title: Selective synthesis of iridium(iii)-derived molecular Borromean rings, [2]catenane and ring-in-ring macrocycles via coordination-driven self-assembly.
abstract: This paper reports the formation of unprecedented iridium(iii)-derived topological macrocycles. Discrete molecular Borromean rings 1 and 3 in pure form are synthesized via coordination-driven self-assembly of an acceptor [(Cp*Ir)2(OO∩OO)](OTf)2(Cp* = pentamethylcyclopentadienyl, OO∩OO = 6,11-dioxido-5,12-naphthacenedione) (A) with dipyridyl donors 1,4-bis(4-pyridinylethynyl)benzene (L1) and 2,5-bis(4-pyridinylethynyl)thiophene (L2) respectively in methanol. Self-assembly using the same acceptor under similar conditions with two other donors 9,10-bis(4-pyridinylethynyl)anthracene (L3) and 1,4-di(4-pyridinylethynyl)buta-1,3-diyne (L4) resulted in [2]catenane 5 and non-catenane ring-in-ring topological macrocycle 7 respectively. Rectangular macrocycles 2, 4, 6, and 8 were respectively obtained when the self-assembly of acceptor A with one of the donors L1-L4was carried out under dilute conditions in nitromethane or methanol. All these new macrocycles were characterized by1H and13C NMR, 2D NMR, ESI-MS and elemental analyses. Single crystal X-ray structures of Borromean rings 1 and 3, and ring-in-ring macrocycle 7 revealed that the length and functionality of donors enabling CHπ and ππ interactions govern the topology.
authors.affiliation: Department of Chemistry, University of Ulsan, Ulsan 44610, Republic of Korea. kwchi@ulsan.ac.kr.
authors.forename: Nem
authors.initials: N
authors.lastname: Singh
authors.affiliation: Department of Chemistry, Ulsan National Institute of Science & Technology, Ulsan 44919, Republic of Korea.
authors.forename: Dongwook
authors.initials: D
authors.lastname: Kim
authors.affiliation: Department of Chemistry, University of Ulsan, Ulsan 44610, Republic of Korea. kwchi@ulsan.ac.kr.
authors.forename: Dong Hwan
authors.initials: DH
authors.lastname: Kim
authors.affiliation: Protein Structure Group, Korea Basic Science Institute, Ochang, Chungbuk 28119, Republic of Korea.
authors.forename: Eun-Hee
authors.initials: EH
authors.lastname: Kim
authors.affiliation: Energy Materials Laboratory, Korea Institute of Energy Research, Daejeon 28119, Republic of Korea.
authors.forename: Hyunuk
authors.initials: H
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Ulsan National Institute of Science & Technology, Ulsan 44919, Republic of Korea.
authors.forename: Myoung Soo
authors.initials: MS
authors.lastname: Lah
authors.affiliation: Department of Chemistry, University of Ulsan, Ulsan 44610, Republic of Korea. kwchi@ulsan.ac.kr.
authors.forename: Ki-Whan
authors.identifier: http://orcid.org/0000-0003-2952-3385
authors.initials: KW
authors.lastname: Chi