Novel excited quintet state in porphyrin: bis(quinoline-TEMPO)-yttrium-tetraphenylporphine complex.
Novel excited quintet state in porphyrin: bis(quinoline-TEMPO)-yttrium-tetraphenylporphine complex.
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DOI：
10.1021/ic0511827
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发表时间：
2005-11
影响因子：
4.6
通讯作者：
L. Maretti;S. Islam;Y. Ohba;T. Kajiwara;S. Yamauchi
中科院分区：
文献类型：
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作者：
L. Maretti;S. Islam;Y. Ohba;T. Kajiwara;S. Yamauchi
合成了新的单核和bis[4-(3-hydroxy-2-methyl-4-quinolinoyloxy)-2，2，6，6-tetramethylpiperidin-1-oxyl](meso-tetraphenylporphyrinato)yttrium(III)配合物，并用时间分辨和脉冲二维电子顺磁共振光谱研究了卟啉的光激发激发态性质。在一个或两个自由基与卟啉的光激发三重态相互作用所产生的四重态(S=3/2)或五重态(S=2)中观察到了一条tr-EPR谱。根据三重态和自由基三重态的零场分裂D值，分析了这些态的零场分裂D值。用脉冲电子顺磁共振测量突变频率，确定了激发态的自旋态。
New mono- and bis[4-(3-hydroxy-2-methyl-4-quinolinoyloxy)-2,2,6,6-tetramethylpiperidin-1-oxyl](meso-tetraphenylporphyrinato)yttrium(III) complexes have been synthesized, and the properties of the excited states generated by photoexcitation of porphyrin were studied by time-resolved (TR) and pulsed two-dimensional electron paramagnetic resonance (EPR) spectroscopy. A TR-EPR spectrum was observed in the quartet (S=3/2) or quintet (S=2) states generated from interactions of one or two radicals with the photoexcited triplet state of the porphyrin. The zero-field splitting D values of these states were analyzed in terms of those of the triplet and the radical-triplet pair. The spin states of the excited states were definitely assigned by measuring the mutation frequencies with pulsed EPR.