Three Langmuir‐Blodgett Monolayer Rectifiers Available to Purchase

The electrical rectification by a Langmuir‐Blodgett monolayer of γ‐hexadecylquinolinium tricyanoquinodimethanide, C₁₆H₃₃Q‐3CNQ, 1 has been verified between Al electrodes, then Au electrodes: this is due to the asymmetry of the molecule, and the interplay between the zwitterionic ground state D⁺‐π‐A⁻ and the less dissociated first electronic excited state D⁰‐π‐A⁰. Two new rectifers have been found. The first, 2,6‐di[dibutylamino‐phenylvinyl]‐1‐butylpyridinium iodide, (Bu₂NφV)₂BuPy⁺I⁻, 2 is an interionic rectifier which uses the reverse charge transfer between the iodide ion and the pyridinium ring. The second is dimethylanilinoaza[C₆₀]fullerene, DMAn‐NC₆₀, 3, for which incredibly high currents (up to 1 Ampere / 0.283 mm²) and high rectification ratios (up to 20,000) are seen, probably because of the formation of Au stalagmites within the monolayer