Premium
Mixed‐Metal Coordination Cages Constructed with Pyridyl‐Functionalized β‐Diketonate Metalloligands: Syntheses, Structures and Host–Guest Properties
Author(s) -
Zhang YingYing,
Zhang Long,
Lin YueJian,
Jin GuoXin
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201502194
Subject(s) - chemistry , molecule , crystallography , pyrene , bimetal , metal , copper , pyrazine , supramolecular chemistry , cage , oxalate , ligand (biochemistry) , stereochemistry , inorganic chemistry , crystal structure , organic chemistry , biochemistry , receptor , mathematics , combinatorics
The design and synthesis of mixed‐metal coordination cages, which can act as hosts to encapsule guest molecules, is a subject of intensive research, and the utilization of metalloligand is an effective method to construct a designed heterometallic architecture. Herein, a series of heterometallic cages with half‐sandwich Rh, Ir and Ru fragments using Cu II ‐metalloligand as a building block by a stepwise approach is reported. The cavity sizes of the cages could be controlled easily by the lengths of the organic ligands. Because the metalloligands in the oxalate‐based cage are somewhat distorted and concave, there are weak Cu⋅⋅⋅O interactions in the molecules, forming a binuclear copper unit. By increasing the height of the cages using longer ligands, 2,5‐dichloro‐3,6‐dihydroxy‐1,4‐benzoquinone (H 2 CA), the organometallic boxes display interesting host–guest behavior, which are made large enough to accommodate some large molecules, such as pyrene and [Pt(acac) 2 ]. Interestingly, the heterometallic cage with larger cavity size can transfer into a homometallic hexanuclear prism in the presence of pyrazine.