Mechanism of the chiral SHG activity of bacteriorhodopsin films.
Mechanism of the chiral SHG activity of bacteriorhodopsin films.
复制标题
细菌视紫红质膜的手性SHG活性机制。
DOI：
10.1021/ja062671o
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发表时间：
2006
影响因子：
15
通讯作者：
Simpson,GarthJ
中科院分区：
文献类型：
--
作者：
Wampler,RonaldD;Zhou,Mingkang;Thompson,DavidH;Simpson,GarthJ
对细菌视紫红质（bR）LB膜的非线性光学性质进行了理论计算和实验研究。二次谐波产生的光学旋转色散（SHG-ORD）的响应直接计算从已知的结构和取向的PSB视网膜生色团在bR没有可调的参数。预测结果与实验SHG-ORD测量结果在符号、幅度和趋势上吻合得非常好。计算结果表明，PSB视网膜生色团的张量的手性可以忽略不计，但通过一个相对简单的取向机制的薄膜显着的手性特定的活动。
The nonlinear optical activity of bacteriorhodopsin (bR) Langmuir−Blodgett (LB) films were investigated computationally and experimentally. The second harmonic generation optical rotary dispersion (SHG-ORD) response was calculated directly from the known structure and orientation of the PSB retinal chromophore within bR with no adjustable parameters. The predicted results agree remarkably well in sign, magnitude, and trend with the experimental SHG-ORD measurements. The calculations indicated negligible chirality with the tensor for the PSB retinal chromophore, but significant chiral-specific activity for the thin film through a relatively simple orientational mechanism.