Mechanochromic luminescence properties of fluoro-substituted pinene-containing cyclometalated platinum(II) complexes with multiple triplet excited states

Persistent metal-free Room-Temperature Phosphorescence (RTP) materials attract significant interest owing to the production of long-lived triplet excited states. Although several organic designs show RTP, the impact of intermolecular interactions on the triplet excitons stabilization and migrations remains hardly understood because obtaining different ordered intermolecular interactions while conserving identical molecular electronic properties is very challenging. We propose here a new strategy to circumvent this problem by taking advantage of the distinct molecular packing that can be found between enantiomer and racemic forms of a chiral molecule. Structural, photophysical and chiroptical investigations of chiral cyclohexane bisphthalimide derivatives showed that heterochiral and homochiral dimer interactions play a crucial role on the triplet excited state stabilization, resulting in higher RTP efficiency for enantiopure systems than for racemic one. This study paves the way to the use of molecular chirality to rationalize supramolecular properties arising from subtle intermolecular interactions.<br>

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The influence of thiolate ligands on the luminescence properties of cycloplatinated(ii) complexes

Dalton Transactions ◽

10.1039/c7dt03599c ◽

2017 ◽

Vol 46 (45) ◽

pp. 15919-15927 ◽

Cited By ~ 13

Author(s):

Mahboubeh Jamshidi ◽

Mojgan Babaghasabha ◽

Hamid R. Shahsavari ◽

S. Masoud Nabavizadeh

Keyword(s):

Excited States ◽

Luminescence Properties ◽

Profound Change ◽

Thiolate Ligands ◽

Chloride Ligand ◽

Triplet Excited States

The replacement of a chloride ligand in cycloplatinated(ii) complexes with various thiolate ligands leads to a profound change in the nature of the lowest energy singlet and triplet excited states.

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Persistent Organic Room-Temperature Phosphorescence in Cyclohexane-Trans-1,2-Bisphthalimide Derivatives: The Dramatic Impact of Heterochiral vs. Homochiral Interactions

10.26434/chemrxiv.12458579 ◽

2020 ◽

Author(s):

Ludovic Favereau ◽

Cassandre Quinton ◽

Cyril Poriel ◽

Thierry Roisnel ◽

Denis Jacquemin ◽

...

Keyword(s):

Excited States ◽

Intermolecular Interactions ◽

Room Temperature ◽

Triplet Excited State ◽

Room Temperature Phosphorescence ◽

Significant Interest ◽

New Strategy ◽

Triplet Excited States ◽

The Impact ◽

Triplet Excitons

Persistent metal-free Room-Temperature Phosphorescence (RTP) materials attract significant interest owing to the production of long-lived triplet excited states. Although several organic designs show RTP, the impact of intermolecular interactions on the triplet excitons stabilization and migrations remains hardly understood because obtaining different ordered intermolecular interactions while conserving identical molecular electronic properties is very challenging. We propose here a new strategy to circumvent this problem by taking advantage of the distinct molecular packing that can be found between enantiomer and racemic forms of a chiral molecule. Structural, photophysical and chiroptical investigations of chiral cyclohexane bisphthalimide derivatives showed that heterochiral and homochiral dimer interactions play a crucial role on the triplet excited state stabilization, resulting in higher RTP efficiency for enantiopure systems than for racemic one. This study paves the way to the use of molecular chirality to rationalize supramolecular properties arising from subtle intermolecular interactions.<br>

Download Full-text