Correlating photoacidity to hydrogen-bond structure by using the local O-H stretching probe in hydrogen-bonded complexes of aromatic alcohols.

Correlating photoacidity to hydrogen-bond structure by using the local O-H stretching probe in hydrogen-bonded complexes of aromatic alcohols.
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通过使用芳香醇氢键配合物中的局部 O-H 伸缩探针将光致酸性与氢键结构相关联

DOI:
10.1021/acs.jpca.5b01530
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发表时间:
2015
期刊:
The journal of physical chemistry. A
影响因子:
--
通讯作者:
V. S. Batista
V. S. Batista
中科院分区:
--
文献类型:
--
作者:
B. T. Psciuk;M. Prémont-Schwarz;B. Koeppe;S. Keinan;D. Xiao;E. T. J. Nibbering;V. S. Batista

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为了评估芳香醇的 O-H 伸缩模式作为瞬态结构和光酸度的超快局部探针的潜在用途,我们分析了 UV 光激发后 2-萘酚-乙腈 (2N-CH3CN) 1:1 复合物中 O-H 伸缩模式的响应。我们将飞秒紫外-红外泵浦探针光谱与基于普林微扰方法的振动溶剂化变色效应的理论处理相结合,并在密度泛函理论(DFT)水平上进行参数化。我们分析了氢键对 S0 状态下光酸碱配合物振动特性的影响,并与覆盖 3000-3650 cm-1 频率范围的各种取代苯酚和萘酚中的 O-H 伸缩振动进行比较。分析了这些具有不同取代基官能团的酚和萘酚在不同极性溶剂中的基态振动特性,并与由紫外光激发引起的 2N 到 1Lb 电子激发态的振动频移进行了比较。我们发现O-H伸缩频移与溶剂极性函数F0=(2ε0-2)/(2ε0+1)呈线性关系,其中ε0是溶剂的静态介电常数。这些变化与由报道的 pKa 值确定的光致酸性趋势以及由氢键配合物的溶剂化或光激发引起的 O·N 和 O-H 氢键距离的结构变化直接相关。
To assess the potential use of O–H stretching modes of aromatic alcohols as ultrafast local probes of transient structures and photoacidity, we analyze the response of the O–H stretching mode in the 2-naphthol-acetonitrile (2N–CH3CN) 1:1 complex after UV photoexcitation. We combine femtosecond UV-infrared pump–probe spectroscopy and a theoretical treatment of vibrational solvatochromic effects based on the Pullin perturbative approach, parametrized at the density functional theory (DFT) level. We analyze the effect of hydrogen bonding on the vibrational properties of the photoacid–base complex in the S0state, as compared to O–H stretching vibrations in a wide range of substituted phenols and naphthols covering the 3000–3650 cm–1frequency range. Ground state vibrational properties of these phenols and naphthols with various substituent functional groups are analyzed in solvents of different polarity and compared to the vibrational frequency shift of 2N induced by UV photoexcitation to the1Lbelectronic excited state. We find that the O–H stretching frequency shifts follow a linear relationship with the solvent polarity functionF0= (2ε0– 2)/(2ε0+ 1), where ε0is the static dielectric constant of the solvent. These changes are directly correlated with photoacidity trends determined by reported pKavalues and with structural changes in the O···N and O–H hydrogen-bond distances induced by solvation or photoexcitation of the hydrogen-bonded complexes.
1-萘酚-3,6-二磺酸酯和几种5-取代1-萘酚衍生物的超快激发态质子转移反应
DOI: 10.1021/jp308746x
发表时间: 2013
期刊: The journal of physical chemistry. B
影响因子: --
作者:
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