Abstract
Herein, we describe the design and synthesis of three tetranuclear complexes, [(Cp*Rh)(L1)]4(OTf)4 (1a, HL1 = 2-(pyridin-4-yl)-1H-imidazo[4,5-f][1,10]phenanthroline), [(Cp*Ir)(L1)]4(OTf)4 (1b), and [(Cp*Rh)(L2)]4(OTf)4 (2, HL2 = 2-(4-(pyridin-4-yl)phenyl)-1H-imidazo[4,5-f][1,10]phenanthroline). Owing to the precise design of the phenanthroline-derived ligands, these complexes exhibit perfect square-shaped structures with side lengths of 13.53, 13.57, and 17.95 A, respectively. These molecules orderly align and assemble into square-shaped, one-dimensional nanotubes. The molecular structures and arrangement of the nanotubes were evidenced by single-crystal X-ray diffraction. Solution behavior was studied by NMR spectroscopy. Fourier transform infrared spectroscopy and elemental analysis were also employed to characterize these complexes.
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