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Complex nuclear relaxation processes in guanidinium compounds [C(NH2)3]3Sb2X9 (X= Br, Cl): effects of quadrupolar interactions.
Autorzy
Rok wydania
2010
Czasopismo
Numer woluminu
39
Strony
233-249
DOI
10.1007/s00723-010-0152-x
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Temperature dependences of proton spin–lattice relaxation times for twoguanidinium compounds, [C(NH2)3]3Sb2Br9and [C(NH2)3]3Sb2Cl9, are reanalyzedby taking into account all relaxation pathways available for protons. It turns out thatthe experimental data reflect two relaxation processes, which have to be describedseparately. The bi-exponentiality of relaxation results from the structure of thesecompounds, which contain two structurally and dynamically distinct guanidiniumcations. Complete relaxation formulas accounting for effects of the quadrupolarinteractions on the energy level structure of the entire system, as well as of thequadrupolar relaxation, are applied. This advanced description allows for a con-sistent interpretation of the relaxation data assuming the simplest motional model(one thermally activated correlation time for every guanidinium cation) while for-mer attempts based on very simple relaxation formulas but including sophisticatedmotional models failed. The presented relaxation description and the analysis ofthe relaxation data can serve as an example of a complete treatment of relaxation
Adres publiczny
http://dx.doi.org/10.1007/s00723-010-0152-x
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