摘要
用x光衍射方法测定了标题化合物的晶体和分子结构,衍射强度的收集和晶胞参数的确定在 ERNAF-NONIUS CAD-4 四圆衍射仪上完成。结果表明,Nd^(3+)的与位数为10,且在配合物中作为配体的NO_?虽仍保持其平面型,但键长与键角均发生了变化。
[Nd(H2O)4(NO3)3]·2H2O, Mr. =438. 35, triclinic, space group F 1, a=0. 676 8(5),b=0.919 5(6), c=1. 172 6(7)nm, α=69. 79(5),β=88. 93(5),γ=69. 33(5)°,Z= 2,V=0. 636 1 nm3 ,Da=2. 288 g/cm3,P(000)=426. 9. Structure analysis showed that the Nd atom has bicapped distored square antiprismatic coordination of oxygen atoms from four water molecules and three NO3 groups. The Nd-O(nitrato) and Nd-O(aqua) distances are in the ranges 0. 254 2-0. 271 3 nm and 0. 244 4-0. 246 2 nm respectively. The N-O bond lengths vary between 0. 120 8-0. 126 7 run, the shortest lengths involve the noncoordinated oxygens. All three nitrato groups are bidentately bound to the central atom. The two lattice water molecules are outside the coordination sphere of the Nd atom but participates in the network of intermolecular hydrogen bond.
出处
《厦门大学学报（自然科学版）》
CAS
CSCD
北大核心
1991年第1期55-58,共4页
Journal of Xiamen University：Natural Science
关键词
稀土
络合物
分子结构
ND
晶体结构
Bidentated coordination, Bicapped distored square antiprism
