ISSN:0005-9021    

DOI:10.1002/bbpc.19780820902

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1978

数据来源: WILEY

摘要:

AbstractVarious techniques have been used for organizing molecules at interfaces to form monolayers. With these components of designed monolayer assemblies complex systems of cooperating molecules have been constructed and it is shown that the planned functions of the artificial units depend strongly on the spatial and energetic coordination of the constituent molecules.

ISSN:0005-9021    

DOI:10.1002/bbpc.19780820903

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1978

数据来源: WILEY

摘要:

AbstractThis paper summarizes a number of investigations of reactions occurring in organized monolayer assemblies, monolayer films, and at monolayer assembly or film‐solution interfaces. In several cases, the reactions involve chromophores localized in relatively hydrophobic sites and pronounced differences in reactivity can be ascribed to the microenvironment. Metallation of free base porphyrins has been examined in assemblies and at film‐solution interfaces. Although several divalent metal ions can be incorporated, the order of reactivity varies from that observed in solution. Several porphyrins residing in highly hydrophobic sites are resistant to metallation while those lying near the hydrophilic interface react rapidly. Photooxidation of surfactant protoporphyrin esters residing in hydrophobic regions occurs in both micelles and monolayers but the product distribution is quite different from that obtained in solution. Iron and ruthenium porphyrins isolated in assemblies undergo ligand substitution reactions not readily observable in solution. The photoreactions of some surfactant styrenes has been examined; close packing of the styrene unit, which lies at the end of a hydrocarbon chain, leads to substantial ground state interaction and rapid and selective dimerization on irradiation. Different products are obtained from those formed on irradiation of the same compound in solution, micelles, and crystals. The photoreactivity of a surfactant phenyl ketone has been investigated in condensed monolayers. In solution the primary reaction of the ketone is the “type II” photoelimination which proceeds via α‐hydrogen abstraction. In condensed monolayers the required conformation for this reaction can evidently not be readily attained. Thus in the assemblies dramatic reduction in the efficiency of the type II process occurs concurrent with the onset of new reac

ISSN:0005-9021    

DOI:10.1002/bbpc.19780820904

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1978

数据来源: WILEY

ISSN:0005-9021    

DOI:10.1002/bbpc.19780820906

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1978

数据来源: WILEY

摘要:

AbstractElectron injection from photoexcited cyanine dyes into the conduction band of a thin film semiconductor (indiumoxide) is investigated in an electrochemical cell. The sensitizing dyes are incorporated into tenside monolayers covering the electrode. Separation of the chromophores from the electrode by two tenside layers suppresses sensitized photocurrent. Insertion of an appropriate second dye at the semiconductor surface recovers the sensitizing yield of the distant dye. The distant dye absorbs light, transfers energy to the second dye at the semiconductor surface which transfers an electron into the electrode. The processes in this concerted energy‐electron‐transfer system are characterized by simultaneous measurement of photocurrent and fluorescence emiss

ISSN:0005-9021    

DOI:10.1002/bbpc.19780820908

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1978

数据来源: WILEY

ISSN:0005-9021    

DOI:10.1002/bbpc.19780820910

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1978

数据来源: WILEY

摘要:

AbstractThe apparentpK of a lipoidpH‐Indicator was measured in lipid monolayers, “black” lipid membranes and lipid microvesicles. The results are discussed with respect to the Gouy‐Chapman theory, the chemical structure and packing density of the different lipids used in the study, and the possible application of lipoidpH‐indicators in biologica

ISSN:0005-9021    

DOI:10.1002/bbpc.19780820911

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1978

数据来源: WILEY

ISSN:0005-9021    

DOI:10.1002/bbpc.19780820912

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1978

数据来源: WILEY

摘要:

AbstractThe adsorption of fluorobenzene, chlorobenzene, and benzonitrile on the surface of water has been determined by measurements of the surface tension as a function of the vapor pressure of the organic vapor. The standard thermodynamic quantities of adsorption, δGo, δHo, and δSo, were calculated at the zero‐coverage limit. δHois less negative than the enthalpy of condensation of the respective pure vapor. Near the saturation vapor pressure chlorobenzene forms a single monolayer whereas fluorobenzene tends to multilayer formation. The stability of adsorbed films on water is predicted by the Lifshitz formula in the correct sequence fluorobenzene>benzene>chlorobe

ISSN:0005-9021    

DOI:10.1002/bbpc.19780820914

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1978

数据来源: WILEY

ISSN:0005-9021    

DOI:10.1002/bbpc.19780820915

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1978

数据来源: WILEY