Single molecule magnetic behaviour in lanthanide naphthalenesulfonate complexes.
Guo PengYing-Ying ZhangBo LiXiao-Fan SunHong-Ling CaiDe-Jing LiZhi-Gang GuGeorge E KostakisPublished in: Dalton transactions (Cambridge, England : 2003) (2018)
The use of 2-naphthalenesulfonate (NAS) ligand in lanthanide chemistry afforded a family of isostructural mononuclear lanthanide complexes with the formula [Ln(NAS)2(H2O)6](NAS)·3H2O [Ln = Tb (1), Dy (2), Er (3), Yb (4)]. Crystallographic studies determined a square antiprismatic geometry (D4d) for the Ln centre and crystallization in an unprecedented chiral space group. The latter was further confirmed by the observation of Cotton effects in single crystal circular dichroism (CD) spectra. Static and dynamic magnetic measurements identified weak intermolecular dipolar interactions in 2, and such effects can be waived by dilution, which was noted by the detection of zero-field single molecule magnet (SMM) behaviour and hysteresis loop in a magnetically diluted sample (5). Compounds 2-4 exhibit SMM behaviours with energy barriers of 53, 32, and 45 K, respectively. To the best of our knowledge, these complexes are the first examples of pure 4f sulfonate-based SMMs.
Keyphrases
- single molecule
- atomic force microscopy
- living cells
- molecularly imprinted
- mycobacterium tuberculosis
- peripheral blood
- energy transfer
- liquid chromatography tandem mass spectrometry
- mass spectrometry
- ionic liquid
- human milk
- density functional theory
- estrogen receptor
- preterm infants
- high resolution
- gas chromatography
- endoplasmic reticulum
- liquid chromatography
- molecular dynamics
- sensitive detection
- nk cells
- high speed
- simultaneous determination