电荷转移增强了过渡金属卟啉中的双光子吸收。
Charge transfer enhances two-photon absorption in transition metal porphyrins.
作者信息
Humphrey Jonathan L, Kuciauskas Darius
机构信息
Department of Chemistry, Virginia Commonwealth University, 1001 West Main Street, Richmond, Virginia 23284-2006, USA.
出版信息
J Am Chem Soc. 2006 Mar 29;128(12):3902-3. doi: 10.1021/ja0588353.
Two-photon absorption processes were investigated in electropolymerized Fe(III), Mn(III), and Co(II) 5,10,15,20-tetrakis-(4-hydroxytetraphenyl)porphyrin films. Degenerate four wave mixing (DFWM) spectroscopy with 100 fs pulses in the near-IR spectral region was used. Metalloporphyrins with strong charge transfer (CT) transitions in the linear absorption spectra also show enhanced two-photon absorption. (Metalloporphyrin two-photon absorption cross section, delta, increases >10 times over that for the metal free porphyrin.) This effect was attributed to a two-photon induced charge transfer between the metal ion's d orbitals and the pi-system of the porphyrin. Correlation of one- and two-photon absorption properties of transition metal porphyrins suggests a new and simple approach to improve organic materials for photonic applications.
在电聚合的铁（III）、锰（III）和钴（II）5,10,15,20-四（4-羟基四苯基）卟啉薄膜中研究了双光子吸收过程。使用了在近红外光谱区域具有100飞秒脉冲的简并四波混频（DFWM）光谱。在线性吸收光谱中具有强电荷转移（CT）跃迁的金属卟啉也显示出增强的双光子吸收。（金属卟啉的双光子吸收截面δ比无金属卟啉增加了10倍以上。）这种效应归因于金属离子的d轨道与卟啉的π体系之间的双光子诱导电荷转移。过渡金属卟啉的单光子和双光子吸收特性的相关性为改善用于光子应用的有机材料提供了一种新的简单方法。
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