【摘要】 组氨酸铜络合物是构成铜蛋白的重要组份之一。研究组氨酸铜络合物中C_x²⁺ 离子的电子顺磁共振（EPR）波谱对了解铜蛋白所参与的许多重要的生理生化过程是很重要的。本文采用电子顺磁共振技术在4.2K研究了嵌入离子C_x²⁺的盐酸组氨酸晶体。C_u²⁺离子的电子顺磁共振波谱表明,C_x²⁺离子嵌入到L—盐酸组氨酸晶体中的位置与天然的L—组氨酸铜络合物中C_x²⁺离子处于完全不同的化学环境中。嵌入到L—盐酸组氨酸晶体的C_x²⁺离子的基态是一个Kramer双重态。应用实验测定的g张量主值计算了双重态的分子轨道系数,并由此计算得到铜原子的超精细偶合常数Acu。实验结果分析指出、半充满的d轨道是3d_x²型轨道,并在Z轴方向有轴向的轻微压缩。单电子d轨道的次序:3d_x²>3d_x²-y²>3d_yz>3d_xz>3d_xy。C_u²⁺离子嵌入到L—盐酸组氨酸晶体中的位置具有一个畸变的六配位体环境,近似有D₂点群对称性。更多还原

【Abstract】 The L-histidine copper(ll) complex is one of the important components of thecopper-proteins The electron paramagnetic resonance (EPR) Studies of Cu2+located in the L-histidine Cu2+ complexes is-very important for understandingthe processes of physiology and biochemistry related to the copper-proteins. In this article EPR technique has been used to study Cu2+ doped L-histidine single crystals at 4.2K. The EPR spectra of Cu2+ doped in single crystal of L-hisitidine hydrochloride monohydrate indicates that the Cu2+ ion is incorporated in a different environment from that in the ordinary L-histidine Cu2+ complex.The ground state of Cu2+ doped L-histidine single crystal is a kramer’s doublet state. The coefficients of this doublet state were determined from the observed g tenson and in such a way that the hyperfine coupling parameters of Cu2+ ion were calculated from these coefficients and a satisfactory agreement has been obtained between the calculated and the observed values更多还原