Extension and functionalization of an encapsulating macrobicyclic ligand using palladium-catalyzed Suzuki–Miyaura and Sonogashira reactions of iron(<scp>ii</scp>) dihalogenoclathrochelates with inherent halogen substituents

Denisenko, Irina N.; Varzatskii, Оleg А.; Selin, Roman A.; Belov, Alexander S.; Lebed, Ekaterina G.; Вологжанина, Анна В.; Zubavichus, Yan V.; Voloshin, Yan Z.

doi:10.1039/c8ra01819g

Cited by 6 publications

(2 citation statements)

References 23 publications

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“…The inert character of boron-capped clathrochelates offers the opportunity to perform postsynthetic modifications. For example, clathrochelates can be used in palladium-catalyzed cross-coupling reactions (Scheme , top). − For modifications in lateral position, substitution reactions are an interesting option. It is possible to prepare clathrochelate complexes containing between one and six chloro atoms in lateral position.…”

Section: Introductionmentioning

confidence: 99%

Clathrochelate Metalloligands in Supramolecular Chemistry and Materials Science

Jansze

Severin

2018

Acc. Chem. Res.

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The term "clathrochelate" describes a complex in which a coordinatively saturated metal ion is surrounded by a macropolycyclic ligand. First examples of clathrochelate complexes were reported 50 years ago. Meanwhile, the synthesis and reactivity of clathrochelates have been investigated in detail, and numerous applications have been explored. In this Account, we summarize work on the utilization of transition metal clathrochelates as metalloligands in supramolecular chemistry and materials science, with special focus on results from our group. First, we discuss the chemistry of boron-capped clathrochelates. These complexes are facile to synthesize by metal-templated condensation reactions. The synthesis is modular, and it is straightforward to implement structural variations. Importantly, it is possible to attach functional groups such as amines, pyridines, or carboxylic acids to the ligand periphery. Other noteworthy features of boron-capped clathrochelates are high thermodynamic and kinetic stability, tunable redox potential, and good solubility. Next, we show that clathrochelate-based metalloligands can be used to build molecularly defined metal-ligand assemblies of nanoscale dimensions. Different molecular architectures are described, including coordination cages with unusual gyrobifastigium or square orthobicupola-like structures. Metalloligands containing multiple clathrochelate complexes are particularly well suited to build large metal-ligand assemblies (>3 nm) with minimal synthetic efforts. Boron-capped clathrochelates have also been investigated in the context of materials chemistry. Linear or cross-linked clathrochelate polymers were found to display permanent porosity. Furthermore, such polymers were used to prepare conducting films on electrodes. Clathrochelate metalloligands are well suited to prepare metal-organic frameworks (MOFs). The high stability of clathrochelates ensures compatibility with harsh reaction conditions, and it mitigates potential problems such as exchange reactions. Boron-capped clathrochelates can be decorated with functional groups in lateral and apical position, and it is possible to use these complexes as multiconnected nodes in polymeric structures. Overall, we hope to convey the utility of clathrochelate complexes in supramolecular chemistry and materials science. The work published thus far gives a first glimpse of the potential of these compounds, but there are other directions, which are waiting to be explored. For example, it will be interesting to study the properties of nanostructures based on chiral clathrochelate complexes. Furthermore, the redox and magnetic properties of clathrochelates may give rise to novel functional materials. Given that clathrochelates are straightforward to prepare, we hope that others will join the efforts to explore the supramolecular and materials chemistry of these interesting molecular building blocks.

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Section: Introductionmentioning

confidence: 99%

Clathrochelate Metalloligands in Supramolecular Chemistry and Materials Science

Jansze

Severin

2018

Acc. Chem. Res.

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“…[26][27][28] Iron(II) clathrochelate is a robust metalorganic unit with a considerable internal free volume (IFV) and which can be easily synthesized and functionalized, especially when employed as a building block in cross-coupling reactions. [29][30][31] Iron(II) clathrochelate complexes were tested as biosensors, 32,33 catalysts for hydrogen generation, 34,35 materials for electronic transport, 36 organogels, 37 and to make supramolecular structures of denite shapes and sizes. [38][39][40][41] Recently, several iron(II) clathrochelate based polymers were reported disclosing prominent porous properties.…”

Section: Introductionmentioning

confidence: 99%