  The future of 2D flexible electronics relies on the preparation of conducting
ultrathin films of materials with mechanical robustness and flexibility in a
simple but controlled manner. In this respect, metal-organic compounds present
advantages over inorganic laminar crystals owing to their structural, chemical
and functional diversity. While most metal-organic compounds are usually
prepared in bulk, recent work has shown that some of them are processable down
to low dimensional forms. Here we report the one-pot preparation, carried out
at the water-air interface, of ultrathin (down to 4 nm) films of the
metal-organic compound [Cu2I2(TAA)]n (TAA= thioacetamide). The films are shown
to be homogenous over mm2 areas, smooth, highly transparent, mechanically
robust and good electrical conductors with memristive behavior at low
frequencies. This combination of properties, as well as the industrial
availability of the two building blocks required for the preparation,
demonstrates their wide range potential in future flexible and transparent
electronics.
