In complexes of Cu2+, Ni2+, Co2+, Zn2+, and Hg2+ with 3,3′,5,5′-tetramethyl-4,4′-dibutyl-2,2′-dipyrrolylmethene, the d-metal ion exerts an auxochromic effect on the π system of the ligand, manifested in a bathochromic shift of the first absorption band in the spectrum of the complex, compared to the free ligand. Polarization of the chromophore π system in the complexes increases in the order Zn2+ < Hg2+ < Co2+ < Ni2+ < Cu2+. The Hg2+ ion in the complex with dipyrrolylmethene participates in mercuration of benzene and chloroform; the reaction with chloroform is faster, with the rates of both reactions strongly depending on temperature.
在Cu2+、Ni2+、Co2+、Zn2+和Hg2+与3,3′,5,5′-四甲基-4,4′-二丁基-2,2′-二
吡咯基甲烯的复合物中,d-
金属离子对
配体的π系统产生助色效应,表现为与游离
配体相比,复合物光谱中第一吸收带的色散移位。复合物中发色团π系统的极化顺序为Zn2+
氯仿的反应速度更快,两种反应的速度都强烈依赖于温度。