Monolayer films of surfactant ester derivatives of tris(2,2'-bipyridine)ruthenium(II)2+
| Autor: | G. L. Gaines, S. J. Valenty, P. E. Behnken |
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| Rok vydání: | 1978 |
| Předmět: | |
| Zdroj: | Journal of the American Chemical Society. 100:6549-6559 |
| ISSN: | 1520-5126 0002-7863 |
| DOI: | 10.1021/ja00489a001 |
| Popis: | Surfactant ruthenium complexes are attracting attention as potential photoinduced electron-transfer reagents, especially for possible light energy storage schemes. The ester derivatives ((bpy)/sub 2/Ru/sup II/(bpy(COOR/sub 1/)(COOR/sub 2/)))/sup 2 +/ (where bpy = 2,2'-bipyridine, the carboxy substituents are in the 4,4' positions, and R/sub 1/ = R/sub 2/ = C/sub 18/H/sub 37/(I); R/sub 1/ = C/sub 18/H/sub 37/, R/sub 2/ = H(III); and R/sub 1/ = C/sub 18/H/sub 37/, R/sub 2/ = C/sub 2/H/sub 5/(IV) have been prepared and characterized. The alkaline hydrolysis of I to octadecanol and II (R/sub 1/ = R/sub 2/ = H), with III as an intermediate product, proceeds more rapidly in monolayers and in 50% aqueous THF than does that of the water-soluble analogue V (R/sub 1/ = R/sub 2/ = C/sub 2/H/sub 5/) in aqueous solution. Both the surface pressure-area characteristics and luminescence of monolayers of the surfactant compounds spread on aqueous subphases depends strongly on dissolved anions; even traces of strongly interacting anions such as perchlorate lead to condensation of the films, while luminescence is approximately 20-fold more intense in the presence of perchlorate as compared with chloride. When the monolayers are transferred to glass slides, the pretreatment of the glass affects the extent ofmore » dark ester hydrolysis. Prolonged photolysis of monolayer assemblies on glass in contact with water leads to a slow (quantum yield, approximately 5 x 10/sup -6/) nonhydrolytic degradation of the complex, but to no detectable water dissociation (quantum yield for H/sub 2/ production, < or = 1 x 10/sup -4/). 8 figures; 2 tables.« less |
| Databáze: | OpenAIRE |
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