Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn¡¯t involve a screen. 33100-27-5, C10H20O5. A document type is Article, introducing its new discovery., name: 1,4,7,10,13-Pentaoxacyclopentadecane
Ion-pair formation between Cd(II), Na(I), and Ag(I) complex ions with 18-crown-6 ether derivatives and various pairing anions in water: An understanding of the ion-pair formation based on the HSAB principle
The ion-pair formation constants (KMLX0/mol-1 dm3) of CdL2+ with Br- or NaL+ with N, N-diethyldithiocarbamate ion (DDTC-) in water were determined potentiometrically at 25C; ionic strength (I)?0: L denotes 18-crown-6 ether (18C6) and its mono-benzo derivative for the CdBr2-L system and 15-crown-5 ether and 18C6 for the NaDDTC-L one. The formation constant corresponding to the simple salt, NaDDTC, in water was also determined at I?0. Using the log KCdLX0 values of CdLCl+, CdLBr+, CdLPic+, and CdLSO4, then CdL2+ and picrate ion (Pic-) in water have been classified with the hard and soft acids and bases principle, where the values were available in the literature, except for CdLBr+. The same classification was examined in NaX-L systems with X- = DDTC-, trifluoroacetate ion, MnO4-, ReO4-, Pic-, and BPh4- and the AgPic-L one. Consequently, CdL2+, NaL+, and AgL+ were classified as the hard acids, while Pic- and BPh4- as the hard bases. These results reflected the reactivities of the complex ions in ion-pair formation with X- and SO42- in water. 2011 The Japan Society for Analytical Chemistry.
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Reference£º
Chiral Catalysts,
Chiral catalysts – SlideShare