STUDIUL SPECTROFOTOMETRIC AL COMPUŞILOR COORDINATIVI AI COBALTULUI(II), NICHELULUI(II) ŞI CUPRULUI(II) CU TIOSEMICARBAZONA ALDEHIDEI 5-(METILENTRIMETILAMONIU)SALICILICE

Angela SÎRBU Universitatea de Stat din Moldova

Abstract

SPECTROPHOTOMETRIC STUDY OF COORDINATIVE COMPOUNDS OF COBALT(II), NICKEL(II) AND COPPER(II) WITH 5-(METHYLENETRIMETYLAMONIUM)SALICYLALDEHYDE THIOSEMICARBAZONE

The 5-(methylenetrimethylamonium)salicylaldehyde thiosemicarbazone ([H2L]Cl) has an ionic structure, water soluble, forming colored compounds with cobalt(II), nickel(II) and copper(II), spectral characterized by maximum absorption of 390 nm, 373 nm and 375 nm. Molar ratio of metal:ligand is 1:1 for copper and nickel, and 1:2 for cobalt. The optimal conditions, molar absorptivity and stability of the dominant species were determined by spectrophotometric study. Based on this study has been proposed a method of determination copper and cobalt with new ionic reagent. Keywords: coordinative compounds, copper, cobalt, optical properts, thiosemicarbazone.