Rhenium(I) bromo tricarbonyl complexes from anthracenyl derivatized ligands

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dc.contributor.authorMuñoz, José
dc.contributor.authorRojas, Xavier
dc.contributor.authorPalominos, Franco
dc.contributor.authorArce, Roxana
dc.contributor.authorCañas, Francisco
dc.contributor.authorPizarro, Nancy
dc.contributor.authorVega, Andrés
dc.date.accessioned2023-05-16T00:50:06Z
dc.date.available2023-05-16T00:50:06Z
dc.date.issued2023-07
dc.descriptionIDEXACIÓN:SCOPUSes
dc.description.abstractThe ligand 2-(1H-pyrazol-1-yl)pyrazine (pypyr) was prepared by reaction of 2-bromopyrazine with N-lithium pyrazolate with 92.5% yield, while the anthracenyl derivatives 2-(anthracen-9-yl)-5-(1H-pyrazol-1-yl)pyrazine (pypyr-anthra) and 9,10-bis(5-(1H-pyrazol-1-yl)pyrazin-2-yl)anthracene (pypyr-anthra-pypyr) were prepared by reaction of the 9-anthraceneboronic or bis-boronic acid pinacol ester with 2-bromo-5-(1H-pyrazol-1-yl)pyrazine with medium yields (49.6 and 31.5 % respectively). The respective ReI(CO)3Br complexes: [(pypyr)Re(CO)3Br], [(pypyr-anthra)Re(CO)3Br] and [Br(CO)3Re(pypyr-anthra-pypyr)Re(CO)3Br] were prepared in high yields (94, 84 and 78 % respectively) by reaction with bromotricarbonyl(tetrahydrofuran)rhenium(I) dimer. DFT modelling suggests the anthracenyl moiety is not coplanar with the pyrazolyl-pyrazine fragment, defining a dihedral angle of 65° and 67° for [(pypyr-anthra)Re(CO)3Br] and [Br(CO)3Re(pypyr-anthra-pypyr)Re(CO)3Br] respectively. Each one of the three rhenium(I) molecules shows a quasi-reversible reduction wave around − 1.10 V, assigned by comparison with the uncoordinated ligand, the pypyr fragment, while additional reductions waves related to this core or the anthryl arms are present. UV–Vis spectra show absorption bands and/or shoulders around 400–450 nm for the series of compounds in solution. The respective extinction coefficients (∼4 × 103 M−1cm−1), the sensitivity to solvent polarity and DFT modelling suggest they corresponds to MLCT Redπ → π(pyr)* transitions. Despite their high emissivity, the uncoordinated ligands completely lose their emission upon coordinated to ReI(CO)3Br. The rhenium(I) complexes emit around 650 nm upon excitation, although [(pypyr)Re(CO)3Br] is a moderate emissive molecule, while [(pypyr-anthra)Re(CO)3Br] and [Br(CO)3Re(pypyr-anthra-pypyr)Re(CO)3Br] are very weak ones. In contrast these two last molecules showed a remarkably high yield as singlet oxygen sensitizers. © 2023 Elsevier Ltdes
dc.identifier.citationPolyhedronVolume 23915 July 2023 Article number 116442es
dc.identifier.issn02775387
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/49677
dc.language.isoenes
dc.subjectAnthracenyl; Pyrazolyl; Rhenium(I); Tricarbonyles
dc.titleRhenium(I) bromo tricarbonyl complexes from anthracenyl derivatized ligandses
dc.typeArtículoes
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