Synthesis, crystal structure and magnetic properties of dinuclear Ni IILnIII complexes based on a flexible polydentate ligand

Qi Wei Xie, Shu Qi Wu, Cai Ming Liu, Ai Li Cui, Hui Zhong Kou

研究成果: Contribution to journalArticle査読

21 被引用数 (Scopus)

抄録

The synthesis and characterization of three isomorphous complexes [Ni II(L)LnIII(DBM)3] (Ln = Gd (1·2.5CH 3CN·0.5H2O), Tb (2·2CH3CN· 0.5MeOH), and Dy (3·2CH3CN·0.5MeOH·0.5H 2O)) are reported (H2L = N,N′-dimethyl-N,N′- (2-hydroxy-3-methoxy-5-methylbenzyl)ethylenediamine, DBM- = anion of 1,3-diphenylpropane-1,3-dione). The flexible ligand L2- contains an N2O2-inner and an O4-outer coordination site. There are diphenoxo bridges between NiII and LnIII ions in these complexes. The remaining coordination sites are occupied by DBM - anions. Direct current (dc) magnetic susceptibility measurements indicate the presence of intramolecular ferromagnetic interactions in desolvated complexes 1-3. The magnetic coupling constant JNiGd in complex 1 is estimated to be 1.11 cm-1 (H = -2JNiGdSNiS Gd). Alternating current (ac) magnetic susceptibility studies reveal that complexes 2 and 3 show frequency-dependent out-of-phase signals, which indicate that they exhibit SMM behavior. The energy barriers for complexes 2 and 3 under a 2 kOe applied direct current (dc) magnetic field are estimated from Arrhenius plots to be 14.4 and 11.3 K, respectively.

本文言語英語
ページ(範囲)11227-11233
ページ数7
ジャーナルDalton Transactions
42
31
DOI
出版ステータス出版済み - 8 21 2013
外部発表はい

All Science Journal Classification (ASJC) codes

  • 無機化学

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