Abstract
Molecules of Co–salen, a paramagnetic metal–organic Schiff base complex, self-assembleinto two different well ordered morphologies on a NaCl(001) substrate: nanowires,which form networks, and compact nanocrystallites. Their growth can becontrolled by adjusting the deposition parameters. It turns out that the nanowiresare metastable. Molecular resolution images suggest that the packing in bothmorphologies is the same as in bulk Co–salen single crystals. Only the orientation of thec-axis with respect to the substrate is different. The origin of this intriguing bimodal growthis associated with a monomer-to-dimer transition, which probably takes place during initialnucleation at step edges.
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