Langmuir-Blodgett films containing cluster molecules

The biomimetic stable planar molecular structures organized like biomembran e electron transport chains have been generated. They contain organometalli c chemically synthesized guest nanocluster molecules incorporated into iner t amphiphile molecular matrix of Langmuir-Blodgett films (a "proteins in me mbrane" model). Such structures can serve as the base for model investigati ons of the mechanicms of membrane redox reactions and are promising for the development of room-temperature controlled single-electron tunneling molec ular elements and systems via the creation of reproducible stable planar na nostructures with different systems of electron tunnel junctions. The doubl e tunnel junction structure "graphite substrate-platinum Pt-5(CO)(6)(PPh3)( 4) nanocluster molecule-STM tip" was studied, the effects related to single -electron tunneling and discrete electronic levels of spectrum were observe d in such structures at room temperature using STM. Platinum cluster molecu les appear to posses surface-active properties and on the water surface can form stable homogeneous monolayers, which can be effectively transferred o nto solid-state substrates so that corresponding multilayer LB films are ob tained. X-ray difractogranis recorded for those films show a number of Brag g peaks caused by layered structure of the films. Close values of intensity of the second harmonic generation measured for mono- and 11-layer LB films of platinum clusters give the evidence of the centrosymmetrical Y-type pac king of cluster molecules in multilayer films. Corresponding theoretical mo del of cluster molecules packing in such films has been proposed.