Ferromagnetically Coupled Molecular Complexes with a CoII2GdIII Pivalate Core: Synthesis, Structure, Magnetic Properties and Thermal Stability. Issue 48 (20th December 2019)

• Record Type: Journal Article
• Authors: Lutsenko, Irina A.; Kiskin, Mikhail A.; Nikolaevskii, Stanislav A.; Starikova, Alyona A.; Efimov, Nikolay N.; Khoroshilov, Andrey V.; Bogomyakov, Artem S.; Ananyev, Ivan V.; Voronina, Julia K.; Goloveshkin, Alexander S.; Sidorov, Aleksey A.; Eremenko, Igor L.
• Is Part Of: ChemistrySelect. Volume 4:Issue 48(2019)
• Page Start: 14261
• Page End: 14270
• Publication Date: 2019-12-20
• Subjects: cobalt(II) -- crystal structure -- gadolinium(III) -- heterometallic carboxylate complexes -- magnetic properties; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201904585
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: New adducts with the composition [Co2 Gd(NO3 )(Piv)6 L2 ] (L=2, 4‐lutidine (lut) (1 ), 2‐phenylpyridine (PhPy) (4 ), 2‐ethynylpyridine (EtPy) (5 )) and [Co2 Eu(NO3 )(Piv)6 (EtPy)2 ] (6 ) were synthesized. According to X‐ray diffraction data, the molecular complexes comprise two atoms of cobalt(II) and one central atom of gadolinium(III) bridged by carboxylate ligands. The donor base molecules are coordinated to cobalt atoms. Magnetic measurements of the new and previously synthesized complexes with quinoline (2 ) and pyridine (3 ) ligands showed the ferromagnetic nature of the coupling between the metal centers in the Co II 2 Gd III core with J Co‐Gd parameters in the range of 0.15−0.18 cm −1 . DFT calculations supported the ferromagnetic type of coupling for these complexes. Simultaneous thermal analysis of 1 and 2 showed the thermal stability of the complexes up to 180 °C and the stepwise nature of thermolysis, which includes the stages of elimination of the donor base molecules and the thermal decomposition of the pivalate moieties in the complex. Abstract : New adducts with the composition [Co2 Gd(NO3 )(Piv)6 (R−Py)2 ] were synthesized and characterized in detail. Magnetic measurements revealed ferromagnetic coupling between the metal centers in the Co II 2 Gd III metal core with J Co‐Gd parameters in the range of 0.15−0.18 cm −1 . DFT calculations supported the ferromagnetic type of coupling for these complexes.