https://orcid.org/0000-0002-0214-6770
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Abstract
The processes of complexation of dicarboxylate diphosphabetaines with gadolinium nitrate were studied, as a result of which stable polymer metal complexes insoluble in inorganic and organic solvents were obtained. To carry out these reactions, dicarboxylate diphosphabetaines were previously synthesized: 3,3'-(propane-1,3-diylbis (diphenyl)phosphoniondiyl)dipropanoate and 3,3'-(hexane-1,3-diylbis (diphenyl)phosphoniondiyl)dipropanoate, based on maleic acid with 1,3-bis(diphenylphosphino)bisphosphinspropane and 1,6-bis(diphenylphosphino)bisphosphinshexane. The structure of dicarboxylate diphosphabetaines and poly-nuclear polymer complexes of gadolinium has been confirmed by modern physical and chemical methods of research, including NMR and IR spectra, elemental and X-ray structural analysis, thermal stability has been studied by simultaneous thermogravimetry and differential scanning calorimetry.
Graphical Abstract
Acknowledgements
This work was funded by the subsidy allocated to Kazan Federal University for the state assignment in the sphere of scientific activities no. 0671-2020-0063.