1‐(3‐pyridine)butane‐1 ,3‐diketones as the ligand ,the coordination reaction of the β‐diketones(L) with Cu(Ⅱ) ,Ni(Ⅱ ) ,Cr (Ⅱ ) is investigated via UV‐Vis spectroscopy at room temperature . The equilibrium constants and ligand ratio are determined . T he results show that ultraviolet absorption curve ofβ‐diketones(L) with Cu(Ⅱ ) ,Ni (Ⅱ ) and Cr (Ⅱ ) in ethanol solution occurs redshift . The coordination ratio of β‐diketones with three metalions are all 1∶1 . The complexes of equilibrium constant of three complexes are 4.2 × 108 ,3.4 × 108 ,and 0.2 × 106 L・mol-1 ,respectively .%以1‐（3‐吡啶基）丁烷‐1，3‐二酮即β‐二酮为配体，在室温下将其与金属Cu（Ⅱ），Ni（Ⅱ），Cr（Ⅱ）在乙醇溶液中进行配位反应，采用U V‐Vis光谱方法，测定了β‐二酮（L ）与这三种金属离子的配位比和平衡常数．结果表明，在β‐二酮（L）的乙醇溶液中分别加入三种金属离子后，紫外吸收曲线发生红移，β‐二酮（L）与Cu（Ⅱ），Ni（Ⅱ）和Cr（Ⅱ）的配位比均为1∶1，配合物的平衡常数分别为4.2×108，3.4×108和0.2×106 L・mol－1．
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