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New complexons. IX. Preparation and a spectrophotometric study of formation of complexes with 1,3-diamino-propan-2-ol-N,N,N',N'-tetraacetic acid

V. Špringer, J. Majer, and B. Kopecká

Department of Analytical Chemistry, Faculty of Pharmacy, Komenský University, Bratislava

 

Abstract: A new procedure to synthetize l,3-diaminopropan-2-ol-N,N,N',N'-tetraacetic acid (DPOTA) is described. So far, only the patented route [5] has been known. Furthermore, both the formation of DPOTA-complexes with Cu2+ , Ni2+, Co2+ , Pb2+ , Fe3+ and their composition is studied by means of spectrophotometric methods. The ratio of the complexes composition was found to be 1 : 1 with the exception of Pb2+ complex, where the ratio was determined as 1 : 2 in favour to the complexing reagent [6, 7]. The paper deals also with the stability constant measurements. The   respective stability constants of the observed complexes with DPOTA are 2—5 logarithm К units lower than those with ethylenediaminetetraacetic acid (EDTA). This phenomenon is due to the formation of a six-member ring of the DPOTA complexes, whereas the EDTA complexes are five-membered. The stability constants of the Pb2+ complex with DPOTA were reported earlier [6, 7].

Full paper in Portable Document Format: 217a481.pdf (in Slovak)

 

Chemical Papers 21 (7) 481–490 (1967)

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