Detailed spectroscopic, thermodynamic, and kinetic characterization of nickel(II) complexes with 2,2'-bipyridine and 1,10-phenanthroline attained via equilibrium-restricted factor analysis.
The molar absorptivity curves of the mono and bis nickel(II) complexes of 2,2'-bipyridine and 1,10-phenanthroline have been deduced from the composite absorbance data of a series of equilibrium solutions in methanol using equilibrium-restricted factor analysis, a technique for extracting spectral and thermodynamic information for component species involved in solution equilibria. The solutions achieve equilibrium slowly (t(1/2) approximately 100 min) as the amounts of the tris and methanolato complexes are initially in excess. The relative formation constants at 293 K have been determined with a high degree of accuracy, especially for the bipyridine complexes: log(K(1)/K(2)) = 0.340(4) and log(K(2)/K(3)) = 1.091(6). Solubility limitations compromised the accuracy of the thermodynamic results for the phenanthroline complexes.
Griend
Douglas A Vander
DA
Department of Chemistry and Biochemistry, Calvin College, 1726 Knollcrest Circle SE, Grand Rapids, Michigan 49546-4403, USA. dvg@calvin.edu
Bediako
Daniel Kwabena
DK
DeVries
Michael J
MJ
DeJong
Nathan A
NA
Heeringa
Lee P
LP
D015082:2,2'-Dipyridyl / Q000737:chemistry*; D005163:Factor Analysis, Statistical; D007700:Kinetics; D009532:Nickel / Q000737:chemistry*; D010618:Phenanthrolines / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D013816:Thermodynamics
D010618:Phenanthrolines; D015082:2,2'-Dipyridyl; D009532:Nickel; C025205:1,10-phenanthroline