{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"omics_type":["Unknown"],"volume":["62(48)"],"submitter":["Knighton RC"],"pubmed_abstract":["A series of photoluminescent Ru(II) polypyridine complexes have been synthesized in a manner that varies the extent of the cationic charge. Two ligand systems (L1 and L2), based upon 2,2'-bipyridine (bipy) mono- or difunctionalized at the 5- or 5,5'-positions using <i>N</i>-methylimidazolium groups, were utilized. The resulting Ru(II) species therefore carried +3, +4, +6, and +8 complex moieties based on a [Ru(bipy)<sub>3</sub>]<sup>2+</sup> core. Tetra-cationic [Ru(bipy)<sub>2</sub>(<b>L2</b>)][PF<sub>6</sub>]<sub>4</sub> was characterized using XRD, revealing H-bonding interactions between two of the counteranions and the cationic unit. The ground-state features of the complexes were found to closely resemble those of the parent unfunctionalized [Ru(bipy)<sub>3</sub>]<sup>2+</sup> complex. In contrast, the excited state properties produce a variation in emission maxima, including a bathochromic 44 nm shift of the <sup>3</sup>MLCT band for the tetra-cationic complex; interestingly, further increases in overall charge to +6 and +8 produced a hypsochromic shift in the <sup>3</sup>MLCT band. Supporting DFT calculations suggest that the trend in emission behavior may, in part, be due to the precise nature of the LUMO and its localization. The utility of a photoactive polycationic Ru(II) complex was then demonstrated through the sensitization of a polyanionic Yb(III) complex in free solution. The study shows that electrostatically driven ion pairing is sufficient to facilitate energy transfer between the <sup>3</sup>MLCT donor state of the Ru(II) complex and the accepting <sup>2</sup>F<sub>5/2</sub> excited state of Yb(III)."],"journal":["Inorganic chemistry"],"pagination":["19446-19456"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC10698718"],"repository":["biostudies-literature"],"pubmed_title":["Polycationic Ru(II) Luminophores: Syntheses, Photophysics, and Application in Electrostatically Driven Sensitization of Lanthanide Luminescence."],"pmcid":["PMC10698718"],"pubmed_authors":["Pope SJA","Knighton RC","Beames JM"],"additional_accession":[]},"is_claimable":false,"name":"Polycationic Ru(II) Luminophores: Syntheses, Photophysics, and Application in Electrostatically Driven Sensitization of Lanthanide Luminescence.","description":"A series of photoluminescent Ru(II) polypyridine complexes have been synthesized in a manner that varies the extent of the cationic charge. Two ligand systems (L1 and L2), based upon 2,2'-bipyridine (bipy) mono- or difunctionalized at the 5- or 5,5'-positions using <i>N</i>-methylimidazolium groups, were utilized. The resulting Ru(II) species therefore carried +3, +4, +6, and +8 complex moieties based on a [Ru(bipy)<sub>3</sub>]<sup>2+</sup> core. Tetra-cationic [Ru(bipy)<sub>2</sub>(<b>L2</b>)][PF<sub>6</sub>]<sub>4</sub> was characterized using XRD, revealing H-bonding interactions between two of the counteranions and the cationic unit. The ground-state features of the complexes were found to closely resemble those of the parent unfunctionalized [Ru(bipy)<sub>3</sub>]<sup>2+</sup> complex. In contrast, the excited state properties produce a variation in emission maxima, including a bathochromic 44 nm shift of the <sup>3</sup>MLCT band for the tetra-cationic complex; interestingly, further increases in overall charge to +6 and +8 produced a hypsochromic shift in the <sup>3</sup>MLCT band. Supporting DFT calculations suggest that the trend in emission behavior may, in part, be due to the precise nature of the LUMO and its localization. The utility of a photoactive polycationic Ru(II) complex was then demonstrated through the sensitization of a polyanionic Yb(III) complex in free solution. The study shows that electrostatically driven ion pairing is sufficient to facilitate energy transfer between the <sup>3</sup>MLCT donor state of the Ru(II) complex and the accepting <sup>2</sup>F<sub>5/2</sub> excited state of Yb(III).","dates":{"release":"2023-01-01T00:00:00Z","publication":"2023 Dec","modification":"2025-04-26T11:50:00.671Z","creation":"2025-04-06T13:47:09.996Z"},"accession":"S-EPMC10698718","cross_references":{"pubmed":["37984058"],"doi":["10.1021/acs.inorgchem.3c02352"]}}