13C-dipole dipole relaxation time and internal motions of oligo cyclicethers and ether-esters. Part IV. The mechanism and activation energies of the ring Pseudorotation of 15.Crown.5, 18.Crown.6 and 2,6-dioxo-18.crown.6.

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dc.contributor.authorErk, Çakıl
dc.date.accessioned2024-04-24T17:56:06Z
dc.date.available2024-04-24T17:56:06Z
dc.date.issued1989
dc.departmentDicle Üniversitesi, Fen ve Edebiyat Fakültesi, Kimya Bölümüen_US
dc.description.abstractThe 13C dipole-dipole relaxation time values of 1,4,7,10,13- pentaoxacyclopentadecane,(15.Crown.5) and 1,4,7,10,13,16-hexaoxa cyclooctadecane,(18.crown.6) in CDCl3 and 2,6-dioxo-1,4,7,10,13,16 -hexaoxacycloctadecane,(2,6-do-18.crown.6) were determined in CD2Cl2 at 15 MHz of various temperatures by inversion recovery method. The results observed in frequency range of (WO+WH2T2«1 extreme narrowing conditions were explained in terms of internal motions of macrocyclic backbone and the ring isomerization. The free energies obtained from the 13C dipole-dipole relaxation time measurments were assigned properly to the pseudorotation rate and the conformational barrier of the oxyethylene groups of the macrocyclic ethers and ether-ester. The segmental motion CC and CO bonds of dioxo-hexaoxa ether, observed as the specific TDD1 and energy barrier of different 13C nuclei was also discussed.en_US
dc.identifier.citationErk, Ç. (1989). 13C-dipole dipole relaxation time and internal motions of oligo cyclicethers and ether-esters. Part IV. The mechanism and activation energies of the ring Pseudorotation of 15.Crown.5, 18.Crown.6 and 2,6-dioxo-18.crown.6. Journal of Molecular Liquids, 40(1), 1-15.
dc.identifier.doi10.1016/0167-7322(89)80046-7
dc.identifier.endpage15en_US
dc.identifier.issn0167-7322
dc.identifier.issue1en_US
dc.identifier.scopus2-s2.0-0011569751
dc.identifier.scopusqualityQ1
dc.identifier.startpage1en_US
dc.identifier.urihttps://doi.org/10.1016/0167-7322(89)80046-7
dc.identifier.urihttps://hdl.handle.net/11468/23282
dc.identifier.urihttps://www.sciencedirect.com/science/article/abs/pii/0167732289800467?via%3Dihub
dc.identifier.volume40en_US
dc.indekslendigikaynakScopus
dc.institutionauthorErk, Çakıl
dc.language.isoenen_US
dc.relation.ispartofJournal of Molecular Liquids
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.title13C-dipole dipole relaxation time and internal motions of oligo cyclicethers and ether-esters. Part IV. The mechanism and activation energies of the ring Pseudorotation of 15.Crown.5, 18.Crown.6 and 2,6-dioxo-18.crown.6.en_US
dc.title13C-dipole dipole relaxation time and internal motions of oligo cyclicethers and ether-esters. Part IV. The mechanism and activation energies of the ring Pseudorotation of 15.Crown.5, 18.Crown.6 and 2,6-dioxo-18.crown.6.
dc.typeArticleen_US

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