The reaction between 2,4,6-trinitrophenol(TNP) and the polycyclicamine 1,4,8,11-tetraazacyclotetradecane (TACTD) in solvents such as chloroform and carbontetrachloride have been studied spectrophotometrically using UV-VIS, and IR methods. The results indicate the formation of a 1:2 charge-transfer complex with formula((TACTD)(TNP)2).The charge-transfer absorption in this complex appears arounds 410 nm.The values of both the equilibrium constant, K, and the molar extinction coefficient,€ , for the reaction in different solvents are calculated for the CT-complex. These values were used to understand the solvent effects on the course of the reaction. All observed infrared bands for the formed solid complex are assigned.
A spectrophotometric study of Au(III), Y(III) and Pd(II) complexes of a reagent 7‐(2‐pyridylazo)‐5‐chloro‐8‐hydroxyquinoline (PACHQ) is presented. Gold(III) forms a 2:1 (L:M) violet complex at pH 9.5 (50% ethanol), while Y(III) and Pd(II) form 2:1 (L:M) red complexes at pH 6.5 and 7.5 respectively. The stability of these complexes has been determined. Beer's law is valid over the concentration range 0‐7.87, 0‐8.89 and 0‐10.64μg ml−1 for Au(III), Y(III) and Pd(II) respectively. A number of foreign ions were tested for their interference. Synthetic solutions identical in composition to some Au(III) and Y(III) alloys are used to ascertain the suitability of the reagent.
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