Ammonium ion complexation

Assemblies of Cavitands Through Ammonium Ions Complexation... 

Ai -Aminooxymethylcarbonylhydrazino-D-biotin, DNA oxidative damage, 736, 634 3-Aminophthalate, luminol oxidation, 643, 644, 1239-41, 1244-6 7-Amino-4-trifluoromethylcoumarin, hydrogen peroxide determination, 649 Ammonium ion complex, mass spectrometry, 703, 704... 

Figure 3.64 Perching geometry in alkyl ammonium ion complexes of Me3[18]ane-03N3 held together by charge-assisted hydrogen bonds.

Metz, B., Rosalky, J. M., Weiss, R., [3] Cryptates - X-ray crystal-structures of chloride and ammonium ion complexes of a spheroidal macrotricyclic ligand. J. Chem. Soc., Chem. Commun. 1976, 533-534. 

The encapsulation of small molecules, such as N2, O2, methanol, or acetonitrile in ammonium ion complexed Me-CB [5] in the gas phase, was observed using electro-spray ionization Fourier transform mass spectrometry. " The guest is released in the gas phase upon removing an ammonium ion Mid using 18-crown-6. The rate of guest release depends on the size of the guest molecules. 

Figure 2.29 Primary ammonium ion complexation by macrocyclic polyethers and aza-polyethers (87).

Acyl transfer processes are of immense strategic and synthetic importance in synthesis and biology. In Fignre 12, the ability of peptidases snch as chymotrypsin to cleave amide bonds using a nncleophilic serine-195 residne to generate an activated acyl-enzyme intermediate was described. Numerous supramolecular structures have been designed that mimic these natural enzymatic acyl transfer processes, such as Lehn s crown ether/ammonium ion complexation... 

---