Figure 6: Particle-size distribution and solution behaviour of SK-1 cages in CHCl3.
From: Ultra-large supramolecular coordination cages composed of endohedral Archimedean and Platonic bodies
(a) UV-vis spectra of PPP in CHCl3 ([PPP]∼1 × 10−5 M, black line), SK-1/PPP in CHCl3 ([SK-1]∼2 × 10−5 M, [PPP]∼7.5 × 10−4 M, red line) and 7-amino-4-methylcoumarin (AMC) in CHCl3 ([AMC]∼1 × 10−5 M, blue); (a) inset Fluorescence spectrum of SK-1/PPP in CHCl3 ([SK-1]∼2 × 10−6 M, [PPP]∼7.5 × 10−5 M, λex=338 nm); (b) Particle-size distribution (measured from Fig. 5e); (c) Fluorescence titrations characterizing the host–guest interactions between 7-amino-4-methylcoumarin (AMC) and the coordination cages (λem_max ca. 391 nm; λex=338 nm); Fluorescence quenching when aliquots of a SK-1/PPP solution in CHCl3 ([SK-1]∼2 × 10−7 M, [PPP]∼7.5 × 10−6 M) are added to an AMC solution in CHCl3 (1 × 10−7 M). (d) Stern–Volmer plots (λem=391 nm; λex=338 nm) that are characteristic for static quenching and indicating binding (see inset) between the coordination cages and AMC.
