Regularities of the formation of binuclear homo- and heteroleptic complexes of d metals with 3,3′-bis(dipyrrolylmethenes) in DMF
作者:N. A. Dudina、E. V. Antina、G. B. Guseva
DOI:10.1134/s1070328411040026
日期:2011.5
spectrally revealed in solutions containing a ligand excess (c H 2 L / c M(AcO) 2 > 1). An increase in the salt concentration shifted the system of equilibria to the homoligand product [M2L2]. The thermodynamic constants of the reactions increased in the series of complexing agents: Cu(II) < Cd(II) < Hg(II) < Ni(II) < Co(II) < Zn(II). An analysis of the data on the thermodynamic constants of [M2L2] helicate
通过分光光度法研究了七个对称的烷基化四齿配体3,3'-双(二吡咯基亚甲基)(H 2 L)与d-金属乙酸盐(M(AcO)2)在DMF溶液中在298.15 K下的反应。发现Helicands H2L在结构上经过预组织,可以与Co(II),Ni(II),Cu(II),Zn(II),Cd(II)和Cd(II)形成稳定的双核均二螺旋[M 2 L 2 ]。乙酸汞(II)。金属离子对配体的配位包括形成杂配[M 2 L(AcO)2 ]和纯配[M 2 L 2 ]络合物的连续步骤。[M 2 L(AcO)2在含有过量配体(c H 2 L / c M(AcO) 2 > 1)的溶液中光谱揭示了]配合物。盐浓度的增加将平衡系统转移至高配体产物[M 2 L 2 ]。反应的热力学常数在一系列络合剂中增加:Cu(II)