合成了若干新的多氟氮超酸的镧系金属盐，并用ＩＲ，１９ＦＮＭＲ和元素分析等对它们的结构进行了鉴定．利用这些金属盐与２，４，４，６－三甲氧基偶氮苯的加酸显色以及催化苯甲醚的Ｆｒｉｅｄｅｌ－Ｃｒａｆｔｓ酰化反应等方法，对不同金属盐的Ｌｅｗｉｓ酸性进行了研究，结果表明，大体积、弱配位的有机阴离子的引入对促进金属阳离子Ｌｅｗｉｓ酸性的提高起着十分重要的作用 A number of new lanthanide metal salts were synthesized and their structures were identified by IR, 19F NMR and elemental analysis. The Lewis acidity of different metal salts has been studied by means of acid addition of these metal salts with 2,4,4, 6-trimethoxyazobenzene and the Friedel-Crafts acylation of anisole . The results show that the introduction of bulky and weakly coordinated organic anions plays a very important role in promoting the Lewis acidity of metal cations