Thermodynamic characterization of the dimerization equilibrium of newly synthesized polymethine cyanine dyes | Zendy

Jahan B. Ghasemi | Zendy; Fereshteh Shiri | Zendy; Todor Deligeorgiev | Zendy; Mikael Kubista | Zendy

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Thermodynamic characterization of the dimerization equilibrium of newly synthesized polymethine cyanine dyes

Author(s) -

Jahan B. Ghasemi,

Fereshteh Shiri,

Todor Deligeorgiev,

Mikael Kubista

Publication year - 2008

Publication title -

journal of the serbian chemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.227

H-Index - 45

eISSN - 1820-7421

pISSN - 0352-5139

DOI - 10.2298/jsc0810011g

Subject(s) - cyanine , enthalpy , equilibrium constant , chemistry , dimer , monomer , absorption spectroscopy , atmospheric temperature range , standard enthalpy of formation , spectral line , thermodynamics , analytical chemistry (journal) , organic chemistry , fluorescence , polymer , physics , quantum mechanics , astronomy

The monomer-dimer equilibrium and thermodynamics of three new cyanine dyes were investigated by spectrophotometric and chemometric me- thods. The dimerization constants of these new cyanine dyes were determined by studying the dependence of their absorption spectra on the temperature in the range 25-80 °C at concentrations of 3.0×10 -4 , 1.9×10 -4 and 1.1×10 -4 M for dye 1, 2 and 3, respectively. The processing of the data, performed for the quantitative analysis of pure spectral profiles, was based on the simultaneous resolution of the overlapping bands in the whole set of absorption spectra. From the dimerization constant and its dependence on temperature, the values of the standard enthalpy change and entropy change of dimerization were calculated.

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