Catalysis colloid aspects

Interfacial electron-transfer reactions between polymer-bonded metal complexes and the substrates in solution phase were studied to show colloid aspects of polymer catalysis. A polymer-bonded metal complex often shows a specifically catalytic behavior, because the electron-transfer reactivity is strongly affected by the pol)rmer matrix that surrounds the complex. The electron-transfer reaction of the amphiphilic block copol)rmer-bonded Cu(II) complex with Fe(II)(phenanthroline)3 proceeded due to a favorable entropic contribution, which indicated hydrophobic environmental effect of the copolymer. An electrochemical study of the electron-transfer reaction between a poly(xylylviologen) coated electrode and Fe(III) ion gave the diffusion constants of mass-transfer and electron-exchange and the rate constant of electron-transfer in the macromolecular domain. 

Parmon VN. Abiogenic catalysis in Nature. Colloids and Surfaces A Physicochemical and Engineering Aspects 1999 151 351-65. 

The transitions of supported liquid-phase catalysts (SLPC) and supported aqueous-phase catalysts (SAPC) are dealt with in Section 3.1.1.3, while special aspects of clusters and colloids are discussed in Sections 3.1.1.4 and 3.1.1.5 and those of aqueous-phase, re-immobilized catalysts in Section 3.1.1.6. The combination of heterogeneous catalysis with aqueous (biphasic) techniques is also under investigation, e. g., [209]. 

The field of catalysis by use of metal clusters is undergoing an impressive renaissance. The interdisciplinary aspects of large clusters and colloids and of free and... 

The literature on colloidal metals is extensive and an adequate survey covering all aspects of their physical and chemical properties would require an interdisdpli-nary authorship of some size. This chapter reflects the predilections and limitations of the author and will concentrate on the chemical aspects of metal colloid science. Suffident physical discussion will be given to support the descriptions of the structures and spectroscopic properties of colloidal metals in the context of their chemical applications to catalysis. 

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