Electronic supplementary
information (ESI) available:
1H NMR of 1 (Fig. S1), 2 (Fig. S2);
ROESY NMR of 1 (Fig. S3), 2 (Fig. S4); ES-MS of 1 (Fig. S5), 2 (Fig. S6),
FAB-MS of 1 (Fig. S7); NMR titration of 2 with squarate TBA salt (Fig. S8);
1H NMR of 1 in CDCl3
(host alone) (Fig. S9), 1 with
Cl− in 1∶1 molar ratio (Fig. S10), 1 with
Br− in 1∶1 molar ratio (Fig. S11), 1 with
NO3
− in 1∶1 molar ratio (Fig. S12), 2 in
CDCl3
(host alone) (Fig. S13), 2 with squarate dianion in
1∶1 molar ratio (Fig. S14). See http://www.rsc.org/suppdata/cc/b1/b102720b/