A range of artificial molecular systems has been created that can exhibit controlled linear and rotational motion. In the further development of such systems, a key step is the addition of communication between molecules in a network. Here, we show that a two-dimensional array of dipolar molecular rotors can undergo simultaneous rotational switching when applying an electric field from the tip of a scanning tunnelling microscope. Several hundred rotors made from porphyrin-based double-decker complexes can be simultaneously rotated when in a hexagonal rotor network on a Cu(111) surface by applying biases above 1 V at 80 K. The phenomenon is observed only in a hexagonal rotor network due to the degeneracy of the ground-state dipole rotational energy barrier of the system. Defects are essential to increase electric torque on the rotor network and to stabilize the switched rotor domains. At low biases and low initial rotator angles, slight reorientations of individual rotors can occur, resulting in the rotator arms pointing in different directions. Analysis reveals that the rotator arm directions are not random, but are coordinated to minimize energy via crosstalk among the rotors through dipolar interactions.
A new dicopper(I) complex is reported that can be incorporated into extended architectures through multitopic carboxylate linkers; reversible carboxylate templation under pH control led to the formation of [2+2] and [3+3] metallomacrocycles.
To cite this version:Roman Stefak, Nicolas Ratel-Ramond, Gwénaël Rapenne. Synthesis and electrochemical characteristics of a donor-acceptor porphyrinate rotor mounted on a naphthalocyaninato europium complex. Inorganica Chimica Acta, Elsevier, 2012, 380, pp.181-186. 10
E-mail: rapenne@cemes.fr
Abstract.A heteroleptic porphyrinate phthalocyaninate donor-acceptor europium double-decker complex was synthesized. The UV-Vis spectral properties and cyclic voltammetry of the compound were investigated and compared to model compounds.
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