图4. (a) CoTPP(py)在6 K下的X波段EPR实验谱图和相应的模拟谱，参数参考文献^[16].“Co”表示仅仅模拟源自Co²⁺（I=7/2）的超精细分裂；“Co+¹⁴N”表示模拟源自Co²⁺（I=7/2）和配体¹⁴N（I=1）的超精细分裂，¹⁴N配位后会造成谱图进一步发生超精细分裂而模糊化，如“Exp”实验谱所示.(b)~(d)分别是CoTPP(py)的X波段Mims-ENDOR、Davies-ENDOR和三脉冲ESEEM谱.(c)中的红线是模拟源自未成对电子与吡啶配体氮原子的相互作用（强耦合），蓝线是模拟源自未成对电子与卟啉配体氮原子的相互作用（弱耦合）

Fig.4. (a) The X-band EPR spectra of CoTPP(py) at 6 K and the corresponding simulations; "Co" represents the simulation spectrum resulting from hyperfine splitting of Co²⁺ ion (I=7/2); "Co + ¹⁴N" represents the simulation spectrum resulting from hyperfine splitting of Co²⁺ ion (I=7/2) and ¹⁴N (I=1). The coordination of Co²⁺ ion with nitrogen atoms leads to further hyperfine splitting and blurry spectrum, as shown in the spectrum "Exp". (b)~(d) represent X-band Mims-ENDOR spectrum, Davies-ENDOR spectrum, and three-pulsed ESEEM spectrum, respectively. Red line in (c) represents the simulation spectrum resulting from interaction with the nitrogen of pyridine ligand (strong coupling), blue line represents the simulation spectrum resulting from interaction with the nitrogen atoms of porphyrin ligand (weak coupling)