Two-electron oxidations of three 1,2-di（bisphenylamino）-benzenes afforded a class of nitrogen analogues of o-quinodimethane. Their elec-tronic structures in the ground state were studied by spectroscopic techniques ...Two-electron oxidations of three 1,2-di（bisphenylamino）-benzenes afforded a class of nitrogen analogues of o-quinodimethane. Their elec-tronic structures in the ground state were studied by spectroscopic techniques including EPR and UV-vis absorption spectroscopy. They have open-shell singlet ground states with thermally accessible triplet states. One of them （12＋2） has been crystalized and isolated. SQUID measurements, single crystal X-ray diffraction and theoretical calculat ons show I has unexpected non-Kekule diradical character, sharply different from o-quinodirnethane.展开更多
文摘Two-electron oxidations of three 1,2-di（bisphenylamino）-benzenes afforded a class of nitrogen analogues of o-quinodimethane. Their elec-tronic structures in the ground state were studied by spectroscopic techniques including EPR and UV-vis absorption spectroscopy. They have open-shell singlet ground states with thermally accessible triplet states. One of them （12＋2） has been crystalized and isolated. SQUID measurements, single crystal X-ray diffraction and theoretical calculat ons show I has unexpected non-Kekule diradical character, sharply different from o-quinodirnethane.
