Vapor-Induced Assembly of a Platinum(II) Complex Loaded on Layered Double Hydroxide Nanoparticles

Tamami Morimoto; Masaki Yoshida; Ayana Sato-Tomita; Shunsuke Nozawa; Junichi Takayama; Satoshi Hiura; Akihiro Murayama; Atsushi Kobayashi; Masako Kato

doi:10.1002/chem.202301993

Vapor-Induced Assembly of a Platinum(II) Complex Loaded on Layered Double Hydroxide Nanoparticles

Chemistry. 2023 Oct 26;29(60):e202301993. doi: 10.1002/chem.202301993. Epub 2023 Sep 29.

Authors

Tamami Morimoto¹, Masaki Yoshida², Ayana Sato-Tomita³, Shunsuke Nozawa⁴, Junichi Takayama⁵, Satoshi Hiura⁵, Akihiro Murayama⁵, Atsushi Kobayashi¹, Masako Kato²

Affiliations

¹ Department of Chemistry, Faculty of Science, Hokkaido University, North-10 West-8, Kita-ku, Sapporo, Hokkaido, 060-0810, Japan.
² Department of Applied Chemistry for Environment, School of Biological and Environmental Sciences, Kwansei Gakuin University, 1 Gakuen-Uegahara, Sanda, Hyogo, 669-1330, Japan.
³ Division of Biophysics, Department of Physiology, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke, Tochigi, 329-0498, Japan.
⁴ Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki, 305-0801, Japan.
⁵ Faculty of Information Science and Technology, Hokkaido University, North-14 West-9, Kita-ku, Sapporo, Hokkaido, 060-0814, Japan.

PMID: 37581259
DOI: 10.1002/chem.202301993

Abstract

Controlled self-assembly of Pt^II complexes is key to the development of optical and stimuli-responsive materials, but designing and precisely controlling them is still difficult owing to weak intermolecular interactions. Herein, we report the successful water-vapor-induced assembly of an anionic Pt^II complex [Pt(CN)₂ (ppy)]^- (Hppy=2-phenylpyridine) electrostatically loaded onto cationically charged layered double hydroxide (LDH) nanoparticles consisting of Mg²⁺ and Al³⁺ ions. When the Pt^II complexes were densely loaded onto the LDH nanoparticles, the assembly was maintained, even in dilute aqueous media. In the case of sparse loading, the Pt^II complexes were loaded discretely in the dry state; however, when water vapor was adsorbed, the increased mobility of the Pt^II complexes led to their assembly on the LDH nanoparticles. The presence of water vapor led to a drastic change in luminescence from green to orange.

Keywords: layered double hydroxides; luminescence; nanoparticles; platinum complexes; vapochromism.

Abstract

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