ArticleChemistry (Weinheim an der Bergstrasse, Germany)2025
Site-Selective Ligand Functionalization Reverses Hypsochromic Luminescence Shifts in Platinum(II) Complexes of Benzannulated NCN-Coordinating Ligands.
Article in Chemistry (Weinheim an der Bergstrasse, Germany), 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Platinum Complexes of TetradentateInorganic chemistry · 2025Article
- In Pursuit of Low Energy Phosphorescence: Late Metal Coordination Complexes of the Planar, π-extended Bipyridyl Ligand 6,6',7,7'-Biphenanthridine.Chemistry (Weinheim an der Bergstrasse, Germany) · 2025Article
- Structural Features and Photophysical and Antiproliferative Properties of MeInorganic chemistry · 2025Article
- Site-Selective Ligand Functionalization Reverses Hypsochromic Luminescence Shifts in Platinum(II) Complexes of Benzannulated NCN-Coordinating Ligands.Chemistry (Weinheim an der Bergstrasse, Germany) · 2025Article
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Authors and funding
5 authors.
Funding
Abstract
Ligands containing phenanthridine (benzo[c]quinoline) have presented notable exceptions to the conventional logic that increasing ligand benzannulation leads to bathochromic (red) shifts in the absorption and emission of their coordination complexes. The counterintuitive blue shifts have been attributed to the peculiar structure of phenanthridines, whose ground states are dominated by imine-bridged biphenyl resonance contributors. These serve to isolate the C=N unit electronically from the rest of the ligand framework and allow the C=N moiety to act as a 'shock-absorber', buffering against larger molecular distortions in a molecule's excited state, and reducing the observed pseudo-Stokes' shift. Here, we provide experimental evidence for this assertion in the form of a counterfactual that reverses this trend: substitution at the phenanthridine 6-position (i. e., at the C=N sub-unit) breaks the phenanthridine's tendency to cause hypsochromic luminescence shifts. The synthesis, full characterization, and comparison of 2-quinolinyl and 6-phenanthridinyl exemplars is provided, supported by a detailed theoretical treatment.
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Registered trials
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