Computation of Association Constants from Spectrophotometric Data. II. Multiple Equilibria

1965 ◽  
Vol 87 (8) ◽  
pp. 1655-1660 ◽  
Author(s):  
G. Dana Johnson ◽  
Ronald E. Bowen
Keyword(s):  
Multiple Equilibria ◽  
Association Constants ◽  
Spectrophotometric Data

scholarly journals Association of Thymolsulfonephthalein and Cresolsulfonephthalein Anions with Cationic Cyanines in Aqueous Solution

2010 ◽  
Vol 4 (4) ◽  
pp. 271-276
Author(s):  
Serghiy Shapovalov ◽  
◽  
Yana Kiseliova ◽  
Keyword(s):  
Aqueous Solution ◽  
Enthalpy Of Formation ◽  
Association Constants ◽  
Semiempirical Methods ◽  
Solution Equilibrium ◽  
Spectrophotometric Data ◽  
The Enthalpy Of Formation ◽  
Quinaldine Red

The formation of associates between one- or two-charged anions of sulfonephthalein dyes – thymolsulfonephthalein, cresolsulfonephthalein – and cyanine cations (pinacyanol, quinaldine red) has been considered in aqueous solution. Equilibrium association constants have been determined using spectrophotometric data. By semiempirical methods the enthalpy of formation and the eventual structure of ions and associates have been established.

Molecular complexes: effects of multiple equilibria on calculated absorptivities and association constants

1969 ◽  
Vol 47 (14) ◽  
pp. 2605-2611 ◽  
Author(s):  
C. C. Thompson Jr.
Keyword(s):  
Multiple Equilibria ◽  
Molecular Complexes ◽  
Formation Constants ◽  
Association Constants ◽  
Complex Species ◽  
Donor Acceptor ◽  
Order Complexes ◽  
High Degree ◽  
Absorbance Data ◽  
Stoichiometric Complex

Simulated absorbance data have been used to demonstrate the effects of 2:1 molecular complexes on formation constants and absorptivities calculated for 1:1 donor–acceptor interactions. By systematic variation of associated spectral, thermodynamic, and concentration parameters for these systems, it is found that previous attempts to describe effects produced by the presence of more than one stoichiometric complex species are inadequate. Formation constants and absorptivities calculated with the assumption of a simple 1:1 interaction may be increased or decreased by the occurrence of higher order complexes. These variations depend largely on the ratios of complex absorptivities, relative formation constants, and the range of donor concentrations. Equations incorporating 5 of the experimental variables permit the prediction of formation constants and absorptivities to a high degree of accuracy.

Spectrophotometric reductions with an IBM 1620

1966 ◽  
Vol 24 ◽  
pp. 116-117
Author(s):  
P.-I. Eriksson
Keyword(s):  
Astronomical Data ◽  
Spectrophotometric Data ◽  
Electronic Computers ◽  
The University ◽  
Near Future

Nowadays more and more of the reductions of astronomical data are made with electronic computers. As we in Uppsala have an IBM 1620 at the University, we have taken it to our help with reductions of spectrophotometric data. Here I will briefly explain how we use it now and how we want to use it in the near future.

Sign in / Sign up

Export Citation Format

Share Document