Conclusions
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1.
The study of the processes of acid dissociation revealed that 1,4,7,10-tetrakis(dihydroxyphosphorylmethyl)-1,4,7,10-tetraazacyclododecane has a dibetaine structure, that 1,5,8,12-tetrakis(dihydroxyphosphorylmethyl)-1,5,8,12-tetraazacyclotetradecane has a tribetaine structure, and that the betaine protons dissociate last.
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2.
When complexes of 1,4,7,10-tetrakis(dihydroxyphosphorylmethyl)-1,4,7,10-tetrazacyclododecane and 1,5,8,12-tetrakis(dihydroxyphosphorylmethyl)-1,5,8,12-tetraazacyclotetradecane with divalent copper are formed in an aqueous solution, all the nitrogen atoms in the ring, as well as one or two phosphonic groups, participate in the coordination over a broad range of pH values.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2080–2088, September, 1988.
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Pasechnik, M.P., Solodovnikov, S.P., Matrosov, E.I. et al. Dissociation of 1, 4,7,10-tetrakis(dihydroxyphosphorylmethyl)-1,4, 7,10-tetraazacyclododecane and 1,5,8,12-tetrakis-(dihydroxyphosphorylmethyl)-1,5,8,12-tetraazacyclotetradecane and their complexation with divalent copper. Russ Chem Bull 37, 1866–1873 (1988). https://doi.org/10.1007/BF00962504
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DOI: https://doi.org/10.1007/BF00962504