Fig. 2. DOSY spectrum of a 1 : 0.5 mixture of 3b and TBAH2PO4. The mixture was produced by titrating a 0.8 mM CDCl3 solution of TBAH2PO4 into a turbid mixture of 3b in CDCl3 until the ratio of integration values corresponding to 3b and 3b·H2PO4– was equal. ^ shows signals ascribed to free 3b; * shows those assigned to 3b·H2PO4–.
