Wólfel (Technische Hochschule Darmstadt) provided access to the facilities (four-circle diffractometer and computer) of the Stoe + Cie. Application Laboratory, Darmstadt. The authors appreciate discussions on the manuscript with Dr. K. J. Wannowius. Propargylaldehyde was supplied by BASF, Ludwigshafen.Registry No. II, 22119-38-6; IV, 88106-41-6; Cu(TMBC)(C104)2, 88106-43-8; Cu(TMBC)I(C104), 88106-45-0; Cu(TMBC)(N3)(C104), 88106-47-2; Cu(TMBC)Br(C104), 88106-49-4; Cu(TMBC)(N03)2, 88106-51-8; Ni(TMBC)(C104)2, 88106-53-0; Ni(TMBC)Br2, 88106-54-1; Ni(TMBC)(N03)2, 88106-56-3; Cu(TMBC)(H20)2+, 88106-57-4; Cu(TMBC)N3+, 88106-46-1; Cu(TMBC)2+, 88106-58-5.Supplementary Material Available: Listings of observed and calculated structure factors and atomic parameters for TMBC, Cu-(TMBC)(N3)(C104), and Cu(TMBC)(C104)2 (105 pages). Ordering information is given on any current masthead page.

The macrobicyclic polyammonium receptor molecule 1-6H+ binds dicarboxylate substrates with linear recognition and forms with terephthalate a very stable dianion cryptate the crystal structure of which has been determined.

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