Copper(II) Complexes of Cyclams Containing Nitrophenyl Substituents: Push–Pull Behavior and Scorpionate Coordination of the Nitro Group
作者:Massimo Boiocchi、Carlo Ciarrocchi、Luigi Fabbrizzi、Maurizio Licchelli、Carlo Mangano、Antonio Poggi、Miguel Vázquez López
DOI:10.1021/acs.inorgchem.5b01273
日期:2015.11.2
detail for the [CuII(4)]2+ system. In particular, the conversion is spectacularly accelerated by catalytic amounts of Cl–, NCO–, and F–. While for Cl– and NCO– the effect can be associated with the capability of the anion to stabilize through coordination a possible dissociative intermediate, the amazingly powerful effect of F– must be related to the preliminary deprotonation of one N–H fragment of the
三种硝基苯基-环酰胺衍生物(nitrocyclams):1-(4-硝基苯基)-1,4,8,11-四氮杂十四烷(2),1-(2-硝基苯基)-1,4,8,11-四氮杂十四烷(3)和1-(2,4-二硝基苯基)-1,4,8,11-四氮杂环十四烷(4),在MeCN溶液中,根据不可逆的过程具体结合Cu II离子,该过程以黄色消失的黄色信号表示的浓度ç <1×10 -4 M和由黄色到红色的颜色变化为c ^ ≥1×10 -3,并且必须考虑铜的有效和特异的剂量计(II)盐。当存在于硝基苯基取代基的邻位时,-NO 2基团根据蝎子模式协调Cu II,而金属环素系统表现出反式I构型。在MeCN溶液中,红色的反式I- [Cu II(3)] 2+和反式的I- [Cu II(4)] 2+的蝎状配合物缓慢地转变为紫色的反式III的蝎状配合物。所述的动力学方面反-I -到-反式III构重排在详细研究了[铜II(4)] 2+