title: Mixed-Metal Coordination Cages Constructed with Pyridyl-Functionalized β-Diketonate Metalloligands: Syntheses, Structures and Host-Guest Properties.
abstract: 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 (H2 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.
authors: Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Collaborative Innovation Center of Chemistry for Energy Materials the Department of Chemistry, Fudan University, Shanghai 200433 (P. R. China).
authors: Ying-Ying
authors: YY
authors: Zhang
authors: Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Collaborative Innovation Center of Chemistry for Energy Materials the Department of Chemistry, Fudan University, Shanghai 200433 (P. R. China).
authors: Long
authors: L
authors: Zhang
authors: Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Collaborative Innovation Center of Chemistry for Energy Materials the Department of Chemistry, Fudan University, Shanghai 200433 (P. R. China).
authors: Yue-Jian
authors: YJ
authors: Lin
authors: Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Collaborative Innovation Center of Chemistry for Energy Materials the Department of Chemistry, Fudan University, Shanghai 200433 (P. R. China). gxjin@fudan.edu.cn.
authors: Guo-Xin
authors: GX
authors: Jin
keywords: beta-diketonate; half-sandwich complexes; heterometallic complexes; host-guest chemistry; metalloligands