摘要:

AbstractThe oxidative polymerization provides a new synthetic route to polyaromatics. Poly(p‐phenylene sulfide) (PPS) is produced by oxidative polymerization of thiophenol with a vanadyl complex catalyst. The metal complexes act as an efficient catalyst of oxygen oxidative polymerization. The polymerization to yield PPS is discussed especially focusing on the catalytic mechanism of the complexe

ISSN:0258-0322    

DOI:10.1002/masy.19920590103

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractPhotodynamic therapy and diagnosis (PDT) is described as an efficient clinical method for the treatment of cancer patients using hematoporphyrin derivative (Hpd) as sensitizer. Newly developed metal‐containing porphyrin type compounds are potential agents for PDT. A concept for covalently bound polymeric metal‐containing or metal‐free sensitizers is discussed. First results of these polymeric sensitizers are reported from in vivo experiments. High tumor accumulation up to 30% was observed. Results of fluorescence diagnosis are

ISSN:0258-0322    

DOI:10.1002/masy.19920590104

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractAdvances in understanding the photophysics and photochemistry of transition metal complexes offer opportunities to utilize these materials as luminescence sensors and probes. However, heterogeneity has an enormous effect on luminescence, quenching, and photochemistry. An intimate understanding of the detailed interactions between the complexes and their environment will be necessary before the rational design of new high performance sensors and probes can be achieved. Such understanding is fairly well established for homogeneous media, but it is still in its infancy in solid supports (surfaces and polymers). We present case studies involving luminescent metal complexes bound to a variety of polymer systems. Both their potential and the difficulties inherent in these composite systems are presented. We discuss tools that have proved useful or are likely to be valuable in unraveling these complex systems.

ISSN:0258-0322    

DOI:10.1002/masy.19920590105

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractHydroformylation of vinyl acetate was catalyzed by silica‐supported polyalumazane‐rhodium complex to give α‐acetoxypropanal in higher than 90% yield. The product was only α‐acetoxypropanal, isoaldehyde, and no β‐acetoxypropanal, normal aldehyde, or any other by‐product was observed. The catalyst was very stable in the hydroformylation, and it could be reused several times without any remarkable change of cata

ISSN:0258-0322    

DOI:10.1002/masy.19920590106

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractPolymer‐bound imidazole‐copper(II) complexes were investigated and applied as catalysts for oxidative coupling (polymerization) of 2,6‐dialkylphenols. These polymeric catalysts were also immobilized on silica particles through adsorption, quaternization and grafting. Especially, the grafted catalysts showed interesting catalytic properties, e.g. good specificity for C‐O coupling and very good stability during prolonged use in continuous processes. This stability furnished new information about the mechanism of the oxidative coupling polymerization. Finally, this reaction was optimized for the preparation of PPO‐type te

ISSN:0258-0322    

DOI:10.1002/masy.19920590107

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractThe activation of CO2and relevant comonomers can be promoted by using catalysts consisting of appropriate chelating polymers, suitable bimetallic combinations, and prepared by appropriate procedures. In this way, aliphatic polycarbonates, polycarbonate‐polyurethanes, saturated and unsaturated polycarbonate‐polyesters, as well as some other copolymers were synthesized in high yie

ISSN:0258-0322    

DOI:10.1002/masy.19920590108

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractOur recent results on the investigation of lanthanide metal polymer complexes were presented. Luminescence properties of Tb3+or Eu3+‐polycarboxylate complexes in aqueous solution were investigated. The excitation band near 300 nm for Tb or Eu(polyacrylate) solutions were drastically enhanced by the addition of hydroxy radical generating reagents as well as ultrasonic irradiation. These spectral changes were attributed to the energy transfer from chromophore molecules formed by generated hydroxy radicals in both systems. Since the increase in the luminescence intensity was proportional to the hydroxy radical concentration, the Eu3+or Tb3+(PAA) system can provide a convenient method for the determination of hydroxy radical concentration in aqueous solution. We have also utilized lanthanide metal ion complexes as a luminescent emitter in electroluminescence (EL) devices. The configuration of the EL cell and experimental results were discusse

ISSN:0258-0322    

DOI:10.1002/masy.19920590109

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractTertiary amino resins (TAR) were chemically modified by quaternization with methyl iodide. By this route six partly quaternized tertiary amino resins (PQTAR) with different I/N mole ratio were synthesized. Four different reducing agents, i.e., NaH, LiAlH4, CH3OH‐NaOH and NaBH4, were tested for the preparation of palladium catalysts dispersed on TAR or PQTAR. The rate of hydrogenation of methyl acrylate and the amount of Pd leached from the catalysts during the hydrogenation reaction were found to be dependent not only on the type of reducing agent but also on the structure of polymer support. Both the rate of hydrogenation and the amount of Pd eluted closely relate to the I/N mole ratio of the polymer support

ISSN:0258-0322    

DOI:10.1002/masy.19920590110

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractPalladium complexes of chitin and chitosan have been shown to have catalytic activities for hydrogenation at room temperature and under atmospheric pressure. They could catalyze not only reduction of olefines but also aromatic nitro‐compounds and acrylic acid. And they are very active, stable and selective. They also show different catalytic behaviors in different pH solutions. It is noteworthy that the catalytic activities of the two polymer‐supported metal complexes in the cycle of pH 11 → pH 2 → pH 11 are rev

ISSN:0258-0322    

DOI:10.1002/masy.19920590111

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractElectroconductive polyaromatics or polyarylenes have been successfully prepared by the oxidative polymerization of the corresponding simple monomers over the transition metal complex catalyst. For example, poly(1,4‐phenylene) was prepared from benzene by using oxygen as an oxidant and a copper(I) chloride‐aluminum chloride double complex as the catalyst. The same catalytic system was applied to the preparation of poly(2,5‐pyrrolylene) and poly(2,5‐thienylene) from pyrrole and 2,2′‐bithiophen, respectively. The electrochemical oxidative polymerization was also carried out for the preparation of the poly(1,4‐phenylene) and poly(1,4‐naphthylene) films in the presence of copper(I) chloride and al

ISSN:0258-0322    

DOI:10.1002/masy.19920590112

出版商:Hüthig&Wepf Verlag    

年代:1992

数据来源: WILEY