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NMR self-diffusion study of a phosphonium bis(mandelato)borate ionic liquid
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Industriell miljö- och processteknik.ORCID-id: 0000-0002-6810-1882
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Industriell miljö- och processteknik.ORCID-id: 0000-0003-3652-7798
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Industriell miljö- och processteknik.ORCID-id: 0000-0001-5149-378X
Vise andre og tillknytning
2013 (engelsk)Inngår i: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 15, nr 23, s. 9281-9287Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Newly synthesized halogen-free boron based ionic liquids (hf-BILs) composed of chelated orthoborate anionsand phosphonium cations have hydrolytic stability, low melting point and outstanding wear and frictionreducing properties. We report here the peculiarities of self-diffusion in one representative from this class,trihexyltetradecylphosphonium bis(mandelato)borate, [P6,6,6,14][BMB], in the temperature range of itspractical interest, 20–100 1C. NMR techniques demonstrated complicated diffusional behaviour – the ionicliquid can exist in one or two liquid ‘‘phases’’. In the low-temperature range (20–50 1C), two phases coexistwhere the cations, [P6,6,6,14], are contained mainly in the phase with slower diffusion coefficients while theanions, [BMB], are in the phase with faster diffusion coefficients. Cations have lower diffusion coefficientswith a factor of 20 as compared with the anions, an effect which is caused by aggregation of cations intodomains due to so-called ‘‘hydrophobic interaction’’ of their hydrocarbon chains. As the temperature risesabove 60 1C, the two phases merge into one where both ions have equal diffusion coefficients. This iscaused by thermal motion making the cation domains smaller in size and more easily interacting withanions. As a result, anions and cations diffuse in this high-temperature range as a pair.

sted, utgiver, år, opplag, sider
2013. Vol. 15, nr 23, s. 9281-9287
Emneord [en]
Ionic liquid, self-diffusion, Chemistry - Organic chemistry
Emneord [sv]
Kemi - Organisk kemi
HSV kategori
Forskningsprogram
Gränsytors kemi
Identifikatorer
URN: urn:nbn:se:ltu:diva-3456DOI: 10.1039/C3CP51132DISI: 000319285000048PubMedID: 23661052Scopus ID: 2-s2.0-84878064165Lokal ID: 14749ff0-b757-4764-bb65-ba35cfe7a272OAI: oai:DiVA.org:ltu-3456DiVA, id: diva2:976314
Merknad
Validerad; 2013; 20130506 (andfil)Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2018-07-10bibliografisk kontrollert

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Filippov, AndreiShah, Faiz UllahTaher, MamounGlavatskih, SergeiAntzutkin, Oleg

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