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H. Fric, M. Puchberger, U. Schubert:
"Two- and Three-Dimensional Coordination Polymers From the Reaction of Bis- and Tris(2-aminoethyl)amine with Titanium and Zirconium Alkoxides";
European Journal of Inorganic Chemistry, 3 (2007), S. 376 - 383.

The reaction of bis(2-aminoethyl)amine with M(O_iPr)₄ (M = Ti, Zr) affords the chain-like coordination polymers [M₂(OiPr)₈(H₂NCH₂CH₂NHCH₂CH₂NH₂)]_oo , where only the NH₂ groups of the amine are coordinated to the M₂(OiPr)₈ units. 2D NMR spectroscopy shows that the adducts dissociate into the starting compounds when dissolved in CD₂Cl₂ but are slowly re-formed in solution over a period of two weeks. Puckered layers of condensed six-membered rings of [Ti₂(OiPr)₈]₃[N(CH₂CH₂NH₂)₃]₂ are formed when [Ti(OiPr)₄] is treated with tris(2-aminoethyl)amine. The voids in the center of the rings are filled by non-coordinated Ti₂(OiPr)₈ guest molecules. In contrast, chains of [Zr₂(OiPr)₈(H₂NCH₂CH₂NR CH₂CH₂NH₂)] {R = CH₂CH₂NH₂[Zr₂(OiPr)₈(HOiPr)]} are formed upon treatment of tris(2-aminoethyl)amine with [Zr(OiPr)₄].