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Controllable Coordination Self‐Assembly Based on Flexible Tripodal Ligands: From Finite Metallocages to Infinite Polycatenanes Step by Step
Author(s) -
Chen Qihui,
Chen Lian,
Jiang Feilong,
Hong Maochun
Publication year - 2015
Publication title -
the chemical record
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.61
H-Index - 78
eISSN - 1528-0691
pISSN - 1527-8999
DOI - 10.1002/tcr.201402095
Subject(s) - catenane , steric effects , metal , chemistry , stereochemistry , palladium , topology (electrical circuits) , crystallography , molecule , mathematics , organic chemistry , catalysis , combinatorics
Abstract This article describes the developments in coordination self‐assembly based on flexible tripodal ligands with different metal species. Various finite metallocages such as M 3 L 2 , M 6 L 8 , M 6 L 4 , M 4 L 4 and different catenanes based on discrete metallocages constructed from flexible tripodal ligands with suitable metal species are presented here. Many M 3 L 2 metallocages based on ligands L 1 –L 12 and different two‐coordinated metal species have been prepared, in which various Ag(I) salts and other metal species that have been protected by suitable groups, such as Zn(OAc) 2 , ZnBr 2 , and PdBr 2 , have been used as effective acceptors. All of the M 6 L 8 ‐type metallocages are constructed from ligands L 2 or L 12 –L 20 and different four‐coordinated metal species, such as various palladium(II) salts or NiCl 2 , and have similar topological structures. Only a few discrete M 6 L 4 ‐type metallocages, based on ligands L 21 –L 24 , have been reported, using different strategies such as protecting groups and steric hindrance. All of the M 4 L 4 ‐type cages have similar topological structures and are constructed from ligands L 25 –L 29 with multiple donor sites. More intriguing interlocking ensembles constructed from discrete metallocages are also described here in detail, namely, three [2]catenanes based on ligands L 30 –L 32 and four polycatenanes based on ligands L 33 –L 34 .