摘要:

AbstractAsymmetrical bis‐styryl cyanine dyes (IVa‐f) containing arylidene moieties were obtained through the interaction of 4,5,10‐trioxo‐1,2,3,4,5,10‐hexahydrobenz[g]quinoline (I) with aromatic aldehydes followed by condensation with 2‐methyl quaternary salts. In addition interaction of (I) with heterocyclic aldehydes, then condensation of the products (IIIa, b) with 2‐methyl quaternary salts gave the asymmetrical bis‐styryl cyanines (Va‐d). Other symmetrical bis‐styryl cyanines (VIIIa‐c) were also obtained as reaction products between 3,4,5,10‐tetra‐oxo‐1,2,3,4,5,10‐hexahydrobenz[g]quinoline (VII) and two moles of 2‐methyl quaternary salts. The new compounds were identified by i.r. spectra determination. Bactericidal activity of selected asymmetrical and symmetrical bis‐styryl cyanines (IVa‐i, Va‐dandVIIIa‐c) were test

ISSN:0264-3413    

DOI:10.1002/jctb.504330202

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

摘要:

AbstractCommercially available potassium copper ferrocyanide (KCuFC) has been studied for caesium sorption. An effective capacity of 2.25 ± 0.06 mmol g−1can be achieved at a caseium concentration of 0.015m. The presence of 0.82m, magnesium nitrate reduces the effective capacity to 2.04 ± 0.06 mmol g−1. The cyanoferrate also shows high caesium uptake in various simulated process solutions relevant to the treatment of radioactive wastes. KCuFC also possesses a high selectivity for caesium in high salt concentration solution. However, the cyanoferrate is not stable in acidic solution of pH<3. Desorption of the sorbed caesium at various nitric acid concentrations has been investigated and it is concluded that caesium is eluted by a chemical reaction step as a consequence of the oxidation of the cyanofe

ISSN:0264-3413    

DOI:10.1002/jctb.504330203

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

摘要:

AbstractThe kinetics of caesium sorption by potassium copper ferrocyanide have been studied. Liquid film diffusion is rate controlling in very dilute solutions of caesium (3.8 × 10−6m). The average film diffusion coefficient was found to be 1.465 × 10−9m2s−1at 20°C and the activation energy for the corresponding process was found to be 15.14 kJ mol−1. Chemical reaction rate controls the caesium‐potassium ion exchange process at a higher caesium concentration of 3.8 × 10−3m. The shell progressive reaction model was found applicable to the sorption process. The activation energy for the caesium‐potassium ion exchange reaction was measured to be 74.85 kJ mol−1. Finally, a comparison between the theoretical and the experimental sorption profile has been made to demonstrate the val

ISSN:0264-3413    

DOI:10.1002/jctb.504330204

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

摘要:

AbstractIn order to explore the possibility of using cross‐linked poly(4‐vinyl pyridine), PVP, for selective removal of cyanide in waste water by complexation of the cyanide with ferrous ion followed by ion exchange, the sorption behaviour of the anionic ferrocyanide complex (Fe(CN)64‐) on the resin operating in an acid salt form has been studied. The results are compared with those obtained on a conventional gel‐type weak base resin, Amberlite IRA‐68. The ferrocyanide complex is selectively sorbed in preference to other common ions and is readily stripped with dilute sodium hydroxide. PVP has a high sorption capacity, fast sorption kinetics and a rapid rate of regeneration, being much superior to Amberlite IRA‐68 in all these respects. The sorption rate is film‐diffusion controlled at low solution concentrations (0.8 mmol dm−3). Lowering pH to ∼ 1 increases the sorption of Fe(CN)64−on to protonated PVP by 75% over that at pH 7, a phenomenon explained by the formation of protonated ferrocyanide species, HFe(CN)63‐and H2Fe(CN)62‐. From column operations with 156 mg dm−3cyanide waste stream a capacity of 73 mg CN−g−1of protonated PVP to 1 mg dm−3breakthrough is determined, compared

ISSN:0264-3413    

DOI:10.1002/jctb.504330205

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

摘要:

AbstractVarious carboxylic acids containing the dichlorocyclopropane ring system were prepared from the direct reaction of unsaturated carboxylic acids with dichlorocarbene. For example, 2‐(2,2.dichloro‐1‐methylcyclopropyl)‐ethanoic acid (II) was prepared from 3‐methyl‐3‐butenoic acid (I), 50% aqueous sodium hydroxide solution and benzyltriethylammonium chloride (BTEAC) in 80% yield. Similarly, 3‐(2,2‐dichloro‐3,3‐dimethyIcyclopropyl)‐2,2‐diethyl propanoic acid (IV) was obtained in 80% yield from 2,2‐diethyl‐5‐methyl‐4‐hexenoic acid (III). The dichlorocyclopropane compounds, (II) and (IV), are potent insecticides against hou

ISSN:0264-3413    

DOI:10.1002/jctb.504330206

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

摘要:

AbstractThe zero order kinetics of the dissolution of CuO in ascorbic acid solution, acidified with HCl, was followed by measuring the absorbance of the coloured solution formed at 750 nm. From the variation of the logarithm of the rate constant with the reciprocal of the absolute temperature, an activation energy of 36 kJ mol‐1was calculated. The infrared spectrum of a solid isolated from the reaction mixture was compared with the spectrum of ascorbic acid. A tentative mechanism of the reaction is suggeste

ISSN:0264-3413    

DOI:10.1002/jctb.504330207

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

ISSN:0264-3413    

DOI:10.1002/jctb.504330208

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

ISSN:0264-3413    

DOI:10.1002/jctb.504330201

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY