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将醋酸铜、L-谷氨酸和无水醋酸钠按1∶2∶4摩尔比经室温固相反应,合成了一种新的配合物[Cu(C5H7NO2)·H2O]·H2O。通过元素分析、红外光谱、差热-热重及X射线单晶衍射测试技术对其结构进行了表征。差热-热重分析显示,该配合物含有1分子结晶水和1分子配位水。晶体结构解析表明,晶体属正交晶系,P2(1)2(1)2(1)空间群,晶胞参数为:a=0.7244(2)nm,b=1.0330(3)nm,c=1.1075(3)nm,Z=4,V=0.8288(4)nm3,Dc=1.961g/cm3,μ=2.635mm-1,F(000)=500,R1=0.0307,wR2=0.0696,GOF=1.012。该化合物由L-谷氨酸中C1羧基上氧原子、氨基氮原子、C5羧基上氧原子及1个水分子中氧原子与中心Cu(Ⅱ)离子配位,形成五配位的畸变四方锥构型。四方锥之间通过羧基氧原子与结晶水或配位水形成分子间氢键,这种氢键及弱相互作用相互连接构成了L-谷氨基酸铜配合物的三维网状超分子体系。旋光活性测定表明,配合物为左旋体,比旋光度为[α]1D5=-38.5°(水),其旋光方向与配体相反,这是由于氨基氮及羧基氧参与配位形成五元环,改变了手性碳原子周围环境,从而使旋光方向改变。
A new complex [Cu (C5H7NO2) · H2O] · H2O was synthesized by solid state reaction of copper acetate, L-glutamic acid and anhydrous sodium acetate at a 1: 2: 4 molar ratio at room temperature. Its structure was characterized by elemental analysis, FTIR, DTA-TG and single crystal X-ray diffraction. Differential thermal analysis shows that the complex contains 1 molecule of crystal water and 1 molecule of coordination water. The crystal structure analysis shows that the crystal belongs to the orthorhombic space group with the lattice parameter of a = 0.7244 (2) nm and b = 1.0330 (3) nm, c = 1.1075 (3) nm Z = 4 V = 0.8288 (4) nm3 Dc = 1.961 g / cm3 μ = 2.635 mm-1 F000 = 500 R1 = 0.0307 wR2 = 0.0696 GOF = 1.012 . The compound is composed of an oxygen atom, an amino nitrogen atom, an oxygen atom on C5 carboxyl group and an oxygen atom in a water molecule of C1 carboxyl group in L-glutamic acid coordinate with central Cu (II) ion to form a five-coordinate distorted tetragon structure. The tetragonal pyramids form intermolecular hydrogen bonds through the carboxyl oxygen atoms with the crystal water or the coordination water, and the hydrogen bonds and the weak interactions are mutually connected to form a three-dimensional network super-molecular system of the L-glutamic acid copper complex. The measurement of optical activity showed that the complex was L-form and the specific rotation was [α] 1D5 = -38.5 ° (water). The optical rotation was opposite to that of the ligand due to the coordination of amino nitrogen and carboxyl oxygen to form a five-membered ring , Change the environment around the chiral carbon atoms, so that the optical rotation direction change.