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(1,3-Bis(2'-pyridylimino)isoindolinato)nickel(II) complexes of phenylcyanamido ligands: Crystal structure, solution and spectroscopic properties

机译:苯基氰酰胺基配体的(1,3-双(2'-吡啶基氨基)异吲哚并合)镍(II)配合物:晶体结构,溶液和光谱性质

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摘要

A series of 4-coordinate, neutral, approximately square planar (1,3-bis(2$sp prime$-pyridylimino)isoindolinato)Ni(II)(phenylcyanamido) complexes (i.e.(PVP)Ni(pcyd)) have been prepared and characterized by $sp1$H NMR, electronic absorption, and infrared spectroscopies and X-ray crytallography. Increasing the $pi$-donating ability of the phenylcyanamido ligand results in a diamagnetic to paramagnetic change in magnetic properties of the complexes. Tetrahedral distortion from the square plane is demonstrated by a crystal structure of (PVP)Ni(2-Clpcyd) which also shows ordered molecular stacking in the crystal lattice.;The PVP$spominus$ centered $pi$-$pispddagger$ electronic transitions of the (PVP)Ni (pcyd) complexes in low donating solvents shows a " mixing" effect attributed to an extension of conjugation resulting from $pi$ donation of the phenylcyanamido ligand mediated by a common Ni(II) $pi$ symmetry orbital within a square planar geometry.;Temperature dependent, reversible solvent coordination equilibria exist for the (PVP)Ni(pycd) complexes. The proportions of non-solvated and solvated complexes are characterized by changes in the apparent $pi$- mixing effect from which thermodynamic parameters are derived.
机译:制备了一系列的4坐标,中性,近似正方形的平面(1,3-双(2 $ sp prim $ -pyridylimino)isoindolinatoato)Ni(II)(phenylcyanamido)配合物(即(PVP)Ni(pcyd))并具有$ sp1 $ H NMR,电子吸收,红外光谱和X射线冷冻成像的特点。苯基氰酰胺基配体的π-给体能力的增强导致复合物的磁性性质从反磁性到顺磁性的变化。 (PVP)Ni(2-Clpcyd)的晶体结构证明了方平面的四面体畸变,该晶体结构还显示了晶格中有序的分子堆叠。; PVP $ spominus $居中的$ pi $-$ pispddagger $电子跃迁低给体溶剂中的(PVP)Ni(pcyd)配合物显示出“混合”效应,这归因于共轭作用的扩展,这是由于在共同的Ni(II)$ pi $对称轨道内介导的苯氰胺基配体的$ pi $捐赠(PVP)Ni(pycd)配合物存在与温度有关的可逆溶剂配位平衡。非溶剂化和溶剂化的配合物的比例的特征在于表观混合效应的变化,由此推导出热力学参数。

著录项

  • 作者

    Letcher, Robert J.;

  • 作者单位

    Carleton University (Canada).;

  • 授予单位 Carleton University (Canada).;
  • 学科 Analytical chemistry.;Physical chemistry.
  • 学位 M.Sc.
  • 年度 1991
  • 页码 194 p.
  • 总页数 194
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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