Structural and functional characterization of an organometallic ruthenium complex as a potential myorelaxant drug.

•The organoruthenium-nitrophen complex C1-Cl blocks skeletal muscle twitch.•The C1-Cl-induced twitch block is rapidly reversed by the ChE inhibitor neostigmine.•C1-Cl decreases the amplitude of muscle end-plate potentials.•C1-Cl has no effect on the resting membrane potential of muscle fibers.•C1-Cl may be considered as a potential myorelaxant drug.