摘要
本文用紫外光谱研究Ca(Ⅱ)-BSA和Ni(Ⅱ)-BSA配合物的结构随BSAL浓度的变化,发现当浓度增大并>2×10^(-4)-3×10^(-4)mol·dm^(-3)时,这两种配合物从五配位的四方锥构型转变成四配位的四方平面构型,首次提供了BSA的Asp羧基氧参与同Cu(Ⅱ)和Ni(Ⅱ)配位的证据.计算并讨论了Cu(Ⅱ),Ni(Ⅱ)和有关配体轨道的光学电负性.
The structural change of Cu(Ⅱ)-BSA and Ni(Ⅱ)-BSA complexes with BSA concentration has been investigated by means of UV spectrophotometry. We have found that the configuration of these complexes transforms from a pentacoordinated square-pyramid into a tetracoordinated square-planar as the BSA concentration increases over 2×10^(-4)—3×10^(-4)mol·dm^(-3). This finding confirmed the involvement of the Asp carboxyl oxygen in the coordination of Cu (Ⅱ) and Ni (Ⅱ) in the case of BSA for the first time. The optical electronegativities of Cu(Ⅱ), Ni(Ⅱ), and relevant ligand orbitala also have been calculated and discussed.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1991年第1期59-64,共6页
Acta Chimica Sinica
