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February 5, 2026Angewandte Chemie International Edition2 citationsOpen Access

A Metallosupramolecular Receptor for Squaraine Dyes Enabling Ultrafast Dark Resonance Energy Transfer

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DCDamien W. ChenTDTejas DeshpandeSCSybille Collignon

Key Points

  • This research aims to explore the energy transfer capabilities of a metal-organic cage receptor for squaraine dyes.
  • Synthesis of a metal-organic cage using acridone-based dipyridyl ligands with Pd2+ ions.
  • Evaluation of binding preference for squaraine dyes with specific substituents.
  • Photoexcitation studies to analyze energy transfer rates.
  • Use of circular dichroism spectroscopy to observe chirality transfer.
  • The cage demonstrated a strong preference for squaraine dyes with 2,6-dihydroxyphenyl substituents.
  • Ultrafast dark resonance energy transfer (sub-ps timescale) was achieved, leading to enhanced near-infrared emission.
  • Pseudo-Stokes shifts of up to 440 nm were recorded during the energy transfer process.
  • Chirality transfer from the dye to the cage was confirmed via circular dichroism.

Abstract

ABSTRACT A metal‐organic cage was obtained by combining acridone‐based dipyridyl ligands with Pd 2+ ions. The cage acts as a potent receptor for squaraine dyes, with a pronounced preference for guests with 2,6‐dihydroxyphenyl substituents. This selectivity profile differs from that of previously reported receptors for squaraine dyes. The acridone‐based cage itself is non‐emissive. Upon its photoexcitation, ultrafast (sub‐ps) dark resonance energy transfer (DRET) to the encapsulated squaraine dyes was observed, resulting in bright, near‐infrared guest emission, with pseudo‐Stokes shifts of up to 440 nm. Upon binding of a chiral dye, chirality transfer to the host could be evidenced by circular dichroism spectroscopy.

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Cite This Study

Chen et al. (2026) studied this question.

synapsesocial.com/papers/69843360f1d9ada3c1fb0817https://doi.org/10.1002/anie.2203782
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Also Consider

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  1. 1A Metallosupramolecular Receptor for Squaraine Dyes Enabling Ultrafast Dark Resonance Energy Transfer2026
  2. 2Tuning Optical Absorption and Photovoltaic Performance for Novel Near-Infrared Squaraine Molecules in Dye-Sensitized Solar Cells.2025
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  4. 4Structural, Optical Spectroscopic, and Density Functional Theory Calculations of Squaraine Dye for Organic Electronic Applications2024
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