Polarographic Behavior of Thenoyltrifluoroacetone (TTA) and Related Compounds. Alkaline Cleavage of TTA. Complexation of TTA with Borate. Analytical Determination of TTA

Thenoyltrifluoroacetone (TTA)–Carbon Dot/Aerogel Fluorescent Sensor for Lanthanide and Actinide Ions

“…This spectral modification is ascribed to the interaction between the OH group and the uranyl ion. Furthermore, the weaker vibrational bands at 400–790 cm –1 in the presence of the two ions may be traced to covalent interactions between the TTA–C-dot and the metal ions. , Overall, the Raman scattering data provide structural evidence for both retention of the TTA units on the C-dots and participation of the TTA residues in the interactions with UO 2 2+ , Sm 3+ , and Eu 3+ . These interactions likely account for the significant fluorescence shifts and changes in intensities induced by the ions.…”

Thenoyltrifluoroacetone: Polarographic and Spectrophotometric Behavior, and Dissociation Equilibria. Mechanisms of Electrolytic Reduction

“…Unlike polarography, in which current is a dependent variable, chronopotentiometry requires the choice of a current density, which may vary over a wide range, depending upon the transition time desired. Several papers recommend choosing the current density to obtain short transition times (0.3 to 1 second) (10, 19), while other authors prefer transition times in the range of 10 to 60 seconds (3,14,18). Chronopotentiometry with solid electrodes also allows the choice of an electrode from a number of different types that have been used, which include: disk electrodes (platinum disk embedded in glass) (3, 9, 10, 20), foil electrodes (9,10,14,18,20), cylindrical wire where i" is the current density (microamperes per square centimeter), is the transition time (seconds), C°is the concentration of the electroactive species (millimoles per liter), n is the number of faradays per mole of reaction, D is the diffusion coefficient of the electroactive species (square centimeters per second), and F is the faraday.…”

“…However, even at a constant concentration of the electroactive species, C°, " 2 is found to vary with current density. Davis and Ganchoff (3) recently studied this variation in the reduction of MnO<¡~, Cr207"2, Ce(IV), Fe(III), and V(V) at a platinum electrode. The variation was apparent in all of these reductions (transition times of about 5 to 80 seconds) and could not be eliminated by any choice of graphical method for evaluating r.…”

Polarographic Study of Iodothiophenes

“…Day and Blanchard (1) have studied the polarography of phenyl-2-thienyl ketone and 2,2'dithienyl ketone in buffered solutions ranging from pH 1 to 13. Elving and Callahan (2) have studied the polarographic behavior of thenoyltri-Ruoroacetone and related compounds. Tirouflet and co-workers (3) have studied the polarographic behavior of thiophene derivatives and similarly substituted benzene derivatives.…”