Reinvestigation of the molecular structure of gaseousp‐benzoquinone by electron diffraction

摘要: The molecular structure of gaseous p‐benzoquinone has been studied by electron diffraction at a nozzle‐tip temperature 110–125°C. molecule D2h symmetry to within experimental error. results for the more important distance (ra), bond angle, and rms amplitude (l) parameters are rC–H=1.089 A (0.011), rC=O=1.225 A (0.002), rC=C=1.344 A (0.003), rC–C=1.481 A (0.002), ∠C2C1C6=118.1° (0.3), ∠C3C2H=121.4° (assumed), lC–H=0.077 A (assumed), lC=O=0.0424 A (0.0020), lC=C=0.0446 A (0.0024), lC–C=0.0546 A (0.0024). These values in good agreement with those found an early electron‐diffraction study Swingle, except length carbon‐carbon double bond, excellent crystal Trotter.