Fig. 1
From: Molecular recognition by multiple metal coordination inside wavy-stacked macrocycles
Synthesis and characterization of hexapap ligand and Zn-hexapap. a Formation of an N,N,O-type tridentate ligand Hpap and its metal complex. b Synthesis of hexapap H6 1 from the bifunctional monomer 2 by a one-pot reaction. c Chemical structure and schematic representation of a metallomacrocycle, Zn-hexapap [1Zn6X n ], with inwardly arranged coordination sites. d–f 1H NMR spectra (600 MHz, 298 K). See b, c for the assignment of NMR signals. d 2 (CDCl3). e H6 1 (CDCl3/CD3OD = 10/1 (v/v)). f [1Zn6(acac)6] (CDCl3/CD3OD = 10/1 (v/v)). g A MALDI TOF mass spectrum of H6 1 (positive, matrix: 2,5-dihydroxybenzoic acid). The simulated and observed isotope patterns of [H6 1Na]+ are shown in the inset. h Absorbance spectra of H6 1 (green) and [1Zn6(acac)6] (purple) and emission spectrum of [1Zn6(acac)6] (red, λ ex = 546 nm) (5 μM, CHCl3/CH3OH = 10/1 (v/v), 298 K, l = 1.0 cm)
