摘要
自Padersen首次报道了冠醚及其金属配合物以来,冠醚对金属离子特殊的配位性质引起人们极大的重视。近廿年来,有关这类化合物的研究发展很快。二苯并-18-冠-6(DB18C6)作为最早合成出的冠醚,它与金属离子的配位作用已被广泛研究。Cassol等曾合成出硝酸稀土与DB18C6的配合物,但对硝酸铈(Ⅲ)与DB18C6固体配合物的性质。
The single crystal of the complex cerium (Ⅲ) nitrate with dibenzo-18-crown-6
(DB18C6) has been prepared and characterized by elemental analyses, infrared spectra,
molar conductance, differential thermal analyses (DTA) and thermogravimetry (TG).
The structure of this complex is determined by X-ray single crystal diffraction analyses.
The crystal of the complex, Ce(NO_3)_3·C_(20)H_(24)O_6, is tetragonal, space group P4_12_12 with
cell paraters: a=b=8. 649 (3), c=33.388 (21)A, V=2497.6A^3, Z=4, D_c=1.83 g/cm^3,
D_o=1.82 g/em^3. The cerium ion lies more or less at the centre of the ring consisted of six
oxygen atoms of the crown. The three nitrate group in the complex are bidentate and
two of them are coordinated on the less hindered side while the other is bonded on the
opposite side. The coordination number of Ce(Ⅲ) ion is 12. The average bond lengths
are 2.648A for the six Ce--O(crown) bonds and 2.664A for the six Ce--O(NO_3^-) bonds
respectively.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1989年第2期167-170,共4页
Acta Chimica Sinica
