摘要
制备了11种低水合物RE(NCS)_3·mH_2O(RE=La,Ce,Pr,Nd时,m=4.5;RE=Sm,Eu,Gd,Dy,HO,Yb,Y时,m=3)。测得了它们的熔点,并对其X射线物相分析进行了研究。采用量热法,测定了除Y以外的10种低水合物的标准生成焓,求得了它们的晶格能,以及从高水合物至相应的低水合物的标准脱水焓。还对Tb,Er,Tm,Lu 4种RE(NCS)_3·mH_2O(m=3)的相应数据进行了估算。
The lower hydrates RE(NCS) 3.mH2O(when RE = La, Ce, Pr, Nd, m = 4.5; when RE = Sm, Eu, Gd, Dy, Ho, Yb, Y, m = 3) were prepared by means of dehydration of corresponding higher hydrates RE(NCS) 3.nH2O (when RE = La, Ce, Pr, Nd, n = 7;when RE = Sm, Eu ..Gd, Dy, Ho, Yb, Y, n = 6). The melting points of RE(NCS) 3.mH2O and RE(NCS) 3.nH2O were determined by means of capillary tubes.Both integral heats of solution of RE(NCS) 3.mH2O and RE(NCS) 3.nH2O (except Y) in water were measured calorimetically at 298.15K. The standard enthalpies of formation of ten lower hydrates RE(NCS) 3.mH2O were obtained. The standard dehydration enthalpies △Hn→m°of higher hydrates RE(NCS) 3.nH2O to corresponding lower hydrates RE(NCS) 3.mH2O and lattice energies of RE(NCS)3.mH2O were also calculated. The corresponding data of RE(NCS)3. mH2O (RE = Tb, Er, Tm, Lu) were estimated.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1989年第4期329-334,共6页
Chemical Journal of Chinese Universities
基金
中国科学院科学基金
关键词
稀土
异硫氰酸盐
低水合物
生成焓
Rare earth, Isothiocyanate, Lower hydrate, Standard enthalpies of formation
