Circularly Polarized Luminescence Active Supramolecular Nanotubes Based on Pt(II) Complexes that Undergo Dynamic Morphological Transformation and Helicity Inversion

• Published in: Angewandte Chemie International Edition
• Main Authors: Kang, Seok Gyu, Kim, Ka Young, Cho, Yumi, Jeong, Dong Yeun, Lee, Ji Ha, Nishimura, Tomoki, Lee, Shim Sung, Kwak, Sang Kyu, You, Youngmin, Jung, Jong Hwa
• Format: Journal Article
• Language: English
• Published: Germany 15.06.2022
• Subjects: circularly polarized luminescence; Supramolecular Nanotube; Pt(II) Complex; Helicity Inversion; Morphological Transformation
• ISSN: 1521-3773
• DOI: 10.1002/anie.202207310

Circularly polarized luminescence (CPL) exhibiting tunable chirality is currently a challenging issue in developing supramolecular nanomaterials. We herein report the formation of helical nanoribbons which grow to helical tubes via dynamic helicity inversion. For this, chiral Pt(II) complexes of terpyridine derivatives, S-trans- 1 and R-trans- 1 , with respective S - and R -alanine subunit incorporating trans -double bond in the alkyl chain were prepared. In DMSO/H 2 O (5:1 v / v ), S-trans- 1 initially forms fibrous self-assembled product and then allows the dynamic transformation to helical tubes ( left-handed or M -type) through helical ribbons ( right-handed or P -type). Interestingly, the both helical supramolecular architectures are capable of emitting CPL signals. The metastable helical ribbons show CPL signals ( g lum = ±4.7 x 10 -2 ) at 570 nm. Meanwhile, the nanotubes as a thermodynamic product show the intense CPL signals ( g lum = ±5.6 x 10 -2 ) at 610 nm accompanying the helicity inversion. This study provides an efficient way to develop highly dissymmetric CPL nanomaterials by regulating the morphology of metallosupramolecular architectures.