http://localhost:8080/xmlui/handle/123456789/1321 Fri, 10 Apr 2026 11:43:58 GMT 2026-04-10T11:43:58Z http://localhost:8080/xmlui/handle/123456789/3525 Title: Cyclic oligofurans: one-pot synthesis of 30 pi and 40 pi expanded porphyrinoids Authors: Reddy, J S; Mandal, S; Anand, V G Abstract: Acid-catalyzed condensation of furan and pentafluorobenzaldehyde yielded conjugated macrocycles with six and eight furan rings. They represent systems similar to annulenes with 30 d and 40 d electrons. From their structural analyses, it was found that furan rings in both the molecules were inverted in an alternative fashion and displayed nontwisted conformations. Sun, 01 Jan 2006 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/3525 2006-01-01T00:00:00Z http://localhost:8080/xmlui/handle/123456789/2677 Title: Cyclic Oligofurans: One-Pot Synthesis of 30π and 40π Expanded Porphyrinoids Authors: Reddy, J S; Mandal, S; Anand, V G Abstract: Acid-catalyzed condensation of furan and pentafluorobenzaldehyde yielded conjugated macrocycles with six and eight furan rings. They represent systems similar to annulenes with 30π and 40π electrons. From their structural analyses, it was found that furan rings in both the molecules were inverted in an alternative fashion and displayed nontwisted conformations. Thu, 23 Nov 2006 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/2677 2006-11-23T00:00:00Z http://localhost:8080/xmlui/handle/123456789/2675 Title: Ion Imprinted Polymer based Ion-selective Electrode for the Trace Determination of Dysprosium(III) Ions Authors: Prasad, K; Kala, R; Prasada Rao, T; Naidu, G R K Abstract: Ion-selective electrode (ISE) was designed by dispersing the dysprosium(III) IIP particles in 2-nitrophenyloctyl ether plasticizer and then embedded in polyvinyl chloride matrix. The ISE shows a Nernstian response for dysprosium(III) over a wide concentration range (8.0 × 10−6 to 1.0 × 10−1 M) with a slope of 21.7 mV per decade. The limit of detection was 2 × 10−6 M. This sensor has a very fast response time (∼10 s) and offers high selectivity compared to conventional chemical sensors towards dysprosium(III) with respect to several alkali, alkaline earth and transition metal ions as the selectivity is 10–100-fold better. The sensor was used for determination of dysprosium(III) ions by potentiometric (EDTA) titration and has been successfully demonstrated for the determination of fluoride in mouth wash solution. Thu, 27 Apr 2006 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/2675 2006-04-27T00:00:00Z http://localhost:8080/xmlui/handle/123456789/2662 Title: Elastic Properties of Ca5-xAxNb2TiO12 (A = Mg, Zn) Microwave Ceramics Authors: Vimala George; Philip, J; Bijumon, P V; Sebastian, M T Abstract: Microwave dielectrics in Ca5−xAxNb2TiO12 (A = Mg, Zn) system have been prepared for different values of x by conventional solid-state ceramic route. The elastic properties of the ceramics were investigated as a function of composition by ultrasonic techniques. X-ray diffraction studies revealed that the ceramics form phase pure compounds for 0 ≤ x ≤ 1 and form mixture phases beyond x = 1. The elastic properties were strongly affected by structural transformations. Magnesium-based compositions have better elastic properties compared with zinc-based system. Thu, 13 Apr 2006 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/2662 2006-04-13T00:00:00Z