-1,4,7,10,13,16,-hexaazaoctadecane (L2) have been synthesised and characterised. The basicity behaviour has been studied by potentiometry at 298.1 K in 0.15 mol dm 4Me4NCl, by 1H and 13C NMR spectroscopy, as well as by UV-Vis spectroscopy. L1 behaves as a tetraprotic base in the pH range investigated: log K113, log K2 = 10.59(1), log K3 = 7.18(2) and log K4 = 4.86(2). L2 behaves as a hexaprotic base; log K1 = 10.38(2), log K2 = 9.96(2), log K3 = 8.29(2), log K4 = 5.71(2), log K5 = 4.68(3) and log K6 = 2.2(1). The influence on the basicity behaviour of the nitrophenolic side arms is dicussed. In the case of L2, the equilibria with Cu(II) have been studied by a potentiometric technique. Four main species have been found: the binuclear species [Cu2L2]2+ (log K = 28.7(1)), and three protonated species: [CuH2L2]2+, [CuH3L2]3+, [CuH4L2]4+, For the L1/Cu(II) system the precipitation of a solid compound prevents the determination of any stability constants, however the coordination behaviour of L1 toward Cu(II) is observed in the crystal structure of [CuL1]ClO4. Crystals of [CuL1]CO4 are triclinic, space group P1, with a = 8.777(3), b = 10.744(3), c = 15.814(3) A , α = 100.58(2), β = 98.47(2), γ = 101.16(2) 0 , Z = 2, R = 0.070 ." @default.
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- W2058102007 date "1998-07-01" @default.
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- W2058102007 title "Binding properties and crystal structures of azamacrocycles containing nitrophenol side arms" @default.
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- W2058102007 doi "https://doi.org/10.1016/s0020-1693(97)06057-x" @default.
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