超支化分子桥联受阻酚抗氧化剂的合成与表征

以正十八胺为核的1.0代超支化大分子和β-(3,5-二叔丁基-4-羟基苯基)丙酰氯为原料,通过酰胺化缩合反应,合成了一种具有长链烷基和2个受阻酚基团的新型超支化分子桥联受阻酚类抗氧化剂.通过正交实验确定了超支化分子桥联受阻酚类抗氧化剂的最佳合成体系为:3,5-丙酰氯为酰化剂、K_2CO_3为缚酸剂、苯和水为反应溶剂.通过条件优化实验确定了超支化分子桥联受阻酚类抗氧化剂的最佳合成条件为:3,5-丙酰氯与1.0代超支化大分子的物质的量比为6∶1、反应温度为25 ℃、反应时间为12 h、体系苯与水体积比为6∶1、3,5-丙酰氯与缚酸剂K_2CO_3的物质的量比为1∶1,在此条件下,超支化分子桥联受阻酚类抗氧化剂的收率高达75.5%.FT-IR和1H NMR证实了合成抗氧化剂的化学结构与其理论结构相符.超支化分子桥联受阻酚类抗氧化剂在聚乙烯树脂中的抗氧化性能优于抗氧化剂1076,且随着烷基链长度的增加,抗氧化性能增强.     

Synthesis,Structure, and Properties of {[Mn(ADA)(Phen)]·(H_2O)_2}_n Constructed from Azobenzene-4,4?-dicarboxylic Acid and 1,10-Phenanthroline

One coordination polymer(CP) {[Mn(ADA)(Phen)](H_2O)_2}_n(1, H_2ADA = azobenzene-4,4?-dicarboxylic acid, Phen = 1,10-phenanthroline), has been synthesized via hydrothermal reactions. CP 1 was characterized by elemental analyses, IR spectra, thermal behaviors, and X-ray single-crystal diffraction. In CP 1, each ADA~(2-) ligand bridges two Mn~(2+) to give one-dimensional zigzag chains with the Mn···Mn separations of 17.6911 and 16.3976 ?, which generates a three-dimensional supramolecular structure by means of strong π···π interaction and hydrogen bonding. It crystallizes in triclinic, space group P1, with a = 7.6200(13), b = 9.1530(15), c = 18.262(2) ?, α = 88.467(3)o, β = 84.145(2)o, γ = 77.542(2)o, V = 1237.2(3) ?~3, Z = 2, C_(26)H_(20)MnN_4O_6, Mr = 539.40, Dc = 1.448 g/cm~3, F(000) = 554, S = 1.018, R = 0.0531 and w R = 0.1094. In addition, natural bond orbital analysis was performed by the B3 LYP/LANL2 DZ method of Gaussian 09 Program. The fluorescence, magnetic, and electrochemical properties of 1 have been investigated.