Study of the interaction of lithium ion with pentamethylenetetrazole by lithium-7 NMR

1H-NMR study of the stoichiometry and stability of the Ba2+, Sr2+, Hg2+, Pb2+, K+, Ag+, and Tl+ complexes with a new macrocyclic diamide in acetonitrile–nitrobenzene solvent mixture

“…In accordance with the derived equation [20] by Roach et al the formation constant (log K f ) obtained by using a nonlinear leastsquares program KINFIT [21] by expresses the observed chemical shifts as a function of the free and complexed ligand, at various mole ratios of [M n+ ]/[L]. A fair agreement between the observed and calculated chemical shifts has been shown in Fig.…”

Synthesis and Binding Properties of iiii (4i) Stereoisomers of Phosphonato Cavitands − Cooperative Effects in Cation Complexation in Organic Solvents

“…The binding constant K a and the 133 Cs chemical shift of the 3·Cs ϩ complex were calculated by adjusting experimental chemical shifts to the equation corresponding to a 1:1 complex. [47] The 133 Cs resonance shifts upfield with increasing concentration of the cavitand. The chemical shift difference between the free and complexed Cs ϩ ion is |∆δ| ϭ 99 ppm.…”

31P NMR study of the stoichiometry and stability of several mercury(II) halides with a phosphorus ylide in different solvents

“…Assuming that only a 1:1 ML complex is formed in solution, and that a fast exchange conditions prevail, it can be readily shown [32] that in solutions containing fixed concentration of ligand and varying amount of metals, the observed chemical shift of the 31 P nucleus is given by the equation:…”