Photoexcited organic chromophores appended to stable radicals can serve as qubit and/or qudit candidates for quantum information applications. 1,6,7,12-Tetra-(4-tert-butylphenoxy)-perylene-3,4 : 9,10-bis(dicarboximide) (tpPDI) linked to a partially deuterated α,γ-bisdiphenylene-β-phenylallyl radical (BDPA-d<sub>16</sub> ) was synthesized and characterized by time-resolved optical and electron paramagnetic resonance (EPR) spectroscopies. Photoexcitation of tpPDI-BDPA-d<sub>16</sub> results in ultrafast radical-enhanced intersystem crossing to produce a quartet state (Q) followed by formation of a spin-polarized doublet ground state (D<sub>0</sub> ). Pulse-EPR experiments confirmed the spin multiplicity of Q and yielded coherence times of T<sub>m</sub> =2.1±0.1 μs and 2.8±0.2 μs for Q and D<sub>0</sub> , respectively. BDPA-d<sub>16</sub> eliminates the dominant <sup>1</sup> H hyperfine couplings, resulting in a single narrow line for both the Q and D<sub>0</sub> states, which enhances the spectral resolution needed for good qubit addressability.