TY - JOUR
T1 - Structural and magnetic properties of mixed Co-Ln (Ln = Nd, Sm, Eu, Gd and Ho) diethyleneglycolate complexes
AU - Abdallah, A.
AU - Gaudisson, T.
AU - Sibille, R.
AU - Nowak, S.
AU - Cheikhrouhou-Koubaa, W.
AU - Shinoda, K.
AU - François, M.
AU - Ammar, S.
N1 - Publisher Copyright:
© The Royal Society of Chemistry.
PY - 2015/8/3
Y1 - 2015/8/3
N2 - New hybrid compounds LnCoCl(deg)2 (deg = diethyleneglycolate; Ln = Nd, Sm, Eu, Gd and Ho) have been synthesized by mixing cobalt and rare earth cations in a boiling diethyleneglycol (degH2) medium. Their crystallographic structures have been ab initio solved from synchrotron powder diffraction data. They consist of edge sharing tetrameric sub-units [(Ln2Co2)(deg)4(Cl)2] forming 1D infinite chains along the c parameter of a monoclinic unit cell (SG = C2/c). The five- and seven-coordination of Co2+ and Ln3+ cations inferred from the crystallographic results is confirmed by UV-visible absorption and Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy. In the LnCoCl(deg)2 (Ln = Nd, Sm, Eu, Gd, Ho) series, weak antiferromagnetic superexchange interactions have been evidenced, between high spin Co2+ and Ln3+ orbitally degenerate cations. These materials are considered as potential precursors for the simultaneous reduction of Co-Ln-glycolate species into bimetallic nanoparticles by the polyol process.
AB - New hybrid compounds LnCoCl(deg)2 (deg = diethyleneglycolate; Ln = Nd, Sm, Eu, Gd and Ho) have been synthesized by mixing cobalt and rare earth cations in a boiling diethyleneglycol (degH2) medium. Their crystallographic structures have been ab initio solved from synchrotron powder diffraction data. They consist of edge sharing tetrameric sub-units [(Ln2Co2)(deg)4(Cl)2] forming 1D infinite chains along the c parameter of a monoclinic unit cell (SG = C2/c). The five- and seven-coordination of Co2+ and Ln3+ cations inferred from the crystallographic results is confirmed by UV-visible absorption and Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy. In the LnCoCl(deg)2 (Ln = Nd, Sm, Eu, Gd, Ho) series, weak antiferromagnetic superexchange interactions have been evidenced, between high spin Co2+ and Ln3+ orbitally degenerate cations. These materials are considered as potential precursors for the simultaneous reduction of Co-Ln-glycolate species into bimetallic nanoparticles by the polyol process.
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U2 - 10.1039/c5dt02346g
DO - 10.1039/c5dt02346g
M3 - Article
AN - SCOPUS:84940867862
SN - 1477-9226
VL - 44
SP - 16013
EP - 16023
JO - Dalton Transactions
JF - Dalton Transactions
IS - 36
ER -