摘要:

AbstractNew spectral data for cobalt (II)‐ligand‐solvent systems is reported and spectroscopic parameters are evaluated for various tetrahedral and octahedral species sorted on ion exchang

ISSN:0021-2148    

DOI:10.1002/ijch.197200089

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractA comparison is drawn between the fundamental logic of the origin of ion exchange affinity, and that of the newly discovered behavior of interactive gels. The basis for predicting interactive chromatographic affinity is examined.

ISSN:0021-2148    

DOI:10.1002/ijch.197200090

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractNew anion exchange resins were prepared by the interaction of sulfonated and chloromethylated crosslinked polystyrene with hexamine, ethylene diamine, and thiourea. The conditions of preparation were based on existing information concerning the analogous monomers and were adapted to the special case of the polymeric matrix.

ISSN:0021-2148    

DOI:10.1002/ijch.197200091

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractThe integral heat evolved on swelling of the anion exchange resin Dowex‐1 in chloride and perchlorate forms in water, methanol, ethanol, n‐propanol, acetone and formamide, and in aqueous mixtures of these solvents, was measured calorimetrically as a function of the cross‐linking of the resin (4,8 and 16% DVB) and the solvent composition. Heats of swelling (wetting) of the resin skeleton were also measured. These were found to be negligible compared with the heats of swelling of the exchangers which were in the range of 4–8 kcal/equiv. resin for the chloride form with water, methanol, ethanol and formamide, or their aqueous mixtures, but considerably smaller for the chloride form and solvents rich in propanol or acetone as well as for the perchlorate form. The heats of solution of the monomer analog, benzyltrimethylammonium chloride were found to be endothermic. Their relevance to the heat of swelling, and that of the heat of mixing of the solvents, was e

ISSN:0021-2148    

DOI:10.1002/ijch.197200092

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractThe kinetics of uptake at 25° of 0.01 N HCl by dimethylamine‐aminated macroporous resins depend in a complex manner on the porosity of the resin. While pure C‐ and P‐kinetics are observed respectively at the nonporous and highly macroporous ends of the porosity scale, under the experimental conditions employed the diffusional and chemical fluxes are similar in magnitude, and either pseudo‐P or pseudo‐C kinetics may be shown at intermediate porosity levels, of which three examples have bee

ISSN:0021-2148    

DOI:10.1002/ijch.197200093

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractThe formation of the mixed iodo‐cyano cadmate (II) complexes at coordination level four in aqueous solutions was examined by Raman spectrophotometry. The existence of the species CdI3CN2−was definitely proven, while the existence of the other species CdI2(CN)22−and CdI(CN)32−could not be esta

ISSN:0021-2148    

DOI:10.1002/ijch.197200094

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractThe transformation of the blue color of bentonite‐benzidine pastes to green or yellow‐green upon air drying was studied by means of reflectance measurements and by comparison of the samples under study with color charts. The relative amounts of benzidine and bentonite and the relative humidity had a decisive effect on the color of the air dried films. Hygroscopic compounds such as LiCl and CaCl2produced results similar to that produced by increasing the relative humidity. The explanation of the color reactions is based on the assumption that the (blue) monovalent and the (yellow) divalent cations coexist in the air dry benzidine‐bentonite

ISSN:0021-2148    

DOI:10.1002/ijch.197200095

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractCrystalline complexes of bromine with aromatic macrocyclic polyethers were isolated and the equilibrium constants of complexation of bromine with the aliphatic macrocyclic polyether dicyclohexyl‐18‐ crown −6 and with THF in CCl4‐ethyl bromide solutions were determined by PMR spect

ISSN:0021-2148    

DOI:10.1002/ijch.197200096

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractNormal fatty acids (C9‐C19); isoprenoid acid (C10); aromatic acids (C11‐C13) of the general formula CnH2 n‐8O2, and two aromatic acids (C11, C12) of the formula CnH2 n‐14O2, were identified in a bitumen obtained from shale of Nebi Musa (near Jericho), using chromatographic (GLC) and spectroscopic (MS)

ISSN:0021-2148    

DOI:10.1002/ijch.197200097

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY

摘要:

AbstractThermally stable polyamides were prepared by reaction of aromatic diamines with pyrrolidone dicarboxylic acids obtained by reaction of itaconic acid with aromatic diamines. The reaction was carried out either by melt poly‐condensation or by converting the diacids to their active mixed anhydrides and reacting them with the diamines. Polybenzimidazoles were prepared by melt polymerization of the pyrrolidone dicarboxylic acids with 3,3′‐diamino‐benzidine. All the polymers were soluble in concentrated sulfuric acid and part of them were also partially soluble in DMF or DMSO. DTA and TGA measurements in air showed that the polyamides were stable up to about 400° and the polybenzimidazoles were stable

ISSN:0021-2148    

DOI:10.1002/ijch.197200098

出版商:WILEY‐VCH Verlag    

年代:1972

数据来源: WILEY