- 作者: 李宗仁; 盧天惠; 梁碧峰; 鍾崇燊; 李曾遹
- 作者服務機構: National Tsing Hua University, Hsinchu, Taiwan 300
- 中文摘要: The structure of macrocyclic ligand complex, (5,7,12,14-tetraethyl-7,14-dimethyl-1,4,8,11-tetraazacyclotetra decane)‧NI…‧(ClO4)2 has been determined by X-ray diffraction with three dimensional counter data. This compound, C20H44N4Ni…‧(ClO4)2, crystallizes in orthorhombic space group Pbca, with cell parameters a=14.369, b=11.752, c=16.207 A, V=2736.8A3, determined from Syntex Pl autodiffractomer. The formula weight (598.21) and a measured density of 1.45 gm cm¯2 (by flotation) indicate the presence of four molecules per unit cell (D…=1.452gm cm¯2). The structure was solved, using Patterson and Fourier methods and refined by full-matrix least-squares techniques to a reliability index, R(F) of 0.09, based on 1480 independent observed data corrected for absorption, L-p factors. In this molecule, in addition to the usual covalent and ionic bonds, there exist two hydrogen bonds between the perchlorate ions and the amine groups. The Ni and the four N atoms are coplanar. The six membered ring subtends a larger angle (93.5(3)°) over the Ni atom than the five membered ring (86.5(3)°) does. The former belongs to the chair form and the latter pertains to the gauche form.
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