Yanai, HikaruHikaruYanaiSuzuki, TakumiTakumiSuzukiKleemiss, FlorianFlorianKleemiss0000-0002-3631-1535Fukaya, HaruhikoHaruhikoFukayaDobashi, YasuoYasuoDobashiMalaspina, LorraineLorraineMalaspina0000-0002-8281-4264Grabowsky, SimonSimonGrabowsky0000-0002-3377-9474Matsumoto, TakashiTakashiMatsumoto2024-10-282024-10-282019https://boris-portal.unibe.ch/handle/20.500.12422/1856931,1‐Diamino‐2,2‐bis(triflyl)ethylenes with both twisted and planar structures around the partial “C=C” bond were synthesised. Bonding properties in these compounds were analysed by an experimental approach using high‐resolution X‐ray diffraction data treated with X‐ray wavefunction refinement (XWR). In the twisted compound, a dominant contribution of the charge‐separated resonance structure was revealed. On the contrary, the nearly planar compound still showed π‐bonding character, however, with a considerable contribution of the charge‐separated resonance structure.en500 - Science::570 - Life sciences; biology500 - Science::540 - Chemistryarticle10.7892/boris.13838810.1002/anie.201904176