A new sensitive optical bulk test-system for thallium based on pyridylazo resorcinol

Molar absorption coefficients and stability constants of metal complexes of 4-(2-pyridylazo)resorcinol (PAR): Revisiting common chelating probe for the study of metalloproteins

“…Early literature indicates that PAR is able to associate with large numbers of metal ions from the d, p and f blocks of the periodic table [69][70][71][72][73][74]. The binding of metal ions to the PAR molecule is associated with the deprotonation of the phenolic group (pK a3 ), which has major implication for the electronic spectra of PAR (Fig.…”