Simultaneous spectrophotometric determination of cobalt, nickel and copper with 2,3-quinoxaline- dithiol

Synthesis, molecular structure and supramolecular chemistry of a new nickel-quinoxaline dithiolate system [Bu4N]2[Ni(6,7-qdt)2] (6,7-qdt=quinoxaline-6,7-dithiolate) and comparison of its electronic and electrochemical properties with those of [Bu4N]2[Ni(qdt)2] (qdt=quinoxaline-2,3-dithiolate)

“…The changes in electronic absorption spectra and redox properties of relevant metal dithiolene complexes have been explored by the reversible protonation of the coordinated qdt ligand [23][24][25]. In addition, qdt-type ligands are useful in the area of analytical chemistry to analyze the metal quantification in ppm levels due to their absorption in visible region with large molar extension coefficient values [26]. The utility of qdt-complexes as ionactive substances of membrane electrodes has also been reported in literature [27].…”

Analytical coordination chemistry section.

“…A discussion of this important parameter is given by Gibson [3]. For this purpose, a spectrophotometer consisting of a quartz prism double monochromator and double beam arrangement was used.…”