Interpretation of the Electron Paramagnetic Resonance Spectra of Copper(II)–Tyrosine Complex

Interpretation of the Electron Paramagnetic Resonance Spectra of Copper(II)–Tyrosine Complex
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铜(II)-酪氨酸配合物电子顺磁共振谱的解释

DOI:
10.1515/zna-2017-0239
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发表时间:
2017-12
期刊:
Z. Naturforsch.A
影响因子:
--
通讯作者:
匡泯泉
匡泯泉
中科院分区:
其他
文献类型:
--
作者:
徐小慧;匡泯泉

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摘要 基于四阶微扰处理解释了[Cu(l-酪氨酸)2]n (CuA)的电子顺磁共振(EPR)谱,其中包括局域畸变、配体轨道和自旋轨道耦合的贡献。计算出的能带跃迁 dx2−y2${{\text{d}}_{{{\text{x}}^2} - {{\text{y}}^2}}}$ 到 dxy (≈16412 cm−1) 和 dz2${{\text{d}}_{{{\text{z}}^2}}}$ (≈14845 cm−1) 与能带分析结果非常吻合(dx2−y2→dxy${\text{(}}{{\text{d}}_{{{\text{x}}^2} - {{\text{y}}^2}}} \到 {{\text{d}}_{{\text{xy}}}}$≈16410 和 dx2−y2→dz2${{\text{d}}_{{{\text{x}}^2} - {{\text{y}}^2}}} \to {{\text{d}}_{{{\text{z}}^2}}}$≈14850 cm−1) 未解析的分离 dx2−y2→dxz${{\text{d}}_{{{\text{x}}^2} - {{\text{y}}^2}}} \to吸收光谱中的 {{\text{d}}_{{\text{xz}}}}$ 和 dx2−y2→dyz${{\text{d}}_{{{\text{x}}^2} - {{\text{y}}^2}}} \ 到 {{\text{d}}_{{\text{yz}}}}$ 分别评估为 26283 和 26262 cm−1。 CuA,1,3-二氨基丙烷间苯二甲酸铜(II)络合物(CuB)和 N-甲基-1,2-二氨基乙烷-双铜(II)聚合物(CuC)中的铜发色团,转变 dx2−y2→dxy${{\text{d}}_{{{\text{x}}^2} - {{\text{y}}^2}}} \to {{\text{d}}_{{\text{xy}}}}$ (=E1≈10Dq) 随着 R̅L 的减少而增加,R̅L 被评估为铜-配体键长的平均值。得到了CuA、CuB和CuC的g各向同性gav(=(gx+gy+gz)/3)(或共价因子N)并对所有结果进行了讨论。
Abstract The electron paramagnetic resonance (EPR) spectra of [Cu(l-tyrosine)2]n (CuA) were interpreted based on the fourth-order perturbation treatments where the contributions due to the local distortion, ligand orbit and spin-orbit coupling were included. The calculated band transitions dx2−y2${{\text{d}}_{{{\text{x}}^2} - {{\text{y}}^2}}}$ to dxy (≈16412 cm−1) and dz2${{\text{d}}_{{{\text{z}}^2}}}$ (≈14845 cm−1) agree well with the band analysis results (dx2−y2→dxy${\text{(}}{{\text{d}}_{{{\text{x}}^2} - {{\text{y}}^2}}} \to {{\text{d}}_{{\text{xy}}}}$≈16410 and dx2−y2→dz2${{\text{d}}_{{{\text{x}}^2} - {{\text{y}}^2}}} \to {{\text{d}}_{{{\text{z}}^2}}}$≈14850 cm−1). The unresolved separations dx2−y2→dxz${{\text{d}}_{{{\text{x}}^2} - {{\text{y}}^2}}} \to {{\text{d}}_{{\text{xz}}}}$ and dx2−y2→dyz${{\text{d}}_{{{\text{x}}^2} - {{\text{y}}^2}}} \to {{\text{d}}_{{\text{yz}}}}$ in the absorption spectra were evaluated as 26283 and 26262 cm−1, respectively. For CuA, copper chromophores in 1,3-diaminorpropane isophtalate copper(II) complex (CuB) and N-methyl-1,2-diaminoetaane-bis copper(II) polymer (CuC), the transition dx2−y2→dxy${{\text{d}}_{{{\text{x}}^2} - {{\text{y}}^2}}} \to {{\text{d}}_{{\text{xy}}}}$ (=E1≈10Dq) suffered an increase with a decrease in R̅L which was evaluated as the mean value of the copper-ligand bond lengths. The correlations between the tetragonal elongation ratio ρ (=(Rz–R̅L)/R̅L) (or the ratio G=(gz–ge)/((gx+gy)/2–ge)) and the g isotropy gav (=(gx+gy+gz)/3) (or the covalency factor N) for CuA, CuB and CuC were acquired and all the results were discussed.
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