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Pregled bibliografske jedinice broj: 685215

Časopis

Autori: Mihelj, Tea; Tomašić, Vlasta; Biliškov, Nikola; Liu, Feng
Naslov: Temperature-dependent IR spectroscopic and structural study of 18-crown-6 chelating ligand in the complexation with sodium surfactant salts
( Temperature-dependent IR spectroscopic and structural study of 18-crown-6 chelating ligand in the complexation with sodium surfactant salts )
Izvornik: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy (1386-1425) 124 (2014); 12-20
Vrsta rada: članak
Ključne riječi: 18-crown-6 ether; IR spectroscopy; X-ray diffraction; anionic surfactants; thermal properties; liquid crystals
( 18-crown-6 ether; IR spectroscopy; X-ray diffraction; anionic surfactants; thermal properties; liquid crystals )
Sažetak:
18-crown-6 ether (18C6) complexes with the following anionic surfactants: sodium n-dodecylsulfate (18C6-NaDS), sodium 4-(1-pentylheptyl)benzenesulfonate (18C6-NaDBS) ; and potassium picrate (18C6-KP) were synthesized and studied in terms of their thermal and structural properties. Physico-chemical properties of new solid 1:1 coordination complexes were characterized by infrared (IR) spectroscopy, thermogravimetry and differential thermal analysis, differential scanning calorimetry, X-ray diffraction and microscopic observations. The strength of coordination between Na+ and oxygen atoms of 18C6 ligand does not depend on anionic part of the surfactant, as established by thermodynamical parameters obtained by temperature-dependent IR spectroscopy. Each of these complexes exhibit different kinds of endothermic transitions in heating scan. Diffraction maxima obtained by SAXS and WAXS, refer the behavior of the compounds 18C6-NaDS and 18C6-NaDBS as smectic liquid crystalline. Distortion of 18C6-NaDS and 18C6-KP complexes occurs in two steps. Temperature of the decomplexation of solid crystal complex 18C6-KP is considerably higher than of mesophase complexes, 18C6-NaDS, and 18C6-NaDBS. The structural and liquid crystalline properties of novel 18-crown-ether complexes are function of anionic molecule geometry, type of chosen cation (Na+, K+), as well as architecture of self-organized aggregates. A good combination of crown ether unit and amphiphile may provide a possibility for preparing new functionalized materials, opening the research field of ion complexation and of host-guest type behavior.
Projekt / tema: 098-0982904-2927, 098-0982915-2949
Izvorni jezik: eng
Rad je indeksiran u
bazama podataka:
Current Contents Connect (CCC)
MEDLINE
Scopus
SCI-EXP, SSCI i/ili A&HCI
Science Citation Index Expanded (SCI-EXP) (sastavni dio Web of Science Core Collectiona)
Kategorija: Znanstveni
Znanstvena područja:
Kemija
URL Internet adrese: http://dx.doi.org/10.1016/j.saa.2013.12.092
http://www.sciencedirect.com/science/article/pii/S1386142513015230
http://ac.els-cdn.com/S1386142513015230/1-s2.0-S1386142513015230-main.pdf?_tid=c83d36ae-8370-11e3-a498-00000aab0f01&acdnat=1390400797_bb36ab74590380f99129896a0e7ef800
Broj citata:
Altmetric:
DOI: 10.1016/j.saa.2013.12.092
URL cjelovitog teksta: http://dx.doi.org/10.1016/j.saa.2013.12.092
Google Scholar: Temperature-dependent IR spectroscopic and structural study of 18-crown-6 chelating ligand in the complexation with sodium surfactant salts
Upisao u CROSBI: Tea Mihelj (Tea.Mihelj@irb.hr), 21. Sij. 2014. u 19:44 sati



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