Copper(II) complexes with 2,5-bis(2-pyridyl)pyrazine and 1,1,3,3-tetracyano-2-ethoxypropenide anion: Syntheses, crystal structures and magnetic properties
作者:Consuelo Yuste、Abdeslem Bentama、Nadia Marino、Donatella Armentano、Fatima Setifi、Smail Triki、Francesc Lloret、Miguel Julve
DOI:10.1016/j.poly.2009.02.029
日期:2009.5
the magnetic properties of 1 and 2 in the temperature range 1.9–295 K reveal a Curie law behaviour for 1 and a very weak ferromagnetic interaction for 2 . The poor ability of the 2,5-dpp ligand to mediate magnetic interactions between the copper(II) ions in the 2,5-dpp-bridged copper(II) complexes contrast with the somewhat better ability of the pyrazine ring in related pyrazine-bridged copper(II)
式[Cu 2(2,5-dpp)(H 2 O)4(CF 3 SO 3)4]·2H 2 O(1)和[Cu 2(2,5-dpp)的铜(II)配合物(H 2 O)2(tcnoet)4] n(2)[2,5-dpp = 2,5-双(2-吡啶基)吡嗪和tcnoet-= 1,1,3,3-四氰基-2-乙氧基丙烯阴离子]已制备,其结构通过X射线晶体学方法确定。化合物1是双核络合物,其中2,5-dpp分子充当两个铜中心之间的双齿双桥,电子中性是通过四个末端结合的三氟甲磺酸根阴离子实现的。每个铜(II)离子都呈现一个细长的八面体CuN 2 O 4环境,其中两个2,5-dpp的氮原子和两个在基面上的水分子在轴向位置和两个三氟甲磺酸盐原子。化合物2是带有规则交替的2,5-dpp和双tcnoet基团作为桥的铜(II)离子之字形链。每个铜(II)离子都具有一个细长的八面体CuN 5 O,周围有四个氮原子,两个来自2,5-