The interaction of metallo derivatives of tetraphenylchlorin (TPC) and octaethylporphyrin (OEP) with 2,4,7-trinitrofluorenone (TNF) is described in terms of 1 : 1 molecular complexes. The binding constants vary as CuOEP>ZnOEP>CuTPC>ZnTPC and this variation is accounted in terms of the structure of the macrocycle and the substituents presen on it. ESR studies of the complexes reveal that the π-complexation results in changes in the electronic structure of the central metal ion. The magnitude of different proton shifts of the acceptor in 1H NMR spectra of the complexes are used to arrive at the possible solution structure of the complexes.
四苯基二
氯林(TPC)和八乙基
卟啉(OEP)的
金属衍
生物与
2,4,7-三硝基芴酮(TNF)的相互作用以1:1分子复合物的形式描述。结合常数变化为 CuOEP>ZnOEP>CuTPC>ZnTPC,并且这种变化是根据大环的结构及其上存在的取代基来解释的。配合物的 ESR 研究表明,π 配合导致中心
金属离子的电子结构发生变化。配合物 1H NMR 谱中受体不同质子位移的大小用于得出配合物可能的溶液结构。