title: Anion-templated self-assembly of highly stable Fe(II) pentagonal metallacycles with short anion-π contacts.
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 π-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-π contacts established between the anions and the tetrazine rings play an important role in the stability of the pentagons.
authors: Department of Chemistry, Texas A&M University, PO Box 30012, College Station, Texas 77842-3012, USA.
authors: Ian D
authors: ID
authors: Giles
authors: Helen T
authors: HT
authors: Chifotides
authors: Michael
authors: M
authors: Shatruk
authors: Kim R
authors: KR
authors: Dunbar