Coordination-Driven Self-Assembly of Discrete Molecular Nanotubular Architectures BhatImtiyaz Ahmad ZangrandoEnnio MukherjeePartha Sarathi 2019 Two new <b>M</b><sub><b>8</b></sub><b>L</b><sub><b>4</b></sub> tetrafacial nanotubes (<b>T1</b> and <b>T3</b>) of different lengths have been synthesized in water using ligands <b>L1</b> and <b>L2</b>, respectively, with acceptor <i>cis</i>-[(<i>dch</i>)­Pt­(NO<sub>3</sub>)<sub>2</sub>] (<b>M</b>) using coordination-driven self-assembly [where <i>dch</i> is 1,2-diaminocyclohexane, <b>L1</b> is 1,4-di­(pyrimidin-5-yl)­benzene, and <b>L2</b> is 4,4′- di­(pyrimidin-5-yl)-1,1′-biphenyl]. In addition to complex <b>T1</b>, a tetrahedral cage of composition [M<sub>12</sub>(L1)<sub>6</sub>] (<b>T2</b>) was also formed in the self-assembly reaction of ligand <b>L1</b> with <i>cis</i>-[(<i>dch</i>)­Pt­(NO<sub>3</sub>)<sub>2</sub>]. The precise composition of the products (<b>T1</b> and <b>T2</b>) in solution was confirmed by <sup>1</sup>H NMR and ESI–MS. Pure tube <b>T1</b> was separated out by a crystallization technique and fully characterized by <sup>1</sup>H NMR and X-ray diffraction. Temperature- and concentration-dependent NMR studies indicated no equilibrium between <b>T1</b> and <b>T2</b> in the solution phase, and the proportion of <b>T1</b> and <b>T2</b> in the mixture depends on the temperature of the reaction. In contrast to ligand <b>L1</b>, the self-assembly of the longer ligand, <b>L2</b>, with <i>cis</i>-[(<i>dch</i>)­Pt­(NO<sub>3</sub>)<sub>2</sub>] gave only tetrafacial tube [M<sub>8</sub>(L2)<sub>4</sub>] (<b>T3</b>) without any tetrahedral cage.