Crystal structure and anion-dependent variations in the vibrational spectra of 4,4′-bipyridinium cations
作者:D.J. Barker、J.S. Buckleton、G.R. Clark、R.P. Cooney、C.E.F. Rickard
DOI:10.1016/0022-2860(90)80218-9
日期:1990.10
R =0.041, R w =0.042 for 847 ( I >2.5σ) reflections. The dihedral angle between the two planar rings of the cation is 39.0°. The Raman and IR spectra of the dinitrate salt confirm the existence of relatively strong hydrogen bonding (N + ··O − distance, 2.674 A) and reflect the lower cation symmetry ( D 2 ) associated with non-coplanar rings.
摘要 4,4'-联吡啶硝酸盐的晶体结构已经确定。晶体数据:C 10 H 10 N 4 O 6 , M r =282.18, a =23.334 (3), b =27.653 (6), c =3.6687 (5) A, V =2367.2 A 3 ,正交,空间群Fdd 2; Z =8, D m =1.59, D x =1.57 g cm -3 , Mo K α, λ=0.71069 A,μ=1.43 cm -1 , F (000) = 1168, T =292.5 ± 1 K, R = 0.041,对于 847 (I >2.5σ) 反射,R w = 0.042。阳离子的两个平面环之间的二面角为 39.0°。二硝酸盐的拉曼和红外光谱证实存在相对强的氢键(N + ··O - 距离,2.674 A)并反映与非共面环相关的较低的阳离子对称性(D 2 )。