It has been the purpose of the present paper to investigate and explore the There has been an upsurge of research interest in molecular complexes of the donor-acceptor type during the last two decades (1). Despite the large number of papers dealing with molecular complexes, only a small percentage of these studies use nuclear magnetic resonance (NMR) spectroscopy as a means of determining complex formation equilibria, their compositions, and thermodynamic data. More recent papers include the work of Kuntz (2, 3), Foster (4, 5), Hanna (6, 7), and their coworkers. In particular, Hanna and Ashbaugh (6), observing the basic assumption of Huggins and Pimentel (8) for the correlation of the NMR measurements to the equilibrium, noted that equilibrium constants in hydrogen-bonding systems can successfully be determined by NMR spectroscopy (9), and that complex formation equilibria between donors and acceptors are similar to those found in hydrogenbonding systems. According to Hanna and Foster, if the concentration of acceptor is kept considerably lower than that of the donor, then the plot of the ratio of the observed chemical shift relative to however, be investigated in a later paper. Since in most NMR measurements, we keep CAO constant and vary CDO, it is convenient to define a set of dimensionless quantities as follows: K1* = K1 CAO; CDO* = CD0/CA0; CAD* = CAD/CA0M In terms of these dimensionless quantities, Eq. 3 becomes,
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