Syntheses, structure, magnetic and thermodynamics property of novel lanthanide complexes with nitronyl nitroxide radical

Song, Mei-Ying; Hou, Yi-Fang; Wen, Long-Mei; Wang, Shuping; Yang, Siluo; Zhang, Jianjun; Geng, Lin; Shi, Shikao

doi:10.1016/j.molstruc.2015.11.016

Cited by 5 publications

(1 citation statement)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Gd–O(hfac) bond lengths are in the range of 2.342(4)–2.389(4) Å, and the Gd–O(rad) distances are 2.494(3) and 2.364(3) Å, respectively. These bond distances are in good agreement with other Gd(hfac) 3 –nitronyl nitroxide complexes . The dihedral angles between the benzene ring and ON–C–NO of two monoradicals are 33.00(1)° and 28.95(2)°, respectively.…”

Section: Resultssupporting

confidence: 87%

Functionalized Nitronyl Nitroxide Biradicals for the Construction of 3d–4f Heterometallic Compounds

Sun

Yang

et al. 2018

Inorg. Chem.

View full text Add to dashboard Cite

Functionalized nitronyl nitroxide biradical ligands incorporating pyridine groups hold Co and Ln ions together, creating biradical-based 3d-4f tetranuclear complexes [LnCo(hfac)(NITPhPybis)] [Ln = Gd (1), Tb (2), Dy (3), and Ho (4); NITPhPybis = 5-(4-pyridyl)-1,3-bis(1'-oxyl-3'-oxido-4',4',5',5'-tetramethyl-4,5-hydro-1 H-imidazol-2-yl)benzene; hfac = hexafluoroacetylacetonate]. These complexes have a centrosymmetric cyclic molecular structure in which two biradicals perform as tetradentate ligands to bind two Co and two Ln ions, resulting in a rare octaspin system. Direct-current (dc) magnetic susceptibility studies reveal that the strong antiferromagnetic Co-NO magnetic exchange dominates the present magnetic system, while magnetic coupling of Gd-ON is ferromagnetic. Analysis of the magnetic data of the Gd complex allows us to determine the magnetic parameters through the appropriate magnetic model. Alternating-current (ac) magnetic susceptibility investigations indicate that 2 displays frequency-dependent out-of-phase signals under a zero dc field, while ac magnetic susceptibilities of 3 show field-induced frequency dependence, which is a typical feature of slow relaxation of the magnetization. Complexes 1-4 represent the first nitronyl nitroxide biradical-based 3d-4f compounds.

show abstract

Section: Resultssupporting

confidence: 87%