Sandwich double-decker Er(iii) and Yb(iii) complexes containing naphthalocyanine moiety: synthesis and investigation of the effect of a paramagnetic metal center
| Autor: | Anton D. Kosov, Nataliya E. Borisova, I.F. Gilmutdinov, George V Mamin, Alexander L. Trigub, Sergey V Tokarev, Victor E. Pushkarev, Elizaveta F. Petrusevich, Larisa G. Tomilova, Artem A. Masitov, Tatiana V. Dubinina |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Lanthanide
Ionic radius Materials science Naphthalocyanine 010405 organic chemistry 010402 general chemistry 01 natural sciences 0104 chemical sciences law.invention Inorganic Chemistry Paramagnetism Crystallography chemistry.chemical_compound chemistry law Bathochromic shift Proton NMR Homoleptic Electron paramagnetic resonance |
| Zdroj: | Dalton transactions (Cambridge, England : 2003). 48(35) |
| ISSN: | 1477-9234 |
| Popis: | Novel heteroleptic Er(iii) and Yb(iii) naphthalocyaninato-phthalocyaninates containing an octa-phenyl or octa-phenoxysubstituted naphthalocyanine deck were synthesised and identified by 1H NMR, EPR and high resolution MALDI-TOF/TOF mass spectrometry. Direct synthesis of novel homoleptic Yb(iii) bis (octa-phenylnaphthalocyaninate) was carried out. Downfield lanthanide induced shifts of the aromatic protons in target compounds were observed compared with the corresponding diamagnetic Lu(iii) complexes. In the near-IR absorption spectra, an increase in ionic radius from Lu(iii) to Er(iii) resulted in a bathochromic shift of the intervalence band up to 1473 nm. This work presents the first experimental EPR study of Yb(iii) bis naphthalocyaninate, where a set of magnetic parameters and properties (including spin, magnitude and sign of magnetic anisotropy parameter D, increased splitting in a crystal field, ferromagnetic f-π interaction etc.) were determined and interpreted by both EPR and SQUID techniques and supported by theoretical considerations. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|