Chemistry Reference
In-Depth Information
Chapter 3
Coordination Polymers of Cucurbit[
n
]urils
with Metal Ions
Abstract
The recent work has revealed that Q[
n
]-based coordination chemistry is
gradually changing from simple coordination to novel polydimensional coordina-
tion polymers of metal ions to Q[
n
]s. In particular, our recent study revealed that
the coordination of Q[
n
]s with metal ions in the presence of a third species (often
an anionic species or an organic molecule), that is, a structure inducer, can result
in the formation of various cucurbit[
n
]uril-based polydimensional supramolecular
coordination architectures and polymers. Weak noncovalent interactions derived
from the “outer-surface interactions” of Q[
n
]s, such as hydrogen bonding,
ˀ
ˀ
stacking, and C-H
ˀ
and ion-dipole interactions, have important roles in those
systems. Detailed investigations have indicated that such noncovalent interactions
can be the main driving forces in the formation of Q[
n
]-based supramolecular
assemblies and functional materials. For example, the pore sizes and hydrophobic
cavities of these compounds that lead to unprecedented properties, and potential
applications in gas absorption, polycyclic aromatic hydrocarbons (PAHs) separa-
tion, and so on.
Keywords
Coordination polymers
·
Metal ions
·
Structure inducer
·
Hydrophobic
cavities
·
Gas absorption
·
PAHs separation
·
Polydimensional supramolecular
coordination
·
Supramolecular assemblies
3.1 Coordination Polymers Prepared by Simple Reaction
of Cucurbit[
n
]urils with Metal Ions
Generally, interaction of Q[
n
]s with metal ions give rise to simple complexes,
such as molecular bowl conformation, or molecular capsule conformation, and
so on, occasionally, give rise to some coordination polymers and supramolecular
assemblies. To the best of our knowledge, the only Q[5]-based linear coordina-
tion polymer was first reported by Liu and coworkers in 2006 by simply mixing
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