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Pregled bibliografske jedinice broj: 696211

Časopis

Autori: Mihelj, Tea; Tomašić, Vlasta; Biliškov, Nikola
Naslov: 18-crown-6-sodium cholate complex: thermochemistry, structure and stability
( 18-crown-6-sodium cholate complex: thermochemistry, structure and stability )
Izvornik: Langmuir (0743-7463) 30 (2014), 21; 6274-6285
Vrsta rada: članak
Ključne riječi: 18-crown-6; sodium cholate; structure; NMR; thermal behavior; IR spectroscopy
( 18-crown-6; sodium cholate; structure; NMR; thermal behavior; IR spectroscopy )
Sažetak:
18-crown-6, one of the most relevant crown ethers, and sodium cholate, steroidal surfactant classified as natural bile salt, are components of novel, synthesized coordination complex ; 18-crown-6-sodium cholate (18C6•NaCh). Like crown ethers, bile salts act as building blocks in supramolecular chemistry in order to design new functionalized materials with a desired structure and properties. In order to obtain thermal behavior of this 1:1 coordination complex, thermogravimetry and differential thermal analysis were used, as well as microscopic observations and differential scanning calorimetry. Temperature dependent infrared spectroscopy (IR) gave a detailed view into phase transitions. The structures during thermal treatment were observed with powder X-ray diffraction, and molecular models of the phases are made. Hard, glassy, colorless compound 18C6•NaCh goes through crystalline – crystalline polymorphic phase transitions at higher temperatures. The room temperature phase is indexed to a triclinic lattice, while in the high temperature phases molecules take randomly one of the two different configurations in the unit cell, resulting in the 2-fold symmetry. The formation of cholesteric liquid crystalline phase occurs simultaneously with partial decomposition, followed by the isotropisation with simultaneous and complete decomposition at much higher temperature, as obtained by IR. The results provide valuable information about the relationship between molecular structure, thermal properties, and stability of the complex, indicating the importance of an appropriate choice of cation, amphiphilic, and crown ether unit in order to synthesize compounds with desired behavior.
Projekt / tema: 098-0982915-2949, 098-0982904-2941
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
Puni text rada: 696211.la501155s.pdf (tekst priložen 21. Srp. 2014. u 15:53 sati)
URL Internet adrese: http://dx.doi.org/10.1021/la501155s
http://pubs.acs.org/doi/abs/10.1021/la501155s
Broj citata:
Altmetric:
DOI: 10.1021/la501155s
URL cjelovitog teksta:
Google Scholar: 18-crown-6-sodium cholate complex: thermochemistry, structure and stability
Upisao u CROSBI: Tea Mihelj (Tea.Mihelj@irb.hr), 8. Svi. 2014. u 09:41 sati



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