Formation of pseudorotaxanes containing calix-bis-crowns and secondary ammonium ions and their thermodynamic stabilities in a solution: preorganization by second macrocycle and nonallosteric behavior exhibited by large crown cavities
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This paper describes the formation of pseudorotaxanes containing calix-bis-crowns, exhibiting a 1,3-alternate conformation and large crown cavities, and secondary ammonium ions. The first and second association constants of pseudorotaxane formation are moderate (K1 = 175, K2 = 100 M-1) and are higher than that of the corresponding pseudorotaxane (K = 24 M-1), consisting of a calix-mono-crown and the same secondary ammonium ion.
- Tetrahedron Letters
Tetrahedron Letters 54(60), 6829-6833, 2013-12