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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Molecular and electronic structure of chromium(V) nitrido complexes with azide and isothiocyanate ligands
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Molecular and electronic structure of chromium(V) nitrido complexes with azide and isothiocyanate ligands

机译:叠氮化物和异硫氰酸酯配体的铬(V)亚硝基络合物的分子和电子结构

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摘要

The first use of [Cr(N)Cl-4](2-) as a starting material in chromium(V) nitrido chemistry is demonstrated in simple, high yield, metathesis reactions with the pseudohalogens SCN- and N-3(-) yielding five-coordinate, labile complexes: [Cr(N)(NCS)(4)](2-) and [Cr(N)(N-3)(4)](2-), which have been crystallized and characterized by single-crystal X-ray diffraction. Reaction of [Cr(N)(NCS)(4)](2-) with 1,10-phenanthroline furnishes six-coordinate [Cr(N)(NCS)(3)(phen)](-), wherein phenanthroline coordinates to the position trans to the nitrido ligand. The trans influence of the nitrido ligand leads to a bond length difference of 0.223 angstrom between the axial and equatorial ligators from the phenanthroline ligand. The absorption band with lowest energy in these pseudo-linear complexes is assigned as the electric dipole forbidden transition d(xy)-> d(x-y) based on intensities and its variation with the nature of the equatorial ligators. This absorption provides the spectrochemical series for the equatorial ligands, which is found to be numerically almost identical to that determined for chromium(III). DFT calculations reproduce the observed structures and corroborate the ligand field picture of the electronic structure of these complexes.
机译:在与假卤素SCN-和N-3(-)的简单,高收率复分解反应中证明了[Cr(N)Cl-4](2-)在铬(V)氮化化学中作为原料的首次使用。产生五坐标不稳定的络合物:[Cr(N)(NCS)(4)](2-)和[Cr(N)(N-3)(4)](2-),已被结晶和表征通过单晶X射线衍射。 [Cr(N)(NCS)(4)](2-)与1,10-菲咯啉的反应提供了六坐标的[Cr(N)(NCS)(3)(phen)](-),其中菲咯啉的坐标转移至亚硝基配体的位置。亚硝基配体的反式影响导致菲咯啉配体的轴向和赤道连接子之间的键长差为0.223埃。根据强度及其随赤道结扎子性质的变化,将这些伪线性络合物中具有最低能量的吸收带分配为电偶极禁止跃迁d(xy)-> d(x-y)。这种吸收为赤道配体提供了光谱化学系列,发现其在数值上与对铬(III)的测定几乎相同。 DFT计算重现了观察到的结构,并证实了这些配合物的电子结构的配体场图。

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