Redox-active cellulose Langmuir-Blodgett films containing beta-carotene as a molecular wire.
Redox-active Langmuir-Blodgett (LB) films containing dihydrophytyl ferrocenoate (DFc) and beta-carotene (betaC) were fabricated by use of 6-O-dihydrophytylcellulose (DHPC) as a matrix. A mixture of DFc-DHPC formed a stable monolayer. Atomic force microscopy images revealed that the DFc molecules were dispersed uniformly throughout the surface in the ratio DFc:DHPC = 2:8 at 30 mN m-1. The DFc-DHPC monolayer was transferred successfully onto a substrate, yielding Y-type LB films. Cyclic voltammograms for the DFc-DHPC LB films on an indium tin oxide (ITO) electrode exhibited a well-defined surface wave. The voltammograms of the DFc-DHPC LB films exhibited 60-40% redox-active ferrocene moieties, whereas those of the DFc-DHPC-betaC LB films exhibited 90-70%. X-ray diffraction patterns indicated that the distance between layers was independent of betaC molecules incorporated into the LB films. Consequently, these results suggested that betaC can function as a molecular wire.
Sakakibara
Keita
K
Division of Forest and Biomaterials Science, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan.
Kamitakahara
Hiroshi
H
Takano
Toshiyuki
T
Nakatsubo
Fumiaki
F
D002482:Cellulose / Q000031:analogs & derivatives* / Q000737:chemistry; D004563:Electrochemistry; D004566:Electrodes; D004579:Electron Transport; D005296:Ferrous Compounds / Q000737:chemistry; D018625:Microscopy, Atomic Force; D053770:Nanowires / Q000737:chemistry*; D010084:Oxidation-Reduction; D011108:Polymers / Q000737:chemistry*; D017971:Tin Compounds / Q000737:chemistry; D014961:X-Ray Diffraction; D019207:beta Carotene / Q000737:chemistry*
C512886:6-O-dihydrophytylcellulose; D005296:Ferrous Compounds; D011108:Polymers; D017971:Tin Compounds; C521886:dihydrophytyl ferrocenoate; D019207:beta Carotene; C109984:indium tin oxide; D002482:Cellulose