Search for: All records

The molar absorptivity curves for [NiLn(MeOH)6-n]2+ L = pyridine, 3-methylpyridine, 4-methylpyridine, n = 1 – 4, have been simultaneously deduced by modeling composite absorbance data of a series of equilibrium solutions in dry methanol using equilibrium-restricted factor analysis, a technique for obtaining spectral and thermodynamic information for component species involved in solution equilibria. Furthermore, the stepwise formation constants at 296 K have been determined with a high degree of accuracy. For pyridine, logK1-4 = 1.272(6), 0.669(9), 0.14(2), -0.32(2), respectively. For 3-methylpyridine, logK1-4 = 1.802(9), 1.16 (1), 0.32(1), -0.46(1), respectively. For 4-methylpyridine, logK1-4 = 2.808(9), 1.114(4), 0.411(4), -0.421(9), respectively. Unrestricted factor analysis was used to confirm the precise number of unique complexes in each case. The only additional complex for which some evidence was found was the pentakis version of the pyridine complex.