Lanthanide Complexes of Tritopic Bis(hydrazone) Ligands: Single-Molecule Magnet Behavior in a Linear DyIII3 Complex

Autor:	Laurence K. Thompson, Muralee Murugesu, Santokh S. Tandon, Louise N. Dawe, Muhammad U. Anwar, Fatemah Habib
Rok vydání:	2011
Předmět:	chemistry.chemical_classification Lanthanide Chemistry Metal ions in aqueous solution Inorganic chemistry Hydrazone Ion Inorganic Chemistry Metal Crystallography visual_art visual_art.visual_art_medium Hydrazone ligand Single-molecule magnet Magnetic relaxation Physical and Theoretical Chemistry
Zdroj:	Inorganic Chemistry. 51:1028-1034
ISSN:	1520-510X 0020-1669
DOI:	10.1021/ic2022006
Popis:	Tritopic pyridinebis(hydrazone)-based ligands typically produce square M(9) [3 × 3] grid complexes with first-row transition-metal ions (e.g., M = Mn, Fe, Co, Cu, Zn), but with larger lanthanide ions, such coordination motifs are not produced, and instead linear trinuclear complexes appear to be a preferred option. The reaction of 2pomp [derived from pyridine-2,6-bis(hydrazone) and 2-acetylpyridine] with La(III), Gd(III), and Dy(III) salts produces helical linear trinuclear [Ln(3)(2pomp)(2)]-based complexes, where each metal ion occupies one of the three tridentate ligand pockets. Two ligands encompass the three metal ions, and internal connections between metal ions occur through μ-O(hydrazone) bridges. Coligands include benzoate, nitrate, and N,N-dimethylformamide. The linear Dy(III)(3) complex exhibits single-molecule magnet behavior, demonstrated through alternating-current susceptibility measurements. Slow thermal magnetic relaxation was detected in an external field of 1800 Oe, where quantum-tunneling effects were suppressed (U(eff) = 14 K).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ccb9a1afabfdada637152bd8b7f5f147 https://doi.org/10.1021/ic2022006 Zobrazit plný text záznamu