Abstract
Chiral oligopeptide-naphthalene/Eu(iii) hybridized luminophores emit strong circularly polarised solution-state luminescence (CPL) from Eu(iii) at 592 and 614 nm (|gCPL| ≤ 2.1 × 10−2). Although the peptide ligands have matching absolute configurations, the CPL sign is controllable by varying the number of naphthalene units and peptide/Eu(iii) coordination ratio.
Highlights
Yuki Mimura,a Takuya Sato,a Yuki Motomura,a Hiroki Yoshikawa,a Motohiro Shizuma, b Mizuki Kitamatsu*a and Yoshitane Imai *a
Two enantiomeric organometallic luminophores bearing opposite chirality are required for the selective emission of le -handed and right-handed circularly polarised solutionstate luminescence (CPL); such chiral organic ligands are not always synthetically tractable
It is highly desirable to develop a novel method for controlling the CPL sign of chiral organometallic luminophores without the need to synthesise their respective enantiomers
Summary
Yuki Mimura,a Takuya Sato,a Yuki Motomura,a Hiroki Yoshikawa,a Motohiro Shizuma, b Mizuki Kitamatsu*a and Yoshitane Imai *a. We report oligopeptide–Eu(III) hybridized luminophores, in which the signs of the Eu(III) CPL signals at the 5D0 / 7F1 and 5D0 / 7F2 transitions were subtly inverted in accordance with the number of naphthalene rings in the peptide and the coordination ratio of Eu(III) to peptide, despite the oligopeptide ligand having the same stereocentres (L or D). To characterise the photophysical properties of the L-1–L-4/ Eu (1/1 molar ratio) luminophores as a function of naphthalene unit number, the steady-state unpolarised photoluminescence (PL) and CPL spectra of dilute L-1–L-4/Eu and L-1–L-4 solutions in CHCl3 were obtained (Fig. 1 and ESI, Fig. S5–S9,† and Table 1).
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