Abstract
We employed (Z)-N'-[phenyl(pyrimidin-2-yl)methylene]nicotinohydrazide (2) and (Z)-4-(dimethylamino)-N'-[phenyl(pyrimidin-2-yl)methylene]benzohydrazide (3) as cores of dynamic chemical systems whose different states are modulated, in a reversible fashion, through specific physical and chemical stimuli. The structure of the compounds was determined by Nuclear Magnetic Resonance (NMR) techniques (1D and 2D) and confirmed by single-crystal X-ray diffraction. By Variable temperature (VT)H-1 NMR experiments and DFT calculations, the conformational isomerism of2was studied and added as an additional input for the dynamic system. Additionally,2exhibits configurationalE/Zisomerization mediated by pH variations and UV light. On the other hand, configurational isomerism locks an unlocks a tridentate pocket for metal cation coordination in both2and3. All the different dynamic states configurational/conformational isomerism and locked and unlocked coordination constitute a development in the field of systems of multiple dynamics suitable for molecular machines.
