Expanded Ligands Based upon Iron(II) Coordination Compounds of Asymmetrical Bis(terpyridine) Domains

The synthesis and characterization of two tritopic ligands containing a 2,2':6',2″-terpyridine (tpy) metal binding domain and either a 3,2':6',3″- or a 4,2':6',4″-tpy domain are detailed. The synthetic routes to these ligands involved the [Pd(dppf)Cl ]-catalyzed couplin...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2022-12, Vol.28 (1), p.82
Main Authors: Rocco, Dalila, Prescimone, Alessandro, Housecroft, Catherine E, Constable, Edwin C
Format: Article
Language:English
Subjects:
2,2′:6′,2″-terpyridine
3,2′:6′,3″-terpyridine
4,2′:6′,4″-terpyridine
Crystals
Domains
expanded ligand
Ferrous Compounds
Hydrogen bonds
Iron
iron(II)
Ligands
Palladium
Pyrazine
Symmetry
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Summary:The synthesis and characterization of two tritopic ligands containing a 2,2':6',2″-terpyridine (tpy) metal binding domain and either a 3,2':6',3″- or a 4,2':6',4″-tpy domain are detailed. The synthetic routes to these ligands involved the [Pd(dppf)Cl ]-catalyzed coupling of a boronic ester-functionalized 2,2':6',2″-tpy with bromo-derivatives of 3,2':6',3″-tpy or 4,2':6',4″-tpy. The 2,2':6',2″-tpy domains of the tritopic ligands preferentially bind Fe in reactions with iron(II) salts leading to the formation of two homoleptic iron(II) complexes containing two peripheral 3,2':6',3″-tpy or 4,2':6',4″-tpy metal-binding sites, respectively. These iron(II) complexes are potentially tetratopic ligands and represent expanded versions of tetra(pyridin-4-yl)pyrazine.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules28010082