Reference

Synthesis and acid-base properties of calix[4]-, calix[6]- and calix[8]arene p-sulfonic acids

Synthesis and acid-base properties of calix[4]-, calix[6]- and calix[8]arene p-sulfonic acids.Some chemicals with cas registry numbers like 139553-72-3 and 74568-07-3 are also used. Scharff, Jean Pierre; Mahjoubi, Malika; Perrin, Robert (Lab. Phys.-Chim. Miner., Univ. Claude Bernard Lyon, Villeurbanne 69622, Fr.). New J. Chem., 15(12), 883-7 (English) 1991. CODEN: NJCHE5. ISSN: 0398-9836. DOCUMENT TYPE: Journal CA Section: 25 (Benzene, Its Derivatives, and Condensed Benzenoid Compounds) Water sol. calix[4], calix[6] and calix[8]arene p-sulfonic acids (I; n = 4, 6, 8) have been synthesized in the solid state in their protonated and hydrated forms. The acid-base behavior of these potential ligands H8A, H12B and H16C has been detd. in aq. solns. by pHmetric titrns. and compared with the case of the corresponding monomer which is the p-hydroxybenzenesulfonic acid H2D. All the protonation consts. have been estd. or quant. detd. for the first time. It appears that in I certain sulfonic groups become less acidic as the calixarene ring size increases. The same phenomenon is obsd. for the hydroxyl groups of I. .

Polymer waveguide biosensors with Bragg gratings

All Rights Reserved. Polymer waveguide biosensors with Bragg gratings. Oh, Min-Cheol; Kim, Kyung-Jo; Lee, Jae-Hyun; Koh, Kwang-Nak ( Electronic Engineering Dept., Pusan National Univ., Pusan, S. Korea). Proceedings of SPIE-The International Society for Optical Engineering, 6331(Linear and Nonlinear Optics of Organic Materials VI), 63310S/1-63310S/7 (English) 2006 SPIE-The International Society for Optical Engineering. 74568-07-3 and 104137-08-8 are cas registry numbers. These chemicals are also mentioned in this article. CODEN: PSISDG. ISSN: 0277-786X. DOCUMENT TYPE: Journal CA Section: 73 (Optical, Electron, and Mass Spectroscopy and Other Related Properties) Biophotonic sensors based on polymer waveguide with Bragg reflection grating are demonstrated in this work. Waveguide Bragg reflectors were designed by using the effective index method and the transmission matrix method. The grating pattern was formed by exposing laser interference pattern on a photoresist. On top of the inverted rib waveguide, the grating was inscribed into the core layer by the O2 plasma etching. In order to perform the bio-mol. detection expt., a calixarene mol. was self-assembled on top of thin Au film deposited on the waveguide Bragg reflector. To measure the response of the sensor, several PBS solns. with different concns. of potassium ion from 1 pM to 100 mM were dropped on the sensor surface. The shift of Bragg reflection wavelength was obsd. from the PBS soln. with lowest potassium concn., 1 pM. .