Mr. Segawa (D1)’s work on color-tunable, high-efficiency emission in 1D mixed Pt(II)/Pd(II) stacked crystals is published in Angewandte Chemie International Edition.

A study led by Mr. Segawa (D1) has been published in Angewandte Chemie International Edition, reporting pronounced enhancement of photoluminescence quantum yield and emission-color tuning in mixed-metal crystals where platinum(II) and palladium(II) complexes are arranged in one-dimensional chains. In this work, mixed crystals composed of square-planar Pt(II) and Pd(II) complexes, K[M(CN)₂(dFppy)]·H₂O (M = Pt²⁺, Pd²⁺), were synthesized and their luminescence properties were systematically investigated. The mixed crystals retained the same crystal structure as the corresponding single-metal crystals and formed one-dimensional stacked architectures featuring short metal–metal interactions.

As a result, emission originating from metal–metal interactions was observed, and notably, crystals with a Pt/Pd ratio of 1:2 exhibited a high room-temperature photoluminescence quantum yield (Φ = 0.64). These distinctive emission characteristics can be explained by energy transfer among multiple emissive sites along the one-dimensional chains, and this study provides a new design guideline for luminescent materials based on mixing different metal species.

“Enhancement of Emission Efficiency and Color Tuning by Mixing Platinum(II) and Palladium(II) Complexes in a One-dimensional Chain” 
Kaito Segawa, Masaki Yoshida,* Hiroto Kise, Junichi Takayama, Satoshi Hiura, Akihiro Murayama, Satoki Okabayashi, Motohiro Tsuboi, Ken Onda, and Masako Kato*
Angew. Chem. Int. Ed. e202513282 (2025).