氮杂冠醚取代基对schiff碱锰(Ⅲ)配合物催化苯乙烯环氧化反应的影响

Effect of aza-crown substituent on the catalytic epoxidation performance of schiff Base Mn(Ⅲ)complex

合成并表征了苯并-10-氮杂-15-冠-5或吗啉基取代的单和双Sch iff碱锰(Ⅲ)配合物MnL21C l,MnL22C l,Mn l3C l和MnL4C l.研究了它们作为仿P450模型化合物催化苯乙烯环氧化反应的性能,并考察了催化反应的动力学.结果表明,氮杂冠醚取代的Sch ifft碱锰(Ⅲ)配合物优于相应的吗啉基取代的Sch iff碱锰(Ⅲ)配合物,且反应遵从M ichaelis-M enten规律.这是由于具有特殊功能和空间构型的氮杂冠醚大环的引入。改善了催化中心周围的微环境,从而显著地提高了Sch iff碱锰(Ⅲ)配合物的催化活性.

The benzo - 10 - aza - 15 - crown - 5 （ BN15C5 ） substituted mono. Schiff base HL1 and bis Schiff base HL2 were synthesized by condensation of amine with N - （3 -formyl -4 - hydroxybenzyl）benzo - 10 - aza - 15 - crown -5 and characterized by IR, MS, ^1H NMR and elemental analysis. Their Mn（Ⅲ）complexes MnL2^1Cl and MnL^2Cl were employed asmonooxygenase model to eatalyse the epoxidation of styrene,and the kinetics of the catalytic reaction were also investigated in comparison with morpholino substituted analogues MnL2^3Cl and MnL^4Cl. The effect of the azn-crown substituent on the catalytic epoxidation performance was also discussed.