Abstract
A simple ,accurate and sensitive spectrophotometric method has been developed the determination of Cobalt(II) and Cupper (II) .The method is based on the chelation of Co(II) and Cu(II) ions with 4-(4´-pyrazolon azo) -2-Naphthol(APAN) in aqueous medium . The complexes have a maximum absorption at (513) and (506) nm and ? max 0.531×10 4 and 0.12×10 5 L.mol -1.cm -1 for Co(II) and Cu(II) respectively .The reagent and two complexes have been prepared in ethanolic solution.The stoichiometry of both complexes were found to be 1:2 (metal :legend) .The effects of various cations and anions on Co(II) and Cu(II) determination have been investigated .The stability constants and standard deviations for Co(II) and Cu(II) 0.291 x107 ,0.909X108 L.mol -1 ,(0.291) and (0.332) respectively .The optimum condition for full color development for described methods were applied satisfactorily to synthetic samples.
Highlights
Pyrazolne moiety[1].Metal complexes of azo compounds containing hetero aryl ring systems find various applications .These type of molecules have several advantages,for example the azo group is photo cromic,redox responsive,stability low valent metal oxidation states due to the presence of a low –lying azo centered π*molecular or bital serves as a molecular switch is used as ametal ion indicator,dyes and pigments in industry [2].Copper is anutitionally essential metal and is widely distributed in nature,Cobalt is an important essential micronutrient for all living systems [3]
As well as these two ions were studied by many researchers [4],estimated by these two ions in the samples biologic and environmental[5].At present,a lot of analytical methods have been proposed for the determination copper (II) and cobalt (II),inductively coupled plasma mass spectrometry
Experimental Part All chemical used were of analytical grade A- Preparation of reagent (APAN)
Summary
Pyrazolne moiety ( a five- membered lactam ring alternatively a derivative of pyrazole possessing an additional carbonyl /hydroxyl group )[1].Metal complexes of azo compounds containing hetero aryl ring systems find various applications .These type of molecules have several advantages ,for example the azo group is photo cromic ,redox responsive,stability low valent metal oxidation states due to the presence of a low –lying azo centered π*molecular or bital serves as a molecular switch is used as ametal ion indicator ,dyes and pigments in industry [2].Copper is anutitionally essential metal and is widely distributed in nature ,Cobalt is an important essential micronutrient for all living systems [3] As well as these two ions were studied by many researchers [4],estimated by these two ions in the samples biologic and environmental[5].At present ,a lot of analytical methods have been proposed for the determination copper (II) and cobalt (II) ,inductively coupled plasma mass spectrometry A diazonium solution was prepared by taking 1.0g , 0.004 mol 4amino antipyrin in 25 ml of ethanol and 5ml concentrated hydrochloric acid with 15 ml of distilled water ,and adding sodium nitrite solution dropwise at 0-5۫C° ,2-Napthol 0.0083 mol 1.2 g was dissolved in 50 ml of ethanol and 35 ml of (4N) NaOH were added at (0-5C°) .The mixture was allowed to stand and added 20%HCl solution .The precipitate was filtered off and recrystallized from ethanol [10] scheme 1
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