THE CRYSTAL-STRUCTURE OF NEODYMIUM AND EUROPIUM CHROMATE HEPTAHYDRATE - SYNTHESIS, INFRARED-SPECTRA, AND THERMAL-BEHAVIOR OF LANTHANOID CHROMATE HEPTAHYDRATES, [LN2(CRO4)3(H2O)5].2H2O (LN = LA, PR, ND, SM, EU, GD)

被引:9
作者
LEPPAAHO, J
VALKONEN, J
机构
[1] University of Jyväskylä, Department of Chemistry
关键词
D O I
10.1016/0022-4596(91)90250-L
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The crystal structures of Nd2(CrO4)3 · 7H2O and Eu2(CrO4)3 · 7H2O were determined by the conventional single-crystal X-ray diffraction technique. In addition, unit cell dimensions were measured for La2 (CrO4)3 · 7H2O and Sm2(CrO4)3 · 7H2O. All these compounds are isostructural. Crystals are monoclinic, space group P21 c. For Nd2(CrO4)3 · 7H2O, a = 8.052(4) Å, b = 19.143(4) Å, c = 13.326(6) Å, β = 128.15(4)°, Z = 4, Dx = 3.14 Mg · m-3, T = 296(1); and for Eu2(CrO4)3 · 7H2O, a = 7.965(3) Å, b = 18.985(4) Å, c = 13.185(4) Å, β = 128.00(2)°, Z = 4, Dx = 3.29 Mg · m-3, T = 296(1). Ln atoms are nine-coordinated so that the coordination polyhedron is a tricapped trigonal prism for Ln1 and a monocapped square antiprism for Ln2. Structures form a three-dimensional network. Unit cell dimensions for La2(CrO4)3 · 7H2O are a = 8.181(6) Å, b = 19.294(6) Å, c = 13.436(8) Å, β = 128.09(6)° and those for Sm2(CrO4)3 · 7H2O are a = 7.975(9) Å, b = 19.00(1) Å, c = 13.18(3) Å and β = 127.5(2)°. Thermal behavior was investigated and IR spectra were recorded for Ln2(CrO4)3 · 7H2O (Ln = La, Pr, Nd, Sm, Eu, Gd). © 1991.
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页码:136 / 147
页数:12
相关论文
共 16 条
[1]  
AARNIO P, 1981, FINN CHEM LETT, V7, P97
[2]  
BASHILOVA NI, 1976, ZH NEORG KHIM+, V21, P1589
[3]  
BASHILOVA NI, 1971, ZH NEORG KHIM+, V16, P1368
[4]  
BASHILOVA NI, 1978, ZH NEORG KHIM+, V23, P1066
[5]   SYNTHESIS, CRYSTAL-GROWTH, AND STRUCTURE OF LA(OH)CRO4 [J].
BUENO, I ;
PARADA, C ;
PUEBLA, EG ;
MONGE, A ;
VALERO, CR .
JOURNAL OF SOLID STATE CHEMISTRY, 1989, 78 (01) :78-83
[6]  
BUENO I, 1988, J CHEM SOC DA, V7, P1911
[7]  
Cotton FA., 1988, ADV INORG CHEM, V5
[8]  
Frenz B.A, 1978, COMPUTING CRYSTALLOG, P64
[9]  
JOHNSON CK, ORNL5138 REP
[10]  
LEPPAAHO J, IN PRESS