On the interaction of copper with tris(hydroxymethyl)aminomethane

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The interaction of copper with tris(hydroxymethyl)aminomethane (TRIS) has been studied by optical and esr spectroscopic techniques. In solution, three different copper complexes are obtained as a function of pH. At pH 10 the room temperature esr parameters are g0 = 2.135, A0 = 82 G and nitrogen superhyperfine structure /tN = 9.5 G, characteristic of two nitrogen ligands; at pH 6.5, go = 2.147, A0 = 65 G and at pH 5.0, g0 = 2.180, A0 = 44 G. The high pH complex was crystallized and its molecular structure determined by X-ray methods. Space group and cell dimensions are C2/c, a = 12.955(2) Å, b = 10.793(1) Å, c= 10.091(2) Å,β= 116.62(1)°, V= 1261.4(6)Å3 = 4, Dc = 1.694gcm-3, R = 0.034 for 938 reflections with I > 3σ(I). The Cu2+ ion is located on the two-fold axis and coordinated to the oxygen and nitrogen atoms of two TRIS moieties; these ligand atoms form the rectangular base of a pyramid structure in which oxygen from a water molecule acts as the fifth ligand.



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Canadian Journal of Chemistry, v. 65, n. 4, p. 821-826, 1987.