Crystal structures of the dinitrate-bis-(acetylenedicarboxylate) and acetylenedicarboxylate pseudorotaxane complexes of [24-pyrimidinium crown 6

Abstract

The reaction of [24-Pyrim C6][ \( {\text{NO}}_{{\text{3}}} \)]6 · 8H2O with the monopotassium salt of acetylenedicarboxylic acid yielded single crystals of [24-Pyrim C6][C4O4]2[\( {\text{NO}}_{{\text{3}}} \)]2 · 7H2O, (1). The compound crystallized in the triclinic space group P\( \overline{1} \), with a = 9.731(8) A, b = 10.953(9) A, c = 14.270(14) A, α = 108.06(7)°, β = 94.86(7)°, γ = 99.01(7)°, Z = 1, R = 0.0737, R′ = 0.1024, and 3709 independent reflections. The reaction of [24-Pyrim C6]Cl6 with the monopotassium salt of acetylenedicarboxylic acid gives single crystals of the inclusion complex {[24-Pyrim C6][C4O4]2} · [\( {\text{C}}_{{\text{4}}} {\text{O}}_{{\text{4}}} \)]0.92Cl0.17[H2C4O4]0.16 · 10H2O, (2). The compound crystallizes in the triclinic space group P\( \overline{1} \), with a = 13.543(3) A, b = 14.354(8) A, c = 17.484(8) A, α = 74.35(4)°, β = 79.12(3)°, γ = 69.77(3)°, Z = 2, R = 0.0976, R′ = 0.2662, and 5655 independent reflections with. Strength of binding and size of the nitrate and chloride counter ions in the reacting species determines the mode of acetylenedicarboxylate binding to the cation upon crystallization.