The study of New Complex Compounds of Ni (II) and Co (II) with N- hydroxy- succinimide and their potential applications as sensors

摘要

In this paper, the study of obtaining new coordination compounds of Ni (II) and Co(II) using as ligand, N-hydroxy-succinimide, was presented. Also, the stability constants of these compounds in aqueous medium were determined.rnThe obtaining conditions and the stability of the new compounds were accomplished in aqueous solutions using characteristic methods for coordination compounds: pH-metry, conductometry and UV-VIS absorption spectroscopy. The combination ratios and the stability constants were determined with methods characteristic for studies in solutions. From experimental data resulted that the combination ratio of central metallic atoms with the ligand N-hydroxy-succinimide was: 1:1 and respectively 1:2. In the experiments were used salts of NiCl_2-6H_O and CoCl_2-6H_2O.rnThe optimal domain of pH stability of the studied compounds is limited between 5.74 - 5.86 for Co-N-hydroxy-succinimide (for molar ratio 1:1 and 1:2) and respectively 5.69 - 5.87 for Ni-N-hydroxy-succinimide(for molar ratio 1:1 and 1:2, too).rnIt is important to mention that these compounds were used with very good results in determination of wastewaters from textile, metallurgical, chemical and food industry.rnComplexion reactions with this ligand are very sensitive for the cations in this paper mentioned. Therefore it is used most often with success in analytical chemistry and also it is posibil to use as sensors.rnThe new complex compounds has electronics transitions at X, = 517 nm for both complexes Co-N-hydroxy-succinimide at molar ratio 1:1 and 1:2 and also at the same X. = 397nm for Ni-N-hydroxy-succinimide at molar ratio 1:1 and 1:2.rnThese complexes compounds was separated and recrystallized from aqueous solution.rnFrom the spectrophotometric data it was determined the type and the nature of the electronics transitions by Dq parameters.