Anion-templated self-assembly of highly stable Fe(II) pentagonal metallacycles with short anion- contacts.
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abstract
The crystal structures of the self-assembled metallapentacycles [{Fe(5)(bptz)(5)(CH(3)CN)(10)} 2SbF(6)][SbF(6)](8) (1) and [{Fe(5)(bmtz)(5)(CH(3)CN)(10)} SbF(6)][SbF(6)](9) (2) with the -acidic ligands bptz (3,6-bis(2-pyridyl)-1,2,4,5-tetrazine) and bmtz (3,6-bis(2-pyrimidyl)-1,2,4,5-tetrazine), respectively, revealed cationic pentagons templated by [SbF(6)](-) ions. The short anion- contacts established between the anions and the tetrazine rings play an important role in the stability of the pentagons.