Electron withdrawing groups can enhance the limiting effect for this kind of complexes, but the effect of heavy atom ACTS opposite role.
吸电子基团能增强该类配合物对皮秒激光的限幅效果，而重原子效应则起相反的作用。
Raman spectroscopy results showed that: the presence of electron withdrawing groups improved the bond energy of C-H in the benzene ring.
拉曼光谱分析结果证明：吸电子基团的存在使苯环上c - H的键能提高。
In the present paper, a series of xanthene-2-carboxylic acids and xanthone-2-carboxylic acids with electron withdrawing groups on the 7-position had been synthesized.
本文合成了一系列7位拉电子基团取代的氧杂蒽-2-羧酸及氧杂蒽酮-2-羧酸化合物。
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