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Trinuclear CoIILnIIICoII Complexes (Ln = La, Ce, Nd, Sm, Gd, Dy, Er, and Yb) with 2,6-Dipicolinoylbis(N,N-diethylthiourea): Synthesis, Structures, and Magnetism.
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2019-12-16 , DOI: 10.1021/acs.inorgchem.9b02648
Jecob J Jesudas 1 , Chien Thang Pham 2 , Adelheid Hagenbach 1 , Ulrich Abram 1 , Hung Huy Nguyen 2
Affiliation  

One-pot reactions of 2,6-dipicolinoylbis(N,N-diethylthiourea) (H2L) with Co(CH3COO)2·4H2O and LnCl3, where Ln = La, Ce, Nd, Sm, Gd, Dy, Er, and Yb, in warm methanol in the presence of Et3N, give stable trinuclear complexes of the composition [LnCo2(L)2(μ1,3-OOCCH3)2X] ("CoLnCo" complexes), where X- = κ2-CH3COO- or Cl-. X-ray structure determinations reveal symmetric trinuclear complexes containing two organic ligands (L2-), two terminal CoII ions, and one central LnIII ion. The organic ligands coordinate equatorially to the two CoII ions via two bidentate (O,S) N-acylthiourea moieties and tridentate to the central Ln ion via the (O,N,O) 2,6-dipicolinoyl moieties. Two acetate bridges established between each of the terminal Co and central Ln ions complete the square-pyramidal coordination spheres of CoII. All products possess an additional chlorido ligand axially coordinated to the lanthanide except the gadolinium(III) and lanthanum(III) complexes, where bidentate acetato ligands are coordinated. Fitting the χmT versus T data of the "CoLaCo" complex gives the axial and rhombic zero-field-splitting parameters D = 24.3(4) cm-1 and E = -1.0(2) cm-1, respectively, and anisotropic Landé values gx,y = 2.81(1) and gz = 2.00 as well as weak antiferromagnetic interactions between two high-spin CoII centers with J = -0.49(2) cm-1. The nature of the magnetic interactions between the LnIII ions and the CoII ions in the "CoLnCo" complexes is deduced by comparing their χMT values to the sum of χMT values of the analogous "CoLaCo" and related "ZnLnZn" complexes. The "CoDyCo" complex reveals an antiferromagnetic interaction, while the remaining "CoLnCo" complexes show ferromagnetic interactions.

中文翻译:

三核CoIILnIIICoII配合物(Ln = La,Ce,Nd,Sm,Gd,Dy,Er和Yb)与2,6-二吡啶甲酰基双(N,N-二乙基硫脲)的合成,结构和磁性。

2,6-二吡啶啉基双(N,N-二乙基硫脲)(H2L)与Co(CH3COO)2·4H2O和LnCl3的一锅反应,其中Ln = La,Ce,Nd,Sm,Gd,Dy,Er和Yb在Et3N存在下于温暖的甲醇中,可得到组成为[LnCo2(L)2(μ1,3-OOCCH3)2X]的稳定三核配合物(“ CoLnCo”配合物),其中X- =κ2-CH3COO-或Cl- 。X射线结构测定表明,对称的三核络合物包含两个有机配体(L2-),两个末端CoII离子和一个中心LnIII离子。有机配体通过两个双齿(O,S)N-酰基硫脲部分与两个CoII离子进行赤道配位,并通过(O,N,O)2,6-二吡啶啉基部分与中心Ln离子进行三齿配位。在末端Co离子和中心Ln离子之间建立的两个乙酸酯桥完成了CoII的方锥配位球。除了products(III)和镧(III)配合物(其中双齿乙酸酯配体被配位)以外,所有产品均具有与镧系元素轴向配位的其他氯代配体。拟合“ CoLaCo”复合体的χmT与T数据,分别得出轴向和菱形零场分裂参数D = 24.3(4)cm-1和E = -1.0(2)cm-1,以及各向异性Landé值gx,y = 2.81(1)和gz = 2.00以及两个J = -0.49(2)cm-1的高自旋CoII中心之间的弱反铁磁相互作用。通过将“ CoLnCo”络合物中LnIII离子和CoII离子之间的磁性相互作用的性质,通过将它们的χMT值与类似的“ CoLaCo”和相关“ ZnLnZn”络合物的χMT值之和进行比较来推导。“ CoDyCo”
更新日期:2019-12-17
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