Phosphorescent Pt(<scp>ii</scp>) complexes bearing a monoanionic C^N^N luminophore and tunable ancillary ligands

Hebenbrock, Marian; Stegemann, Linda; Kösters, Jutta; Doltsinis, Nikos L.; Müller, Jens; Strassert, Cristian A.

doi:10.1039/c7dt00393e

Cited by 25 publications

(36 citation statements)

References 95 publications

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“…The signals observed at ca. 500 and 550 nm are due to vibrationally resolved metal‐perturbed ligand‐centred emissive states of monomeric Pt II complexes with an admixture of a marginal MLCT character . In contrast, the signal at ca.…”

Section: Resultsmentioning

confidence: 94%

“…In contrast, the signal at ca. 600 nm can be assigned to a metal–metal‐to‐ligand charge transfer (MMLCT) emission, indicating an intermolecular Pt ··· Pt interaction and hence the formation of aggregates of Pt II complexes …”

Section: Resultsmentioning

confidence: 99%

“…General Considerations: All commercially available solvents and reagents were of analytical grade and used without further purification, except for triethylamine, which was dried with CaH 2 . Benzyl azide and 2‐ethynyl‐6‐phenylpyridin were synthesized according to literature procedures , . Degassed reactions were carried out in an argon atmosphere.…”

Section: Methodsmentioning

confidence: 99%

“…We have recently reported the synthesis and phosphorescent properties of a series of Pt II complexes bearing the cyclometallating N^N^C ligand 2‐(1‐benzyl‐1 H ‐1,2,3‐triazol‐4‐yl)‐6‐phenylpyridine . The 2‐(1 H ‐1,2,3‐triazol‐4‐yl)‐6‐phenylpyridine core of this ligand can easily be modified with different substituents at the triazole moiety.…”

Section: Introductionmentioning

confidence: 99%

“…We have recently reported the synthesis and phosphorescent properties of a series of Pt II complexes bearing the cyclometallating N ∧ N ∧ C ligand 2-(1-benzyl-1H-1,2,3-triazol-4-yl)-6-phenylpyridine. [17] The 2-(1H-1,2,3-triazol-4-yl)-6-phenylpyridine core of this ligand can easily be modified with different substituents at the triazole moiety. We therefore set out to create a family of phosphorescent Pt II complexes with DNA groove-binding ability, based on the above-mentioned considerations regarding optimal properties of such systems.…”

Section: Introductionmentioning

confidence: 99%

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DNA Groove‐binding Ability of Luminescent Platinum(II) Complexes based on a Family of Tridentate N^N^C Ligands Bearing Differently Substituted Alkyl Tethers

Hebenbrock

Gonzalez-Abradelo

Strassert

et al. 2018

Zeitschrift anorg allge chemie

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A family of luminescent PtII complexes is presented capable of binding DNA duplexes via groove binding. The complexes are based on a tridentate ligand with N^N^C donor functionality bearing a triazole, a pyridine and a phenyl entity. The triazole group is used to attach a series of pendant dodecane tethers with differently charged functional head groups (neutral hydroxyl group, anionic sulfate group, cationic tetraalkylammonium group). The DNA‐binding behavior of the three resulting PtII complexes was characterized by UV/Vis, CD, and luminescence spectroscopy as well as viscosity measurements and computational docking studies. The data clearly indicate groove binding interactions for all three complexes. In addition, a light‐switch effect was observed for the complexes upon the addition of DNA.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

DNA Groove‐binding Ability of Luminescent Platinum(II) Complexes based on a Family of Tridentate N^N^C Ligands Bearing Differently Substituted Alkyl Tethers

Hebenbrock

Gonzalez-Abradelo

Strassert

et al. 2018

Zeitschrift anorg allge chemie

Self Cite

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One Dianionic Luminophore with Three Coordination Modes Binding Four Different Metals: Toward Unexpectedly Phosphorescent Transition Metal Complexes

Kirse,

Maisuls,

Spierling

et al. 2023

Advanced Science

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This work herein reports on a battery of coordination compounds featuring a versatile dianionic luminophore adopting three different coordination modes (mono, bi, and tridentate) while chelating Pd(II), Pt(II), Au(III), and Hg(II). An in‐depth structural characterization of the ligand precursor (H2L) and six transition metal complexes ([HLPdCNtBu], [LPtCl], [LPtCNtBu], [LPtCNPhen], [HLHgCl], and [LAuCl]) is presented. The influence of the cations and coordination modes of the luminophore and co‐ligands on the photophysical properties (including photoluminescence quantum yields (ΦL), excited state lifetimes (τ), and average (non‐)radiative rate constants) are evaluated at various temperatures in different phases. Five complexes show interesting photophysical properties at room temperature (RT) in solution. Embedment in frozen glassy matrices at 77 K significantly boosts their luminescence by suppressing radiationless deactivation paths. Thus, the Pt(II)‐based compounds provide the highest efficiencies, with slight variations upon exchange of the ancillary ligand. In the case of [HLPdCNtBu], both ΦL and τ increase over 30‐fold as compared to RT. Furthermore, the Hg(II) complex achieves, for the first time in its class, a ΦL exceeding 60% and millisecond‐range lifetimes. This demonstrates that a judicious ligand design can pave the way toward versatile coordination compounds with tunable excited state properties.

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Modulation of Metallophilic and π–π Interactions in Platinum Cyclometalated Luminophores with Halogen Bonding

Sivchik

Kochetov

Eskelinen

et al. 2020

Chemistry A European J

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Luminescent cyclometalated complexes [M(C^N^N)CN] (M=Pt, Pd; HC^N^N=pyridinyl‐ (M=Pt 1, Pd 5), benzyltriazolyl‐ (M=Pt 2), indazolyl‐ (M=Pt 3, Pd 6), pyrazolyl‐phenylpyridine (M=Pt 4)) decorated with cyanide ligand, have been explored as nucleophilic building blocks for the construction of halogen‐bonded (XB) adducts using IC6F5 as an XB donor. The negative electrostatic potential of the CN group afforded CN⋅⋅⋅I noncovalent interactions for platinum complexes 1–3; the energies of XB contacts are comparable to those of metallophilic bonding according to QTAIM analysis. Embedding the chromophore units into XB adducts 1–3⋅⋅⋅IC6F5 has little effect on the charge distribution, but strongly affects Pt⋅⋅⋅Pt bonding and π‐stacking, which lead to excited states of MMLCT (metal–metal‐to‐ligand charge transfer) origin. The energies of these states and the photoemissive properties of the crystalline materials are primarily determined by the degree of aggregation of the luminophores via metal–metal interactions. The adduct formation depends on the nature of the metal and the structure of the metalated ligand, the variation of which can yield dynamic XB‐supported systems, exemplified by thermally regulated transition 3↔3⋅⋅⋅IC6F5.

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Phosphorescent Pt(ii) complexes bearing a monoanionic C^N^N luminophore and tunable ancillary ligands

Cited by 25 publications

References 95 publications

DNA Groove‐binding Ability of Luminescent Platinum(II) Complexes based on a Family of Tridentate N^N^C Ligands Bearing Differently Substituted Alkyl Tethers

DNA Groove‐binding Ability of Luminescent Platinum(II) Complexes based on a Family of Tridentate N^N^C Ligands Bearing Differently Substituted Alkyl Tethers

One Dianionic Luminophore with Three Coordination Modes Binding Four Different Metals: Toward Unexpectedly Phosphorescent Transition Metal Complexes

Modulation of Metallophilic and π–π Interactions in Platinum Cyclometalated Luminophores with Halogen Bonding

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