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Ditopic Hexadentate Ligands with a Central Dihydrobenzo-diimidazole Unit Forming a [2x2] Zn$_{4}$ Grid Complex

Schäfer, Bernhard 1; Suryadevara, Nithin 1; Greisch, Jean-Francois 1; Fuhr, Olaf 2; Kappes, Manfred M. 3; Ruben, Mario 4
1 Karlsruher Institut für Technologie (KIT)
2 Karlsruhe Nano Micro Facility (KNMF), Karlsruher Institut für Technologie (KIT)
3 Institut für Physikalische Chemie (IPC), Karlsruher Institut für Technologie (KIT)
4 Institut für Quantenmaterialien und -technologien (IQMT), Karlsruher Institut für Technologie (KIT)

Ditopic ligands are appropriate candidates for homo‐ and hetero‐metallic supramolecular complexes. Two ditopic hexadentate ligands, which are highly interconvertible, are separated from a single ligand L by blocking tautomerism. They form remarkable divergent tetra‐nuclear grid complexes with Zinc(II) showing luminescence properties.
A family of ditopic hexadentate ligands based on the parent compound 2,6‐bis(6‐(pyrazol‐1‐yl)pyridin‐2‐yl)‐1,5‐dihydrobenzo[1,2‐d:4,5‐d’]diimidazole (L) was developed and synthesized by using a straightforward condensation reaction, which forms the interlinking central benzo[1,2‐d:4,5‐d’]diimidazole bridge in the ligand backbone. The two secondary amine groups of the benzodiimidazole unit tautomerize and allow the formation of two tauto‐conformers, which upon treatment with metal salts forms different isomeric coordination complexes. Here we report six new derivatives (1–6) that can tautomerize (varying the pyrazolylpyridine part) and 14 derivatives (7–13) with different alkyl and benzyl substitution on secondary amino groups (of L) that prevent the tautomerization. This way, it is possible to study the properties of isomeric coordination complexes and their intrinsic cooperativity by the example of [2x2] grid complexes in the future. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000132617
Veröffentlicht am 12.05.2021
DOI: 10.1002/ejoc.202100230
Zitationen: 2
Web of Science
Zitationen: 2
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Institut für Physikalische Chemie (IPC)
Institut für Quantenmaterialien und -technologien (IQMT)
Karlsruhe Nano Micro Facility (KNMF)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 03.2021
Sprache Englisch
Identifikator ISSN: 1434-193X, 0075-4617, 0170-2041, 0365-5490, 0947-3440, 1099-0690, 1434-243X
KITopen-ID: 1000132617
HGF-Programm 47.12.02 (POF IV, LK 01) Exploratory Qubits
Erschienen in European Journal of Organic Chemistry
Verlag John Wiley and Sons
Band 2021
Heft 16
Seiten 2301-2310
Vorab online veröffentlicht am 26.03.2021
Schlagwörter Divergent; Grid complex; Polypyridine; Tautomerism; Zinc
Nachgewiesen in Web of Science
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