New triazine-based tricarboxylic acid linkers were prepared as elongated relatives of triazinetribenzoic acid (TATB). Additionally, functional groups (NO2, NH2, OMe, OH) were introduced for potential post-synthetic modification (PSM) of MOFs. Functionalized tris(4-bromoaryl)triazine “cores” (3a,3b) were obtained by unsymmetric trimerization mixing one equivalent of an acid chloride (OMe or NO2 substituted) with two equivalents of an unsubstituted nitrile. Triple Suzuki coupling of the cores 3 with suitable phenyl- and biphenylboronic acid derivatives provided elongated tricarboxylic acid linkers as carboxylic acids 17 and 20 or their esters 16 and 19. Reduction of the nitro group and cleavage of the methoxy group gave the respective amino and hydroxy-substituted triazine linkers.
基于新三嗪基
三羧酸连接剂的研究成果作为三嗪三
苯甲酸(TATB)的延伸衍
生物而制备。此外,引入了功能基团(NO
2,NH
2,OMe,OH)以便进行MOFs的潜在后合成修饰(PSM)。通过不对称三聚物化反应,将一个酸
氯化物(OMe或NO
2取代)与两当量未取代的腈混合,得到功能化的三(4-
溴芳基)三嗪“核心”(
3a,
3b)。将核心
3与适当的苯基和
联苯基
硼酸衍
生物进行三次铃木偶联反应,得到延伸的
三羧酸连接剂,即
羧酸17和
20或它们的酯
16和
19。还对硝基基团进行还原并裂解甲氧基团,得到相应的
氨基和羟基取代的三嗪连接剂。