Nucleophilic Substitution on Porphyrin Ring： Synthesis of 2-（2-Hydroxynaphthyl）-5,10,15,20-tetraphenylporphyrin

The reactions of 2-nitro-5,10,15,20-tetraphenylporphyrin （1） and its Ni （Ⅱ） （2）, Cu （Ⅱ） （3）, Zn （Ⅱ） （4） complexes with sodium 2-naphthoxide have been investigated in different solvents for preparing 2-substituted porphyrins. 2-（2-Hydroxynaphthyl）-5,10,15,20-tetraphenyl porphyrin （5） and its Ni （Ⅱ） （6）, Cu （Ⅱ） （7）, Zn （Ⅱ） （8） complexes were obtained in 72%, 78%, 81% and 65% yields in 2-naphthol at 150 ℃ respectively. The same products were also obtained in other protic solvents such as diglycol and diglycol monomethyl ether. When the reactions proceeded in aprotic solvent DMF at 150 ℃, besides 5 （70%）, 6 （34%）, 7 （54%） and 8 （50%）, the corresponding 2-（2-naphythoxy）-5, 10,15,20-tetraphenylporphyrin （9）, and its Ni （Ⅱ） （10）, Cu （Ⅱ） （11）, Zn （Ⅱ） （12） complexes were also obtained in minor, 40%, 18% and 2% yields respectively, but only 5, 6, 7, 8 were found at room temperature in DMF or DMSO. These reactions axe much faster than those of 1-4 with sodium phenoxide. The formation of C-coupling products 5-8 was proposed via SRN 1 mechanism.

β-硝基和β-氨基取代卟啉的合成及光谱分析

以5,10,15,20-四苯基卟啉(TPP)为原料,用硝酸铜硝化法合成了β-NO_2-TPP及其铜配合物(β-NO_2-CuTPP),经还原反应制备了β-NH_2-TPP及其铜配合物(β-NH_2-CuTPP)。当n(Cu-TPP)∶n[Cu(NO3)2]=1∶1时,40℃下,β-NO_2-CuTPP的产率为83.2%;当n(SnCl_2)∶n(β-NO_2-TPP)=1∶1时,65℃下,β-NH_2-TPP的产率为68.0%。通过MS、1HNMR、UV-Vis和IR对所合成化合物进行了表征,考察了其紫外和荧光光谱性质。结果表明:与TPP相比,UV-Vis光谱中,β-NO_2-TPP、β-NH_2-TPP、β-NO_2-CuTPP和β-NH_2-CuTPP的Q带吸收峰有4~19nm的红移;荧光光谱中,相对于TPP,β-NH_2-TPP的最大发射峰红移了4 nm,β-NO_2-TPP的两个发射峰则分别红移1 nm和蓝移27 nm,β-NO_2-CuTPP和β-NH_2-CuTPP发生了荧光淬灭;当溶剂从甲苯变为二氯甲烷、氯仿和乙腈时,β-NH_2-TPP的荧光发射波长从656 nm变为655、656和654 nm,相对于溶剂极性的增大,未显示出明显的变化。但β-NH_2-TPP的荧光量子产率则从0.359 7增加到了0.668 1,0.719 0和1.084 7。卟啉化合物产生单线态氧降解1,3-二苯基异苯并呋喃(DPBF)实验结果表明:在25 min时,β-NH_2-TPP和TPP使DPBF的降解率分别达到了27%和23%,说明β-NH_2-TPP产生单线态氧的能力明显优于TPP。