首页> 外文期刊>Acta crystallographica. Section C, Structural chemistry. >Side-on coordination mode of a pyrazolyl group in the structure of a divalent [Sm{B(3-Mepz)_4}_2] complex (3-Mepz is 3-methylpyrazol-1-yl)
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Side-on coordination mode of a pyrazolyl group in the structure of a divalent [Sm{B(3-Mepz)_4}_2] complex (3-Mepz is 3-methylpyrazol-1-yl)

机译:二价结构[SM {B(3-MEPZ)×4} _2]复合物(3-MEPZ是3-甲基吡唑-1-基)的侧向配位模式

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摘要

The discovery of polypyrazolylborate ligands allowed the development of various chemical fields and these ligands are an alternative to cyclopentadienyl, because both ligands have the same charge and donate the same number of electrons, as well as adopting the same facial geometry. Easy control of the bulkiness of polypyrazolylborate ligands is possible by modification of the substituents in the 3- and 5-positions of the pyrazolyl rings. The title complex, bis[tetrakis(3-methyl-1H-pyrazol-1-yl)borato]samarium(II), [Sm(C_16H_20BN_8)_2], was synthesized from the reaction of SmI_2 with potassium tetrakis(3-methyl-1H-pyrazol-1-yl)borate, denoted K[B(3-Mepz)_4], in tetrahydrofuran. The X-ray structure analysis revealed an unusual sie-on coordination mode of a 3-methylpyrazolyl group through an N=N group in the B(3-Mepz)_4 ligand. The distortion is defined by the B—N—N—Sm torsion angle [85.5 (4)°]. This is in contrast to the structure of the similar divalent samarium complex [Sm(Tp~Me2)_2] [Tp~Me2 is tris(3,5-dimethylpyrazol-1-yl)borate], which displays normal κ~3-bonding modes of the Tp~Me2 ligands.
机译:聚唑泊硼酸盐配体的发现允许开发各种化学领域,并且这些配体是环戊二烯基的替代物,因为两个配体都具有相同的电荷并捐赠相同数量的电子,以及采用相同的面部几何形状。通过修饰吡唑基环的3-和5位中的取代基可以轻松控制聚吡唑硼硼酸盐配体的大部分。标题复合物,双[四(3-甲基-1H-吡唑-1-基)硼酸盐]钐(II),[SM(C_16H_20BN_8)_2]由SMI_2与四氢钾(3-甲基 - 1H-吡唑-1-基)硼酸盐,在四氢呋喃中表示K [B(3-MEPZ)_4]。 X射线结构分析揭示了通过B(3-MEPZ)_4配体中的N = N基团的3-甲基吡唑基的不寻常的筛选配位模式。失真由B-N-N-SM扭转角度定义[85.5(4)°]。这与类似二价钐络合物的结构相反[SM(TP〜ME2)_2] [TP〜ME2是TRIS(3,5-二甲基吡唑-1-基)硼酸盐],其显示正常κ〜3键合TP〜ME2配体的模式。

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