title: Cooperative Self-Assembly of a Quaternary Complex Formed by Two Cucurbit[7]uril Hosts, Cyclobis(paraquat-p-phenylene), and a "Designer" Guest.
abstract: The self-assembly in aqueous solution of the well-known cyclophane, cyclobis(paraquat-p-phenylene) (BB(4+) ), and two cucurbit[7]uril (CB7) hosts around a simple hydroquinol-based, diamine guest (GH2 (2+) ) was investigated by (1) H NMR and electronic absorption spectroscopies, electrospray mass spectrometry and DFT computations. The formation of a quaternary supramolecular assembly [GH2 (2+) ⋅BB(4+) ⋅ (CB7)2 ] was shown to be a very efficient process, which takes place not only because of the attractive forces between each of the hosts and the guest, but also because of the lateral interactions between the hosts in the final assembly. This complementary set of attractive interactions results in clear cooperative binding effects that help overcome the entropic barriers for multiple component assembly.
authors.affiliation: Department of Chemistry and Center for Supramolecular Science, University of Miami, Coral Gables, FL, 33124-0431, USA.
authors.forename: Mohammad Hossein
authors.initials: MH
authors.lastname: Tootoonchi
authors.affiliation: Department of Chemistry and Center for Supramolecular Science, University of Miami, Coral Gables, FL, 33124-0431, USA.
authors.forename: Gaurav
authors.initials: G
authors.lastname: Sharma
authors.affiliation: Department of Chemistry and Center for Supramolecular Science, University of Miami, Coral Gables, FL, 33124-0431, USA.
authors.forename: Jonathan
authors.initials: J
authors.lastname: Calles
authors.affiliation: Department of Chemistry and Center for Supramolecular Science, University of Miami, Coral Gables, FL, 33124-0431, USA.
authors.forename: Rajeev
authors.initials: R
authors.lastname: Prabhakar
authors.affiliation: Department of Chemistry and Center for Supramolecular Science, University of Miami, Coral Gables, FL, 33124-0431, USA. akaifer@miami.edu.
authors.forename: Angel E
authors.identifier: 0000-0001-7155-9889
authors.initials: AE
authors.lastname: Kaifer
keywords: cooperativity; cucurbiturils; molecular recognition; self-assembly