Dvornikov S S, Solov'ev K N, Tsvirko M P
Biofizika. 1979 Sep-Oct;24(5):791-6.
It has been shown by investigations of polarization spectra and the dependence of the degree of fluorescence and phosphorescence polarization on emission wavelength that in non-polar solvents at 77 degrees K the molecules of Mg porphin and Mg tetraphenylporphin possess true symmetry D4h. When polar molecules (water, alcohols, pyridine) are present in the solution further complexing of the magnesium complexes with extra-ligands takes place and the polarization data indicate that D4h symmetry is absent which leads to splitting of the doubly degenerate states by 100-150 cm-1. It has been established that on further complexing the S1 and T1 levels are lowered by approximately 500 and 700 cm-1, respectively, the probability of intercombinational degradation T1 leads to S0 increases in this case. It follows from the data obtained that the extra-ligands do not essentially influence spin-orbit interaction.
通过对偏振光谱以及荧光和磷光偏振度与发射波长的相关性研究表明，在77K的非极性溶剂中，镁卟啉和镁四苯基卟啉分子具有真正的D4h对称性。当溶液中存在极性分子（水、醇、吡啶）时，镁配合物会与额外配体进一步发生络合作用，偏振数据表明不存在D4h对称性，这导致双重简并态分裂100 - 150 cm-1。已经确定，在进一步络合时，S1和T1能级分别降低约500和700 cm-1，在这种情况下，T1向S0的组合间降解概率增加。从获得的数据可以看出，额外配体对自旋 - 轨道相互作用没有实质性影响。
