【摘要】 合成了三种标题化合物LnC₈H₁₆N₃O₁₃（In=Pr,Nd,Sm）。并用单晶X射线衍射法测定了它们的晶体与分子结构。它们均属单斜晶系,空间群为P2₁/c,Z=4。晶胞参数为:a=12.160（4）[12.153（4）,12.122（4）]。b=8.549（3）[8.562（2）,8.550（4）],c=15.435（2）[15.376（3）,15.293（6）]A,β=92.55（2）[92.22（2）,91.77（3）)°,结构用Patterson函数法与Fourier迭代法解出,并用最小二乘法修正,最后的R值为0.032[0.067,0.068]。Ln³⁺离子跟三个双齿配位体的硝酸根及冠醚环上的四个氧原子键合,形成十配位的化合物。Ln-O的距离在2.49～2.62[2.47～2.62,2.44～2.58]A范围之内,平均值为2.54[2.53,2.51]A。更多还原

【Abstract】 The crystal structures of the title compounds were determined by single crystal X-ray diffraction. The complexes all crystallize in the monoclinic space group P2₁/c, with Z=4. Lattice parameters are, a=12.160（4）[12.153（4）, 12.122（4）],b=8.549（3）[8.562 （2）, 8.550（4）], c=15.425（2）[l5.376（3）, 15.293) 6)], β=92.55（2）[92.22（2）, 91.77 （3）]°. The structures were solved by Patterson and Fourier techniques and refined by leastsquares to R=0.032 [0.067, 0.0673. The Ln （Ⅲ） ions （Ln=Pr, Nb, Sm） are 10-coordinated, being bonded to three bidentate nitrate groups and to the four oxygen atoms of the crown ether. The Ln-O distances are in the range 2.49-2.62[2.47-2.62,2.44-2.58]（average:2.54[2.53, 2.51]）.更多还原