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1.
We found that the PVC membrane, containing azo calix[4]arene is a suitable ionophore, exhibited a Nernstian response for neodymium (Nd3+) ions (with slope of 19.8 ± 0.2 mV decade−1 for the triply charged ion) over a wide linear range of 4.0 × 10−8 to 1.0 × 10−1 mol L−1 with a detection limit 1.0 × 10−8 mol L−1, a relatively fast response time, in the whole concentration range (<10 s), and a considerable life time at least for four months in the pH range of 4.0-8.0. Furthermore, the electrode revealed high selectivity with respect to all the common alkali, alkaline earth, transition and heavy metal ions, including the members of the lanthanide family other than Nd3+. Concerning its applications, it was effectively employed for the determination of neodymium ions in industrial waste water as well as in lake water. 相似文献
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Zouhair Asfari Sebastiano Pappalardo J. Vicens 《Journal of inclusion phenomena and macrocyclic chemistry》1992,14(2):189-192
A doubly-crowned calix and a double-calixcrown derived from 4,6,10,12,16,18,22,24,25,26,27, 28-dodecamethyl-5,11,17, 23-tetrahydroxycalix[4]arene (1) have been prepared by reaction of appropriate oligoethylene glycol ditosylates with (1) in acetonitrile in the presence of potassium carbonate. A potassium template effect is observed during one of the double cyclizations. 相似文献
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WANG KeRang GUO DongSheng JIANG BangPing & LIU Yu State Key Laboratory of Elemento-Organic Chemistry 《中国科学B辑(英文版)》2009,(4)
A novel calix[4]arene derivative with pyrene fluorophores at the upper rim and tetraester ionophores at the lower rim was synthesized in six steps,and its structure was proved by NMR and ESI-MS spectro-scopies. Furthermore,the chemosensing behavior of the host compound for alkali and alkaline earth metal ions was investigated by fluorescence spectroscopy. The obtained results show that the calix-arene host can selectively bind sodium ion with the complexation stability constant of 2190 mol-1.L. The complexa... 相似文献
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Peter Timmerman Sybolt Harkema Gerrit J. Van Hummel Willem Verboom David N. Reinhoudt 《Journal of inclusion phenomena and macrocyclic chemistry》1993,16(2):189-197
The formation of a stable calix[4]arene monohemiketal is described. X-ray crystallographic data provide conclusive evidence for the presence of a stabilizing hydrogen bond.
Supplementary Data. Lists of H-atom parameters and bond lengths and angles involving hydrogens have been deposited with the British Library Document Supply Centre as Supplementary Publication No. SUP 82159 (5 pp.). 相似文献
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Guomei Zhang Yinghui Li Shaomin Shuang Martin M.F. Choi 《Supramolecular chemistry》2013,25(8):747-753
A plasticised poly(vinyl chloride) optode membrane incorporated with a calix[6]arene hexaester, a H+-selective chromoionophore (3,3′,5,5′-tetramethyl-N,N-dibenzylbenzidine, a novel synthetic cationic dye) and a lipophilic potassium tetrakis(4-chlorophenyl)borate was used as a sensing device for the indirect optical determination of potassium ions. It exhibited a reversible response to the potassium ion in 0.05 mol/l HCl buffer media in the concentration range from 1 × 10? 6 to 1 × 10? 2 mol/l. The linear range was from 1.53 × 10? 5 to 3.20 × 10? 3 mol/l. The proposed optode sensor exhibited a fast response of less than 1 min, good repeatability (n = 7, RSD = 3.62%) at 5 × 10? 5 mol/l, and long-term stability with 92% of its initial sensitivity after 1 month of storage. The selectivity of the potassium-selective membrane allows its application for the detection of the potassium concentration in real sample analysis. The result was satisfactory compared with atomic absorption spectrometry. 相似文献
