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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >Syntheses, crystal structures and electronic properties of a series of copper(II) complexes with 3,5-halogen-substituted Schiff base ligands and their solutions
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Syntheses, crystal structures and electronic properties of a series of copper(II) complexes with 3,5-halogen-substituted Schiff base ligands and their solutions

机译：一系列具有3,5-卤素取代的席夫碱配体的铜（II）配合物的合成，晶体结构和电子性质及其溶液

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摘要

We have systematically investigated the structural features, electronic properties, thermally-induced structural phase transitions and absorption spectra depending on the solvent for ten Cu(II) complexes with 3,5-halogen-substituted Schiff base ligands. Structural characterization of two new complexes, bis(N-R-1-phenylethyl- and N-R,S-2-butyl-5-bromosalicydenaminato-kappa(2)N,O)copper(II), reveals that they afford a compressed tetrahedral trans-[CuN2O2] coordination geometry with trans-N-Cu-N = 159.4(2)degrees and trans-O-Cu-O = 151.7(3)degrees for the 1-phenylethyl complex and trans-N-Cu-N = 157.9(3)degrees and trans-O-Cu-O = 151.0(3)degrees for the 2-butyl one. All the complexes exhibit a structural phase transition by heating in the solid state regardless of their structures at room temperature. The absorption spectra of a series of ten complexes exhibit a slight shift of the d-d band at 1600020 000 cm(-1) and remarkable shift of the pi-pi* band at 24 000-28 000 cm-1, which suggests that the dipole moment of the solvents presumably affects the conformation of the pi-conjugated moieties of the ligands rather than the coordination environment. We have also attempted 'photochromic solute-induced solvatochromism' by a system of bis(N-R-1-phenylethyl-3,5-dichlorosalicydenaminato-kappa(2)N,O)copper(II) and photochromic 4-hydroxyazobenzene in chloroform solution. We successfully observed a change of the d-d and pi-pi* bands of the complex in the absorption spectra caused by cis-trans photoisomerization of 4-hydroxyazobenzene. (c) 2005 Elsevier Ltd. All rights reserved.
机译：我们已经系统地研究了十种具有3,5-卤素取代的席夫碱配体的Cu（II）配合物的溶剂的结构特征，电子性能，热诱导的结构相变和吸收光谱。两种新配合物的结构表征，双（NR-1-苯基乙基-和NR，S-2-丁基-5-溴水杨基腺嘌呤-kappa（2）N，O）铜（II），表明它们提供了压缩的四面体反式- 1-苯基乙基配合物的反式-N-Cu-N = 159.4（2）度和反式-O-Cu-O = 151.7（3）度的[CuN2O2]配位几何，反式-N-Cu-N = 157.9（ 3-度和2-O-Cu-O的反式-O-Cu-O = 151.0（3）度。不管它们在室温下的结构如何，所有配合物都通过在固态下加热而表现出结构相变。一系列十个配合物的吸收光谱在1600020 000 cm（-1）处出现dd谱带的轻微位移，在24 000-28 000 cm-1处pi-pi *谱带出现明显的位移，这表明偶极子溶剂的瞬间可能影响配体的π-共轭部分的构象而不是配位环境。我们还尝试通过双（N-R-1-苯基乙基-3,5-二氯水杨酰胺基氨基-（2）N，O）铜（II）和光致变色4-羟基偶氮苯在氯仿溶液中的系统进行``光致变色溶质诱导的溶剂致变色''。我们成功地观察到了由4-羟基偶氮苯的顺-反光异构化引起的在吸收光谱中配合物的d-d和pi-pi *带的变化。 （c）2005 Elsevier Ltd.保留所有权利。

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