KFU. Card publication. Paramagnetic Relaxation Enhancement in Hydrophilic Colloids Based on Gd(III) Complexes with Tetrathia- and Calix[4]arenes

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PARAMAGNETIC RELAXATION ENHANCEMENT IN HYDROPHILIC COLLOIDS BASED ON GD(III) COMPLEXES WITH TETRATHIA- AND CALIX[4]ARENES

Form of presentation

Russian monographs

Year of publication

2020

Authors, employees of KFU

Dovzhenko Aleksey Pavlovich, author

Zairov Rustem Ravilevich, author

Other authors

Pizzanelli S., Nizameev I., Orekhov A., Arkharova N., Podyachev S., Sudakova S., Mustafina A., Caluccic L.

Authors, postgraduates KFU

Dovzhenko Aleksey Pavlovich, postgraduate kfu

Bibliographic description in the original language

Zairov R., Pizzanelli S., Dovzhenko A., Nizameev I., Orekhov A., Arkharova N., Podyachev S., Sudakova S., Mustafina A., Caluccic L., Paramagnetic Relaxation Enhancement in Hydrophilic Colloids Based on Gd(III) Complexes with Tetrathia- and Calix[4]arenes // The Journal of Physical Chemistry S ? 2020. (DOI: 10.1021/acs.jpcc.0c00312)

Annotation

Hydrophilic colloids (PSS-[Ln2(TCAi)2] and PSS-[LnCAi], with i = 1, 2, 3 and Ln=Gd, Tb) were prepared by precipitation of Gd(III) or Tb(III) complexes with tetrathiacalix[4]arenes (TCAi) and calix[4]arenes bearing two 1,3-diketone groups (CAi) from dimethyl formamide to an aqueous solution of poly(sodium 4- tyrenesulfonate) (PSS). Dynamic Light Scattering and Transmission Electron Microscopy demonstrated the formation of nanoparticles coated by the polymer. Luminescence decay measurements on Tb(III)-based colloids allowed a hydration number of 2 and 4 per metal ion to be determined for PSS-[Ln2(TCAi)2] and PSS-[LnCAi] samples, respectively. Longitudinal and transverse water proton relaxivity values measured at 20.8 MHz were remarkably high for the PSS-[GdCAi] colloids, but unexpectedly low for the PSS-[Gd2(TCAi)2] ones. 1H Fast Field Cycling NMR relaxometry was applied to shed light on the origin of the different relaxation enhancement in the investigated systems. Extremely slow exchan

Keywords

Paramagnetic Relaxation, polyelectrolyte nanoparticles, hydration number,

Place of publication

2020

Publishing house

American Chemical Society

URL

10.1021/acs.jpcc.0c00312

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=277668&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Dovzhenko Aleksey Pavlovich	ru_RU
dc.contributor.author	Zairov Rustem Ravilevich	ru_RU
dc.contributor.author	Dovzhenko Aleksey Pavlovich	ru_RU
dc.date.accessioned	2020-01-01T00:00:00Z	ru_RU
dc.date.available	2020-01-01T00:00:00Z	ru_RU
dc.date.issued	2020	ru_RU
dc.identifier.citation	Zairov R., Pizzanelli S., Dovzhenko A., Nizameev I., Orekhov A., Arkharova N., Podyachev S., Sudakova S., Mustafina A., Caluccic L., Paramagnetic Relaxation Enhancement in Hydrophilic Colloids Based on Gd(III) Complexes with Tetrathia- and Calix[4]arenes // The Journal of Physical Chemistry � ? 2020. (DOI: 10.1021/acs.jpcc.0c00312)	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=277668&p_lang=2	ru_RU
dc.description.abstract	Hydrophilic colloids (PSS-[Ln2(TCAi)2] and PSS-[LnCAi], with i = 1, 2, 3 and Ln=Gd, Tb) were prepared by precipitation of Gd(III) or Tb(III) complexes with tetrathiacalix[4]arenes (TCAi) and calix[4]arenes bearing two 1,3-diketone groups (CAi) from dimethyl formamide to an aqueous solution of poly(sodium 4- tyrenesulfonate) (PSS). Dynamic Light Scattering and Transmission Electron Microscopy demonstrated the formation of nanoparticles coated by the polymer. Luminescence decay measurements on Tb(III)-based colloids allowed a hydration number of 2 and 4 per metal ion to be determined for PSS-[Ln2(TCAi)2] and PSS-[LnCAi] samples, respectively. Longitudinal and transverse water proton relaxivity values measured at 20.8 MHz were remarkably high for the PSS-[GdCAi] colloids, but unexpectedly low for the PSS-[Gd2(TCAi)2] ones. 1H Fast Field Cycling NMR relaxometry was applied to shed light on the origin of the different relaxation enhancement in the investigated systems. Extremely slow exchan	ru_RU
dc.language.iso	ru	ru_RU
dc.publisher	American Chemical Society	ru_RU
dc.subject	Paramagnetic Relaxation	ru_RU
dc.subject	polyelectrolyte nanoparticles	ru_RU
dc.subject	hydration number	ru_RU
dc.subject		ru_RU
dc.title	Paramagnetic Relaxation Enhancement in Hydrophilic Colloids Based on Gd(III) Complexes with Tetrathia- and Calix[4]arenes	ru_RU
dc.type	Russian monographs	ru_RU