Synthesis and structure of a novel mesomeric betaine 6,7-dimethyl-2H-pyrazolo[4,3-e]tetrazolo[4,5-b][1,2,4]triazine
作者:Zbigniew Karczmarzyk、Mariusz Mojzych、Andrzej Rykowski
DOI:10.1016/j.molstruc.2006.06.003
日期:2007.3
561 gcm−3, λ(Cu Kα) = 1.54178 A, μ = 0.953 mm−1 and final R = 0.0378 for 1526 reflections. The molecule as a whole has an almost planar conformation and the bond lengths and angles have the values characteristic for π-electron system. The molecular packing in the crystal is influenced by the van der Waals forces and presence of weak π–π interactions. The electronic properties (net charge and MEP distributions
摘要 通过 1H NMR、HRMS、元素分析和 X 射线晶体学合成和结构表征了一种新型内消旋甜菜碱,6,7-二甲基-2H-吡唑并[4,3-e]四唑并[4,5-b][描述了 1,2,4]三嗪 8a。化合物8a在空间群P21/n的单斜晶系中结晶,a = 11.766(2), b = 5.8097(12), c = 12.389(3) A, β = 107.14(3)°, V = 809.2( 3) A3, Z = 4, Dcalc = 1.561 gcm−3, λ(Cu Kα) = 1.54178 A, μ = 0.953 mm−1 并且最终 R = 0.0378(对于 1526 次反射)。整个分子具有几乎平面的构象,键长和键角具有 π 电子系统的特征值。晶体中的分子堆积受范德华力和弱 π-π 相互作用的影响。使用 AM1 近似计算分子 8a 的电子特性(净电荷和 MEP 分布和偶极矩)。介绍了分子