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Self-Assembling Zeolite Crystals into Uniformly Oriented Layers
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DOI：10.1021/la202112r.png)
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Abstract
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We report important progress made in the synthesis of oriented functional layers of nanochannel materials by using coordination chemistry as a tool. Zeolite L (ZL) crystals have been arranged into oriented layers through the coordinative interactions between a functional organic linker (L) and metal cations used for connecting the different parts. As organic linker we used a terpyridyl ligand bearing a urea group and a reactive siloxane part. Two strategies that lead to monolayers with different properties are described. The first consists of reacting the siloxane group of ligand L with OH groups of the substrate (S), and selectively reacting the siloxane group of L with OH groups located at the base of the ZL crystals. Next, metal cations Mn+, for example, Zn2+ or Cu2+, are coordinated to the terpy group on the modified substrate. To this the modified ZL is added and coordinatively bound by the terpy(Mnn+)terpy interaction, leading to oriented ZL layers. The second method consists of reacting substrate S and ligand L in the presence of a metal cation. A layer with reactive siloxane groups is formed on S to which the ZL crystals are bound by the reaction of the hydroxyl groups of their base. Zn2+, Cu2+, and lanthanide ions Eu3+ and Tb3+ have been tested successfully, all of them leading to high-quality ZL monolayers with open channels, accessible for accepting guests, oriented perpendicularly with respect to the surface of S.
Keywords:
MICROCRYSTALS
TERPYRIDINE
GLASS
ORGANIZATION
MONOLAYERS
COMPLEXES
AGENT
SIZE
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3.9
Papers:
5.4W
Citations:
10.6W
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