Excited State Intramolecular Proton Transfer (ESIPT) from Phenol to Carbon in Selected Phenylnaphthols and Naphthylphenols
作者:Nikola Basarić、Nađa Došlić、Jakov Ivković、Yu-Hsuan Wang、Jelena Veljković、Kata Mlinarić-Majerski、Peter Wan
DOI:10.1021/jo301456y
日期:2013.3.1
naphthyl phenols 5–8 were investigated by preparative photolyses in CH3CN–D2O, fluorescence spectroscopy, LFP, and ab initio calculations. ESIPT takes place only in 5 (D-exchange Φ = 0.3), whereas 6–8 undergo solvent-assisted PT with much lower efficiencies. The efficiency of the ESIPT and solvent-assisted PT is mainly determined by different populations of the reactive conformers in the ground state and
ESIPT和溶剂辅助在同分异构体的苯基萘酚和萘酚ESPT 5 - 8通过在CH制备photolyses进行了研究3 CN-d 2 O,荧光光谱法,LFP,和从头计算。ESIPT只需代替5(d交换Φ= 0.3),而6 - 8经历溶剂辅助PT具有低得多的效率。ESIPT和溶剂辅助PT的效率主要取决于基态和NEER原理下反应性构象异构体的数量。使用RI-CC2 / cc-pVDZ进行的D交换实验和计算表明,S 1中有5个通过将ESIPT从OH通过与S 0的圆锥形相交直接钝化到萘位置1,从而激活了被LFP检测到的QM 14(τ= 26±3 ns)。ESIPT可能会排在5位中的第3位,但它是从人口稀少的构象者开始的,并且在S 1上包含了一个势垒。在溶剂辅助PT萘位置4 5,两性离子17被形成,其环化成稳定naphthofuran光化产物9 - 12。在溶剂辅助PT的氘化的区域化学是采用对应的酚盐的NBO电荷相关/