A mononuclear Ni(ii) complex: a field induced single-molecule magnet showing two slow relaxation processes

Autor:	Ján Titiš, Jozef Miklovič, Roman Boča, Dušan Valigura
Rok vydání:	2015
Předmět:	Chemistry Stereochemistry Relaxation (NMR) Hexacoordinate chemistry.chemical_element Chromophore Inorganic Chemistry Magnetic anisotropy chemistry.chemical_compound Nickel Crystallography Single-molecule magnet Hydroxymethyl Superparamagnetism
Zdroj:	Dalton Transactions. 44:12484-12487
ISSN:	1477-9234 1477-9226
DOI:	10.1039/c5dt01213a
Popis:	The mononuclear complex [Ni(pydc)(pydm)]·H2O, pyridine-2,6-dicarboxylato-2,6-bis(hydroxymethyl)pyridine nickel(ii) monohydrate, features a highly axially compressed pseudo-octahedral chromophore with significant rhombic contribution that is responsible for the sizable magnetic anisotropy of the Ni(ii) ion, D/hc≈-14 cm(-1). This complex displays superparamagnetic behaviour in an applied external field that culminates at BDC = 0.2 T. Two relaxation processes are evidenced; the faster can be analyzed in terms of the Orbach, direct, and Raman processes yielding U/kB = 21.2 (±1.3) K and τ0 = 3.83 (±1.21) × 10(-7) s. This is the first example of a field-induced single-molecule magnet in the class of hexacoordinate Ni(ii) complexes.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3cf8b85904ba0e8e0a7fd27ed6e6fbe4 https://doi.org/10.1039/c5dt01213a Zobrazit plný text záznamu