S. Kumar et al., C-13 NMR MONITORED DELINEATION OF OPTIMAL BINDING STRUCTURAL PARAMETERS IN SILVER(I) SELECTIVE IONOPHORES, Indian journal of chemistry. Sect. A: Inorganic, physical, theoretical & analytical, 33(5), 1994, pp. 412-414
The C-13 NMR monitored titrations of podands 3-9 with Ag+ picrate poin
t to a unique structural combination of 2x-S- and 2x-O- intercepted by
ethylene spacers as an optimal structural parameter for Ag+ selective
binding.