SummaryFollowing X-ray crystal structure studies, the products of the reaction between Cu(I1) halides and tris(hydroxymethy1)methylamine (TRIS) can be formulated as [Cu(TRISH-,)(TRIS)],X, and [Cu(TRISH_,)X], (X = C1, Br). TRISH-, is the deprotonated ligand. Initial metal-ligand stoichiometric ratios of 1 : 2 and 1 : 1 are required to obtain the former and the latter species, respectively. Relevant crystal data for the dimeric compound with X = Br are: monoclinic, a = 11.394 (2) the arrangement is significantly puckered at this vector. One of these bridging O-atoms has p3 character as it serves as a weak apical donor for a Cu-atom of another binuclear unit. Thus a step-like geometry of the central core is obtained. Both compounds have constant magnetic moments at least down to the liquid N, temperature. In this respect, they differ from other complexes of Cu(I1) having comparable geometries, but temperature-dependent magnetic moments.Introduction. ~ The compound tris(hydroxymethy1)methylamine (TRIS)
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