New NIR-emissive tetranuclear Er(III) complexes with 4-hydroxo-2,1,3-benzothiadiazolate and dibenzoylmethanide ligands: Synthesis and characterization

Taisiya S. Sukhikh, Denis A. Bashirov, Natalia V. Kuratieva, Anton I. Smolentsev, Artem S. Bogomyakov, Vladimir A. Burilov, Asia R. Mustafina, Andrey V. Zibarev, Sergey N. Konchenko

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

New tetranuclear heteroleptic complexes [Er4(dbm)6(O-btd)4(OH)2] (1) and [Er4(dbm)4(O-btd)6(OH)2] (2) (O-btd = 4-hydroxo-2,1,3-benzothiadiazolate and dbm = dibenzoylmethanide) and their solvates with toluene, THF and CH2Cl2 were prepared using two synthetic approaches. The structures of the products were confirmed by single-crystal X-ray diffraction. Magnetic properties of 1 and 2 are in good agreement with X-ray data. The effective magnetic moment (μeff) values at 300 K for 1 and 2 corresponds to a system of 4 non-interacting Er(iii) ions in the ground state 4J15/2 with g = 6/5. At ambient temperature and upon excitation with λexc = 450 nm, complexes 1 and 2 exhibit luminescence at ∼1530 nm, i.e. in the near infra-red (NIR) region. The luminescence intensity grows with increasing the number of the (O-btd)- ligands in the complexes. This observation suggests (O-btd)- as a new efficient antenna ligand for the lanthanide-based NIR luminescence.

Original languageEnglish
Pages (from-to)5727-5734
Number of pages8
JournalDalton Transactions
Volume44
Issue number12
DOIs
Publication statusPublished - 28 Mar 2015

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