Oligopeptide-linked zinc-porphyrins were prepared (oligopeptide = –Phem–Alan–OMe and porphyrin = 5,15-diaryl-2,3,7,8,12,13,17,18-octaethylporphyrin). 1H NMR, IR, visible, and CD spectra of the synthetic molecule in a chlorinated methane (CDCl3 or CH2Cl2) showed that the carbonyl oxygen of the N-terminal amino acid of the linked peptide should ligate the central zinc metal in the molecule as the axial ligand to form a pentacoordinated zinc-porphyrin. The coordination of the zinc with the peptide framework changed the optical and electrical properties, indicating that such ligation might control the reactivity in biological metallotetrapyrrole–protein systems as well as the coordination to the peptide residue.
通过寡肽连接的
锌卟啉被制备出来(寡肽=–Phem–Alan–OMe,
卟啉=5,15-二芳基-2,3,7,8,12,13,17,18-八乙基
卟啉)。合成分子在
氯化
甲烷(CDCl3或
CH2Cl2)中的1H NMR、IR、可见光和CD光谱显示,连接肽的N-末端
氨基酸的羰基氧应该作为轴向
配体配位到分子中的中心
锌金属,形成五配位的
锌卟啉。
锌与肽骨架的配位改变了光学和电学性质,表明这种配位可能在
生物金属四
吡咯蛋白系统以及肽残基的配位中控制反应性。