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Y. Shibutani H. Yoshinaga K. Yakabe T. Shono M. Tanaka 《Journal of inclusion phenomena and macrocyclic chemistry》1994,19(1-4):333-342
Six kinds of tetra alkylester type calix[4]arene derivatives, (R1=R2=CH31, C2H52, C3H73,n-C4H94,t-C4H95,n-C10H216), a diethyl-didecyl mixed ester type (R1=C2H5, R2 =C10H217), and three kinds of lower rim bridged types (R1=C2H5, R2–R2=(CH2)108, (CH2)129, (CH2)2(OCH2CH2)310) were characterized by electrochemical measurement to elucidate the effect of the length of the alkyl group of alkoxycarbonyl substituents on Na+ selectivity. To obtain excellent Na+ selective ionophores, introduction of short chain alkyl groups rather than long chain ones, such as a decyl group, and maintenance of sufficient solubility of the calix[4]arene derivatives in the membrane solvent are required concurrently. Among the calix[4]arenes tested, 25,26,27,28-tetrakis[(ethoxycarbonyl)methoxy]-p-tert-butylcalix[4]arene2, and the diethyl-didecyl mixed ester type derivative7 are the best ionophores for a Na+ selective electrode. On the other hand, sodium selectivity of the bridged type derivative9 is comparable or even superior to that of the known bis(12-crown-4).This paper is dedicated to the commemorative issue on the 50th anniversary of calixarenes. 相似文献
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The bis(calix [4] arene)3 was synthesized in moderate yield by the reaction of p-tert-butylcalix [4] arene (1) with 1,4-bis(chloromethyl) benzene (2). The conformation of all alkylated product 4 was investigated by the variable-temperature ^1H-NMR. 相似文献
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Mercedes Vázquez Johan Bobacka Minna Luostarinen Kari Rissanen Andrzej Lewenstam Ari Ivaska 《Journal of Solid State Electrochemistry》2005,9(5):312-319
Potentiometric ion sensors have been prepared by galvanostatic electrosynthesis of the conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) doped with p-sulfonated calix[4]arene (C[4]S) and p-methylsulfonated calix[4]resorcarenes (Rn[4]S) with alkyl substituents of different chain length (R1=CH3; R2=C2H5; R3=C6H13). The bowl-shape of these doping ions makes them suitable as ionic recognition sites, and their bulky character is expected to prevent them from leaching out of the conducting polymer membrane. For comparison, sensors based on PEDOT doped with poly(styrene sulfonate) (PSS) and poly(vinyl sulfonate) (PVS) were also constructed. The resulting GC/PEDOT electrodes were conditioned in 0.01 mol L–1 AgNO3 and their performance as Ag+ ion-selective electrodes (ISEs) studied. Results reveal that selectivity and lifetime of the electrodes is affected by the doping anion structure, although all electrodes show selectivity towards Ag+ ions. Interaction of Ag+ with sulfur atoms present in the conducting polymer backbone is considered to be the main reason for this behavior. A second set of electrodes was constructed and conditioned in 0.1 mol L–1 KCl. These electrodes were tested in chloride solutions of quaternary ammonium cations, showing that C[4]S and R2[4]S exhibit significant sensitivity towards pyridinium.Dedicated to Professor György Horányi on the occasion of his 70th birthday in recognition of his outstanding contributions to electrochemistry 相似文献
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A new idea of the nanorods preparation and a novel application of calixarenes are presented. Calix[4]arene was introduced
into solvothermal system to produce one-dimensional inorganic nanomaterial. The obtained product was characterized by XRD
and TEM. Results of the XRD analysis showed that the product was pure cubic phase of PbS with high crystallinity. TEM images
revealed that the diameter and length of the PbS nanorods were about 200 nm and up to 3.5 μm, respectively. Optical properties
