Application of 33100-27-5, Chemistry can be defined as the study of matter and the changes it undergoes. You’ll sometimes hear it called the central science because it is the connection between physics and all the other sciences, starting with biology.33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5. In a patent, introducing its new discovery.
Calorimetric titrations have been performed in anhydrous acetonitrile at 25 deg C to give the complex stability constants (KS) and the thermodynamic quantities for the complexation of light lanthanoid(III) nitrates (La-Gd) with 15-crown-5 (1), less-symmetrical 16-crown-5 (2), and the related lariat ether 15-(2,5-dioxahexyl)-15-methyl-16-crown-5 (3).These structurally related crown-5 derivatives gave stoichiometric 1:1 complexes with light lanthanoids, displaying strikingly different cation selectivity profiles.Thus, the complex stability as a function of reciprocal ionic diameter of lanthanoid showed a monotonically declining pattern for 1, a unique profile for 2 characterized by a sudden jump of KS at Nd and a subsequent plateau, and a relatively flat pattern for 3.Thermodynamically, the complexation is absolutely enthalpy-driven, while the cation selectivity is evidently entropy-governed.The unique complexation behavior of 2 is attributed to the entropic loss that is minimized only when a strict size match is materialized between the cavity of 2 and the ionic diameter of the lanthanoids, i.e., Nd-Gd.On the other hand, the poor cation selectivity for 3 is ascribed to the adjustable three-dimensional cavity induced upon lariat ligation, making the operation of strict size fitting difficult.
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