Abstract
New supramolecular structures were designed in this work using large-sized polyoxometalates (POMs) and crown-ether-based supramolecular cations selected as building blocks. Two novel supramolecular inorganic–organic hybrids [(3-F-4-MeAnis)([18]crown-6)]2[SMo12O40]•CH3CN (1) and [(4-IAnis)([18]crown-6)]3[PMo12O40]•4CH3CN (2) (3-F-4-MeAnis = 3-fluoro-4-methylanilinium and 4-IAnis = 4-iodoanilinium) were synthesized. Crystals 1 and 2 have been characterized by infrared spectroscopy (IR) and elemental analysis (EA). Based on X-ray diffraction analysis, Crystals 1 and 2 were constructed through noncovalent bonding interactions and belong to different space groups due to the difference of the building blocks used. Supramolecular cations formed due to strong N–H···O hydrogen bonding interactions between the six oxygen atoms of [18]crown-6 molecules and nitrogen atoms of anilinium derivatives. Crystal 1 has two different supramolecular cations with an anti-paralleled arrangement that forms a dimer through weak hydrogen bonding interactions between adjacent [18]crown-6 molecules. Crystal 2 has three independent supramolecular cations that fill large spaces between the [PMo12O40] polyoxoanions forming a rhombus-shape packing arrangement in the ac plane. Crystals 1 and 2 are unstable at room temperature.
Highlights
Crystal engineering, to create desired functional materials, involves the design of versatile crystal architectures based on molecular building blocks via a self-assembly process [1,2,3]
First,Crown crown ethers ethers are with a large supramolecular building blocks due to their structural advantages
Single crystal X-ray diffraction analysis revealed that the supramolecular Crystal 1 crystallizes in
Summary
To create desired functional materials, involves the design of versatile crystal architectures based on molecular building blocks via a self-assembly process [1,2,3]. Supramolecular crystal structures are constructed through noncovalent bonding interactions. The hydrogen bonding interaction is a significant force that can connect building blocks in different forms and affect the crystal structure [11]. The molecular packing can be adjusted by changing crystal building blocks to control the strength of intermolecular hydrogen bonding interactions [12,13]. POMs numerous exposed oxygen atoms which act as potential hydrogen bonding interaction sites contain [16,17,18]. First,Crown crown ethers ethers are with a large supramolecular building blocks due to their structural advantages. Ethers are composed of carbon, oxygen, nitrogen atoms atoms that are exposed and can act ascrown potential hydrogen bonding interaction sitesor [15].
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