The authors look at 9-membered triphospha- and triarsamacrocycles with unsaturated benzo-backbones that they make using a [CpRFe]+ template.
The complexes from an interesting ‘cup-shaped’ cavity, which could potentially accommodate anions.
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Iron(II) template synthesis of benzannulated triphospha- and triarsamacrocycles
Thomas Albers, Julia Baker (neé Johnstone), Simon J. Coles, Peter G. Edwards, Benson Kariuki and Paul D. Newman
Dalton Trans., 2011, DOI: 10.1039/C0DT01724H