of the product were also studied. PL emission image showed that the product exhibited an emission peak at 308 nm in ultraviolet
region showing a blue shift of 14 nm compared to the bulk material. The formation mechanism of PbS nanorods in the presence
of calix[4]arene is discussed. 相似文献
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Abdelhalim Guelzim Mohamed Saadioui Zouhair Asfari Jacques Vicens 《Journal of inclusion phenomena and macrocyclic chemistry》2001,39(1-2):91-95
The synthesis of25-[2-(ethoxy-1-p-toluene-sulfonate)phenyl]-26,27,28-trihydroxy calix[4]arene3 as a byproduct of the preparation of 1,3-dialkylated25,27-di-[2-(ethoxy-1p-toluene-sulfonate)phenyl]-26,28-dihydroxy calix[4]arene 2 is reported. Compound 3 is a monoalkylatedcalix[4]arene in the cone conformation. The X-ray structure of 3 showed that this conformation is stabilized by intramolecular hydrogen bonding. 相似文献
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Two new PVC membrane electrodes that are highly selective to Ag(I) ions were prepared using (L1) calyx[4]arene (L2) as two suitable neutral carriers. The silver(I) ion selective electrodes exhibit a good response for silver ion over a wide
concentration range of 1.0 × 10−1 to 4.2 × 10−6 M (L1) and 1.0 × 10−1 to 6.5 × 10−6 M (L2) with a Nernstian slope of 60 mV per decade (L1) and 58 mV per decade (L2) at 25°C, and was found to be very selective, precise, and usable within the pH range 4.0–8.0. They have a response time
of <15 s and can be used for at least 3 months without any measurable divergence in potential. The proposed sensors show a
fairly good discriminating ability towards Ag+ ion in comparison to some hard and soft metal ions. The electrodes were used as indicator electrodes in the potentiometric
titration of silver ion and in the determination of Ag+ in photographic emulsion and radiographic and photographic films.
Published in Russian in Elektrokhimiya, 2009, Vol. 45, No. 7, pp. 862–868.
The article is published in the original. 相似文献
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Ferhat Kaykal Haluk Bingol Ahmet B. Sariguney Ahmet Coskun 《Supramolecular chemistry》2013,25(8):570-578
The alkali metal ion transfers facilitated by a novel calix[4]arene derivative (OPEC) across the water/1,2-dichloroethane (1,2-DCE) micro-interface supported at the tip of a micropipette were presented. The well-defined voltammetric behaviours except Cs+ was obtained by cyclic voltammetry and differential pulse voltammetry. The bulk concentration of metal ions was much higher than that of OPEC in the performed measurements. The diffusion coefficient of OPEC in the 1,2-DCE phase was calculated as 5.18 ± 0.70 × 10? 6 cm2 s? 1. On the basis of the changes of the half-wave transfer potentials, the logarithms of the association constants having 1:1 ionophore–ion complex stoichiometry for Li+, Na+, K+ and Rb+ in 1,2-DCE were determined as 4.80, 4.62, 4.98 and 5.32, respectively. The facilitated ion transfers were also evaluated by the Randles equivalent circuit used for ac-impedance data analysis. 相似文献
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5-碘[杯(4)芳烃偶氮]氨基喹啉光度法测钯 总被引:1,自引:0,他引:1
合成了新试剂5 碘[杯(4)芳烃偶氮]氨基喹啉(ICAQ),并研究了该试剂与钯显色反应条件。结果表明,在pH10.2~11.0的Na2CO3 NaHCO3缓冲介质中,在TritonX 100存在下,试剂与钯发生显色反应,生成1∶1稳定络合物。建立了测定钯的光度法新体系,λmax=625nm,ε=1.42×105L·mol-1·cm-1,钯质量浓度在0~0 80μg/mL内符合比尔定律。方法用于钯催化剂中钯的测定,结果与原子吸收法相符,平行6次测定的RSD在2.5%~3.0%。 相似文献
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Sabine Wenger Zouhair Asfari Jacques Vicens 《Journal of inclusion phenomena and macrocyclic chemistry》1994,20(2):151-156
We describe the condensation of an appropriate tetraaldehyde derivative of mesitol calix[4]arene with 1,n-diaminoalkanes to afford double Schiff-base calix[4]arene receptors in the 1,3-alternate conformation. 相似文献