摘要
本文研究了La,Pr,Nd,Sm,Gd,Tb,Dy,Ho,Er,Tm,Yb,Lu,Y十三种稀土丙酸盐的FT-IR光谱,对1800—100cm的主要红外吸收谱带进行了归属,指认316—349cm的强吸收带为Ln—O键的伸缩振动带v.稀土丙酸盐红外光谱表明存在两种不同的羧基配位形式.从La到Tm以及Y等十一种丙酸配合物的配位羧基具有对称的螯合双齿形式,而对重稀土Yb和Lu,与中心离子配位的三个羧基中,至少有一个羧基具有螯合桥式三齿配位形式.结果还表明稀土丙酸盐Ln—O键基本上是离子键.
FT-IR spectra of the propionates of La,Pr,Nd,Sm Gd,Tb,Dy,Ho,Er,Tm,Yb,Lu and Y have been studied.The principal infrared absorption bands have been assigned for the region 1800-100cm.The strong absorption bands near 316-349 cmwere believed to be Ln-O stretching bands.Mid-IR spectra of rare earth propionates can be divided into two types,indicating that there are two different carboxylate coordinate forms.For 11 of the 13 rare earth propionates(except Yb,Lu),the carboxylate coordination had the chelating bidentate form,whereas at least,one of the three carboxylate groups had the form of chelation-bridging tridentate for ytterbium and lutetium propionates,i.e.one of the carboxyl oxygens was shared between two adjacent metal ions.The experimental result showed that Ln-O bond of rare earth propionate is principally ionic.
出处
《化学学报》
SCIE
CAS
1988年第1期9-13,共5页
Acta Chimica Sinica
基金
中国科学院科学基金资助的课题
