一对单核铜-酪氨酸手性配合物的合成、晶体结构及磁性性质

摘要

在水溶液中合成了一对单核铜-酪氨酸手性配合物[Cu(L-Tyr)2](1)和[Cu(D-Tyr)2](2) [Tyr = 酪氨酸],并通过元素分析、红外光谱和X射线单晶衍射以及圆二色光谱对其结构进行了表征.结构分析表明1和2是由单位[Cu(L-Tyr)2]或者[Cu(D-Tyr)2]通过Cu-O键连接而成的一维链状结构.从超分子化学的角度来看,邻近的单位[Cu(L-Tyr)2]或者[Cu(D-Tyr)2]之间通过弱的氢键相互作用而连接成三维超分子结构.1和2的变温磁化率的研究表明1和2表现出铁磁性行为.而且场依存磁化测量表明1和2处于S = 1/2基态.%A couple of chiral mononuclear copper(Ⅱ)-tyrosine complexes [Cu(L-Tyr)2] (1) and [Cu(D-Tyr)2] (2) [Tyr = tyrosine] have been successfully synthesized in the aqueous solution and further characterized by elemental analyses, IR spectra, single-crystal X-ray diffraction and circular dichroism (CD) spectroscopy. Structural analysis indicates that 1 and 2 exhibit the interesting 1-D chainlike arrangement architected from the[Cu(L-Tyr)2] or[Cu(D-Tyr)2] units connected by Cu-O linkages. From the view of supramolecular chemistry, neighboring [Cu(L-Tyr)2] or [Cu(D-Tyr)2] units are interlinked through weak hydrogen-bonding interactions constructing the 3-D supramolecular structure. Variable-temperature magnetic susceptibilities of 1 and 2 were investigated,indicating that 1 and 2 exhibit the dominant ferromagnetic behavior. Moreover, the field-dependent magnetization mea-surements suggest that 1 and 2 possess an S = 1/2 ground state.