Journal
JOURNAL OF PORPHYRINS AND PHTHALOCYANINES
Volume 24, Issue 1-3, Pages 238-246Publisher
WORLD SCI PUBL CO INC
DOI: 10.1142/S1088424619501037
Keywords
porphyrinoids; copper(II)porphyrin; porphyrin dimers; magnetic interactions; antiferromagnetic coupling
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Funding
- University of Strasbourg
- CNRS
- FRC-Labex CSC [ANR-10-LABX-0026 CSC]
- French Ministry of Research
- NSERC of Canada
- French EPR Federation of Research (RENARD) [IR-RPE CNRS 3443]
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The synthesis of porphyrin dimers linked by metal ions is described and the X-ray structure of two new dimers is presented. As previously shown for diamagnetic metal ions, strong electronic interactions between the individual subunits were observed. Antiferromagnetic coupling between copper(II)porphyrins linked by palladium(II) or copper(II) ions was studied by EPR and SQUID measurements. For the palladium(II)-linked dimer, the very small antiferromagnetic coupling was estimated by EPR measurements (J < -1 cm(-1)). For the trinuclear-copper(II)-linked dimer, a large antiferromagnetic coupling between the copper(II) ions was measured. In this trinuclear compound, the linking copper(II) ion is used as a relay to increase the interaction between the two copper(II)porphyrins.
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