Two new tetrafacial nanotubes ( and ) of different lengths have been synthesized in water using ligands and , respectively, with acceptor -[()Pt(NO)] () using coordination-driven self-assembly [where is 1,2-diaminocyclohexane, is 1,4-di(pyrimidin-5-yl)benzene, and is 4,4'- di(pyrimidin-5-yl)-1,1'-biphenyl]. In addition to complex , a tetrahedral cage of composition [M(L1)] () was also formed in the self-assembly reaction of ligand with -[()Pt(NO)]. The precise composition of the products ( and ) in solution was confirmed by H NMR and ESI-MS. Pure tube was separated out by a crystallization technique and fully characterized by H NMR and X-ray diffraction. Temperature- and concentration-dependent NMR studies indicated no equilibrium between and in the solution phase, and the proportion of and in the mixture depends on the temperature of the reaction. In contrast to ligand , the self-assembly of the longer ligand, , with -[()Pt(NO)] gave only tetrafacial tube [M(L2)] () without any tetrahedral cage.
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