摘要:

AbstractMacromolecular cross‐linked ligands containing pyridyl pendant groups are characterized by a combination of inverse steric exclusion chromatography, ESR and NMR spectrometries in water and methanol. On the basis of the relevant results, methanol is seen to be clearly the best swelling agent and it is chosen as medium for CuIIcoordinatio

ISSN:1022-1360    

DOI:10.1002/masy.19981310103

出版商:Hüthig&Wepf Verlag    

年代:1998

数据来源: WILEY

摘要:

AbstractSeveral N‐acryloyl and N‐methacryloyl substituted amino acids have been prepared and copolymerized with acrylic acid and itaconic acid to prepare new polyelectrolytes. Due to an acid‐base reaction, mixing of the water soluble copolymers with glass powders, having leachable Ca2+, Al3+, etc., type cations, produces inorganic‐organic composites hardened by salt ‐bridge formation. These heretofore unexplored polyelectrolytes are shown to be very useful for preparing improved dental bio

ISSN:1022-1360    

DOI:10.1002/masy.19981310104

出版商:Hüthig&Wepf Verlag    

年代:1998

数据来源: WILEY

摘要:

AbstractThe radical polymerization and copolymerization of salts of unsaturated carboxylic acids were used for the production of metal‐containing polymers. The kinetic peculiarities and copolymerization parameters were estimated. The synthesis and structure of transition metal acrylates, maleates, fumarates, and itaconates are discussed. The influence of the metal atom on salt reactivities and reaction rates is observe

ISSN:1022-1360    

DOI:10.1002/masy.19981310105

出版商:Hüthig&Wepf Verlag    

年代:1998

数据来源: WILEY

摘要:

AbstractA number of complexing polymers containing carboxylic, phosphorylic, amine, imine and pyridine functional groups have been prepared and their complexes with copper, cobalt and nickel have been obtained. The complexes were prearranged for reactions of liquid phase oxidation and hydrogenation of hydrocarbons by means of formation and subsequent fixation in memory of the catalysts the structure of active centres favorable for catalyzed substrate. It has been shown that the prearranged complexes might ≤remember≥ the structure optimum for the substrate and this leads to an essential increase in catalytic activity and selectivity of the cataly

ISSN:1022-1360    

DOI:10.1002/masy.19981310106

出版商:Hüthig&Wepf Verlag    

年代:1998

数据来源: WILEY

摘要:

AbstractThis paper presents a discussion of four areas in which the interaction between organic polymers and metal species is of importance. The first section discusses the effect of metal ions in random ionomers in bulk, where the presence of ions strongly influence the mechanical properties. The next topic covers the influence of metal ions on aqueous solutions of block copolymers, and describes the morphogenic effects seen in such systems. The third section deals with the use of metal ions in non‐aqueous solutions of block copolymers leading to the formation of microreactors with a high degree of size control. Finally, the attachment of organometallic species to the corona of block copolymer micelles in non‐aqueous solution is discussed in terms of the effect of the metal on the micelle dimensi

ISSN:1022-1360    

DOI:10.1002/masy.19981310107

出版商:Hüthig&Wepf Verlag    

年代:1998

数据来源: WILEY

摘要:

AbstractMacrocyclic bis‐dienes and diendienophile were prepared in Diels‐Alder reactions starting from the bis‐dienophilic (hemiporphyrazinato)nickel complex1. Compound1was reacted either with the tetraene2or with tetra‐phenylcyclopentadienone (4). By combination of macrocyclic bis‐dienes and bis‐dienophiles, ladder‐type oligomers (e.g.9or10) were synthesized. The described oligomers are precursors for the corresponding conjugated oligomers, which are of interest as organic conductors. The preparation of the corresponding phthalocyanine compounds e.g.13–16and a method for obtaining the wanted “D2h” phthalocyanine19without using tedious m

ISSN:1022-1360    

DOI:10.1002/masy.19981310108

出版商:Hüthig&Wepf Verlag    

年代:1998

数据来源: WILEY

摘要:

AbstractCoordination of π‐conjugated polymers to transition metals constructs a novel redox system due to interchangeable various oxidation states of the polymers, which permits transition metals to interact with each other through a π‐conjugate chain. The redox characteristics were found to depend on the electronic interaction with metals and the doping. A combination of copper(II) or iron(III) chloride and polyanilines afforded the complex catalysts with the higher oxidation capability for dehydrogenative oxidation. A catalytic system was also realized in the transition‐metal‐induced oxidation reaction, in which π‐conjugated polymers serve as redox‐active ligands participating in the reversible redox cycle. The Wacker oxidation of terminal olefins proceeded catalytically in the presence of a catalytic amount of polyaniline or polypyrrole derivativ

ISSN:1022-1360    

DOI:10.1002/masy.19981310109

出版商:Hüthig&Wepf Verlag    

年代:1998

数据来源: WILEY

摘要:

AbstractSeveral kinds of polymers having tetraphenylporphyrin (TPP) or some metallotetraphenylporphyrin (AgTPP, CuTPP, VOTPP or ZnTPP) moieties as their side chains have been prepared by the radical polymerization of the corresponding vinyl monomers. Visible spectra of these polymers show the clear hypochromism in the Soret bands of the tetraphenylporphyrin moieties as compared with those of the corresponding monomers. Polymer effects were clearly observed in the magnetic behaviors and the oxygen adsorption of paramagnetic metalloporphyrin moieties. In addition, polymer effects on photophysical and photochemical behaviors of ZnTPP were found in the amphiphilic polymers covalently tethered with small amounts of ZnTPP and hydrophobic substituents above a critical content, which form hydrophobic domains due to aggregation of the hydrophobic groups in aqueous solution.

ISSN:1022-1360    

DOI:10.1002/masy.19981310110

出版商:Hüthig&Wepf Verlag    

年代:1998

数据来源: WILEY

摘要:

AbstractIt was found that photoelectrochemical water oxidation takes place at a polynuclear iron‐cyanide complex‐coated electrode called Berlin Brown (BB; Fe4III[FeIII(CN)6]333X). The electrode‐coated BB showed electrocatalytic activity for water oxidation to produce O2not only in the dark but also under illumination to result in photoinduced water oxidation. The amount of the photoelectrochemically produced O2increased with the thickness of the BB film, indicating that the BB works as a bulk cat

ISSN:1022-1360    

DOI:10.1002/masy.19981310111

出版商:Hüthig&Wepf Verlag    

年代:1998

数据来源: WILEY

摘要:

AbstractNew water‐soluble macromolecular palladium complexes with phase transfer ability were used for two‐phase Wacker oxidation of higher alkenes. Macromolecular metal complexes have been prepared employing as ligands monobutyl ether of polyethylene oxide and copolymers of ethylene oxide and propylene oxide functionalized by β,β'‐iminodipropionitrile and acetodinitrile. Macromolecular metal complexes exhibited high activity and selectivity as catalysts for Wacker oxidation of different alkenes: octene‐1, dodecene‐1, hexadecene‐1, styrene, propenylbenzene, cyclooctadiene‐1,5. The complexes based on β,β'‐iminodipropionitrile ligands showed the highest activity. All catalysts can be easily separated from product and used repeatedly without d

ISSN:1022-1360    

DOI:10.1002/masy.19981310112

出版商:Hüthig&Wepf Verlag    

年代:1998

数据来源: WILEY