Complex formation thermodynamics spectrophotometric method

The method of proton or nuclear magnetic resonance has been applied to the compounds (C5H6)2ReH and Fe(C5H6)2 (213, 132). Furthermore, attempts were made by spectrophotometric methods to establish the formation of a thermodynamically stable molecular complex of fer rocene (H). According to these measurements, ferrocene and iodine together in solution show no charge transfer complex, but are merely in thermal equilibrium with ferricinium triiodide. 

The formation kinetics and the thermodynamic stability of iron(III) complexes with a new tetraden-tate ligand, N(alpha)-salicyTL-alaninehydroxamic acid (H-2slalh), have been investigated by the use of UV-visible and stopped-flow spectrophotometric methods. By comparing the pH-dependent absorbance change, the mechanism of the complex formation was explained. 

The formation constant of the NiCf complex has been determined by a spectrophotometric study at 298.15 K in concentrated HCl (4.4 - 10.67 M) and LiCl (2.94 - 12.46 M) solutions, and the formation constant of the NiCl2 complex was tentatively estimated. The method used by the author results in a semi-thermodynamic constant, in which the activity of chloride ion is considered, but the ratios y. 2, and /yNicij were assumed to be nearly constant with... 

Complexes of a number of metal ions, viz. Mn(ii), Co(n), Ni(n), Cu(ii), Zn(ii), Pr(ni), Nd(iii), Sm(ni), and Yb(lll), with 3-(a-benzoylbenzylidenehydrazino)-5,6-diphenyl-l,2,4-triazine have been studied by potentiometric, spectrophotometric, and electrochemical methods. The standard thermodynamic parameters, AG , A/7°, and AA , terms for dissociation and for the stepwise formation of metal-ligand complexes were evaluated <2001SRI205>. 

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