金属卟啉及其与咪唑络合物的电喷雾质谱研究

Investigation of Metalloporphyrins and Their Imidazole Complexes Using Electrospray Ionization Mass Spectrometry

利用电喷雾电离质谱 (ESI MS)研究了 3种金属卟啉化合物 (MTPP =MnTPP ,FeTPP和CoTPP) ,探讨了在这些化合物中苯取代基与卟啉环间的键合能力以及金属卟啉与咪唑的配位情况。研究结果表明 ,金属卟啉的外围取代基苯基与卟啉环的键合能力按Mn、Fe和Co的次序变弱。金属卟啉与咪唑形成的络合物的离子丰度随配体浓度的增加而增强 ;在相同的配体浓度下 ,络合物的离子丰度按Mn、Fe和Co顺序依次增加 ,其中 ,CoTPP络合物的稳定性最强。

Three compounds of metalloporphyrins were studied using electrospray ionization mass spectrometry. The bonding power between substitutional phenyl and porphyrin cycle and the coordinate conditions of metalloporphyrins with imidazole were discussed. The experimental result indicated that the bonding power between substitutional phenyl and porphyrin cycle in metalloporphyrins became weak from Mn, Fe to Co. The complexes abundances formed by metallophorphyrin with imidazole were stronger with the increase of the ligand concentration. At the same ligand concentration, the abundance of the complexes was intensified gradually and the stability of the ligands was become stronger from Mn, Fe to Co.