Nitronyl nitroxide radicals bridged by olefinic spacers display strong intramolecular and antiferromagnetic exchange interactions, the magnitude of which depends on the length of the spacer and on steric crowding around the radicaloid subunits.
                                    由烯烃间隔物桥接的硝基亚硝基显示出很强的分子内和反
铁磁交换相互作用,其大小取决于间隔物的长度和类自由基亚基周围的立体拥挤。