Before proceeding towards di-and tri-radicals, we start our study from the investigation of spin-polarized electron transport properties of Blatter's mono-radical connected between two gold electrodes using thiol linker group. The basic structure of Blatter's radical and the spin density distribution (shown in Figure and Figure ) reveals that along with triazinyl ring A containing three N-atoms, majority of unpaired spin also delocalizes on ring B, small delocalization tails of the unpaired electron resides on ring C, while ring D is completely spin isolated. Thus, evidencing electronically distinct nature of the three aromatic rings i.e. The symmetric resonances, also known as the Breit-Wigner reso-nance, can be fitted using a single level model with