Single-crystal electronic spectra of some quadrate chromium(III) complexes

Williams CS; Miller NC; Collins JA

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Single-crystal electronic spectra of some quadrate chromium(III) complexes

机译：某些四方铬（III）配合物的单晶电子光谱

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Polarised electronic spectra of trans-[Cr(tmd)(2)F-2](ClO4), trans- [Cr(en)(2)(dma)(2)](ClO4)(3), trans-[Cr(en)(2)(dmf)Cl](ClO4)(2) and trans[Cr(en)(2)(dmf)Br](ClO4)(2) have been measured at 77 K (tmd = trimethylenediamine; dma = NN-dimethylacetamide; dmf = NN-dimethylformamide; en = ethylenediamine, pn = propylenediamine). The observed quartet bands have been given definitive quadrate assignments based on polarisation characteristics. The four-component quadrate quartet bands have been uncovered and assigned also in the unpolarised crystal spectrum of trans-[Cr(en)(2)(dmf)(2)](ClO4)(3) at 77 K and the solution spectrum of trans-[Cr(en)(pn)F-2](+). The band maxima derived by gaussian analysis in these spectra have been fitted with the theoretical energy equations of d(3) configuration in quadrate ligand fields including full configuration interaction. The ligand field parameters Dq, Dt, and Ds and the election correlation parameter, B, extracted by such a fitting, have been compared with those obtained for other similar systems earlier. The significance of the ligand field symmetry parameters and the translated angular overlap model parameters is discussed. (c) 2007 Elsevier Ltd. All rights reserved.

机译：反式[Cr（tmd）（2）F-2]（ClO4），反式[[Cr（en）（2）（dma）（2）]（ClO4）（3），反式[Cr （en）（2）（dmf）Cl]（ClO4）（2）和反式[Cr（en）（2）（dmf）Br]（ClO4）（2）的测量值为77 K（tmd =三亚甲基二胺; dma ＝ NN-二甲基乙酰胺; dmf ＝ NN-二甲基甲酰胺; en ＝乙二胺，pn ＝丙二胺。根据极化特性，对观察到的四重奏频段进行了确定的四边形分配。已经在77 K的反式[Cr（en）（2）（dmf）（2）]（ClO4）（3）的非极化晶体光谱中发现并分配了四组分四方四方带。反式-[Cr（en）（pn）F-2]（+）。通过高斯分析在这些光谱中得出的带最大值已与包括完全构型相互作用在内的四价配体场中的d（3）构型的理论能量方程拟合。通过这种拟合提取的配体场参数Dq，Dt和Ds以及选举相关参数B已与先前从其他类似系统获得的参数进行了比较。讨论了配体场对称参数和转换后的角度重叠模型参数的重要性。（c）2007 Elsevier Ltd.保留所有权利。

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《Polyhedron: The International Journal for Inorganic and Organometallic Chemistry》 |2008年第2期|共7页
作者
Williams CS; Miller NC; Collins JA;
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正文语种 eng
中图分类化学;
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single-crystal electronic spectra; Chromium(III) complexes; DIPOLAR APROTIC SOLVENTS; LIGAND-FIELD THEORY;

机译：单晶电子光谱;铬（III）配合物;双极性非质子溶剂;配体理论;

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机译：化合物Dichlorotetrakis（mu-pivalato）Dirhenium（III），Tetra-N-Butylammonium Octachlorodirhenate（III），Tetra-N-Butylamiumium Octabromodirhenate（III），Dimolybdenum（II）Tetrapival的单晶偏振电子光谱

Single-crystal electronic spectra of some quadrate chromium(III) complexes

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