Napredna pretraga

Pregled bibliografske jedinice broj: 765778

Extraction and complexation of alkali and alkaline earth metal cations by lower-rim calix[4]arene diethylene glycol amide derivatives


Sviben, Igor; Galić, Nives; Tomišić, Vladislav; Frkanec, Leo
Extraction and complexation of alkali and alkaline earth metal cations by lower-rim calix[4]arene diethylene glycol amide derivatives // New journal of chemistry, 39 (2015), 6099-6107 doi:10.1039/C5NJ00805K (međunarodna recenzija, članak, znanstveni)


Naslov
Extraction and complexation of alkali and alkaline earth metal cations by lower-rim calix[4]arene diethylene glycol amide derivatives

Autori
Sviben, Igor ; Galić, Nives ; Tomišić, Vladislav ; Frkanec, Leo

Izvornik
New journal of chemistry (1144-0546) 39 (2015); 6099-6107

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Calix[4]arene; ethylene glycol; complexation; stability constant; extraction

Sažetak
Novel calix[4]arene derivatives, 5, 11, 17, 23- tetra-tert-butyl-25, 26, 27, 28-tetrakis(N-(2- (2- methoxyethoxy)ethyl)carbamoyl methoxy)calix[4]arene (1) and 5, 11, 17, 23- tetra- tert-butyl-25, 26, 27, 28-tetra(N, N- bis(2-(2- methoxyethoxy)ethyl)carbamoyl methoxy)calix[4]arene (2), were prepared by introducing diethylene glycol subunits at the lower calixarene rim. The complexation affinities of these compounds towards alkali and alkaline earth metal cations were studied at 25 °C in acetonitrile and methanol by means of spectrophotometric, conductometric, and potentiometric titrations. The stability constants of the corresponding complexes with 1 : 1 (cation : ligand) stoichiometry were determined (in some cases only estimated), and their values obtained by different methods were in good agreement. The complexes with secondary-amide derivative (1) were observed to have much lower stabilities than those with tertiary-amide derivative (2). This was presumably mostly caused by the presence of intramolecular NHO[double bond, length as m- dash]C hydrogen bonds in the former case. It was found that solvent significantly affected the stability of the complexes ; the prepared calixarenes showed considerably higher affinities for cations in acetonitrile than in methanol. Generally, the ligands studied showed better binding abilities for alkaline earth cations than for alkali metal cations. The extraction of metal picrates from water to dichloromethane by the complexation of metal ions with ligands 1 and 2 was also investigated. In accordance with the complex stabilities, all cations were extracted fairly well (in some cases even excellently) with the tertiary-amide derivative, whereas this was not the case in the extraction experiments with the other ligand studied.

Izvorni jezik
Engleski

Znanstvena područja
Kemija



POVEZANOST RADA


Projekt / tema
HRZZ-IP-2013-11-7387 - Supramolekulska sinteza samo-organizirajućih funkcionalnih nanomaterijala i kompleksnih kemijskih sustava (Leo Frkanec, )
HRZZ-IP-2014-09-7309 - razvoj supramolekulskih receptora kationa i aniona (Vladislav Tomišić, )

Ustanove
Institut "Ruđer Bošković", Zagreb,
Prirodoslovno-matematički fakultet, Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


Citati