Supramolecular Lanthanide Complexes with Cucurbituril: Luminescence and Logic Devices

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Complexes of the composition [{DyxLn2–x(H2O)5(NO3)}2CB[6]] (NO3)4 · HNO3 · 6H2O (x = 1, Ln = Eu; x = 0.8, Gd, Ho) (I–III) were obtained from a mixture of lanthanide nitrates and cucurbit[6]uril (C36H36N24O12, CB[6]) in nitric acid upon heating at 100°C. According to X-ray diffraction analysis (XRD), the lanthanide cation in compounds I–III coordinates two oxygen atoms of the CB[6] molecule, H2O molecules, and nitrate ions. Compounds I–III were characterized by XRD, IR and ICP-OES spectroscopy, and elemental analysis. Based on the luminescence spectra, the chromaticity coordinates were determined, with values very close to those of white light. This feature results from the presence of two Dy3+-centered emission bands of comparable intensity, one of which — the hypersensitive transition 4F9/2 → 6H13/2 — is due to the relatively high symmetry of the lanthanide coordination environment, close to C4v. Additionally, a distinctive feature of compounds I–III is the strong dependence of their luminescence spectra on the excitation wavelength. Based on this phenomenon, models of molecular logic devices have been proposed, capable of switching the luminescent signal upon irradiation with light of different wavelengths.

作者简介

M. Rakhmanova

Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences

Email: rakhmanova_m@mail.ru
ORCID iD: 0000-0003-2275-8931
PhD in Physics and Mathematics, Senior Researcher Novosibirsk, Russian Federation

T. Sukhikh

Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences

Email: sukhikh@niic.nsc.ru
ORCID iD: 0000-0001-5269-9130
PhD in Chemistry, Senior Researcher Novosibirsk, Russian Federation

E. Kovalenko

Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences

Email: e.a.kovalenko@niic.nsc.ru
ORCID iD: 0000-0002-2169-9768
PhD in Chemistry, Senior Researcher Novosibirsk, Russian Federation

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